· Welcome ·

On this page you'll find information about my previous and on-going research, a CV, and my contact information. Please enjoy!

I completed my Ph.D. work at Harvard University in 2014 with Lars Hernquist studying galaxy formation. I am now a Hubble Fellow at MIT studying how feedback shapes galaxy properties as they evolve. I am a core member of the Illustris collaboration and I work on a wide array of topics under the umbrella of galaxy formation. For more detailed bio information, including a description of my past and current research and an updated CV, please see my "Research" page.



I did my undergrad at Cornell University, where I received a B.S. in Applied and Engineering Physics in 2008. Most of my work during that time had an engineering focus. I worked on the mechanical design team and the navigation subsystems team for CUSat: the winner for the Air Force NanoSat4 competition. I spent a summer working as a Space Grant summer intern with Lee Johnson at JPL on advanced propulsion systems. During my senior year, I worked with Joe Burns and Matt Tiscareno on image analysis from the Cassini spacecraft. I studied the structure of the Enke and Keeler gaps in Saturn's rings -- characterizing the wavy patterns in their edges.

I did my grad work at Harvard University under the supervision of Lars Hernquist. I studied galaxy formation using numerical simulations. My thesis work involved running and analyzing some of the first cosmological simulations using the new simulation code AREPO. My first AREPO related project was to understand the impact of the new hydro solver included in AREPO on the properties of galactic gas disks that formed in cosmological simulations. After that, I explored a number of galaxy relations (stellar mass function, star formation main sequence, mass-metallicity relation, etc.) as a function of redshift in our AREPO simulations with stellar and AGN feedback included. That work culminated in the running of the Illustris simulation.

During grad school I began working on understanding the heavy element distribution in galaxies. Heavy elements serve as tracers of gas flows, and are known to be being rapidly redistributed in merging/interacting galaxies. I worked with Lisa Kewley on the metallicity evolution of interacting galaxies by applying idealized galaxy merger simulations to build theoretical expectations for the nuclear metallicity and metallicity gradient evolution. I continued this work with Sara Ellison and Dave Patton by comparing our idealized merger models against observations of enhanced star formation rates and depressed nuclear metallicities as seen through the Sloan Digital Sky Survey. Using heavy elements as a probe of galaxy formation remains one of my main scientific interests.

I am now a Hubble Fellow at MIT. The primary focus of my research is on the IllustrisTNG project, understanding the role the feedback plays in shaping galaxy populations, and detailed modeling of quasar feedback.

Cosmological Image Pipeline

I produced a catalog of 7,000 synthetic images and 40,000 integrated spectra of redshift z=0 galaxies from the Illustris Simulation that can be used for a wide range of science topics. The mock data products are produced by using stellar population synthesis models to assign spectral energy distributions (SEDs) to each star particle in the galaxies. The resulting synthetic images and integrated SEDs therefore properly reflect the spatial distribution, stellar metallicity distribution, and star formation history of the galaxies. From the synthetic data products it is possible to produce monochromatic or color-composite images, perform SED fitting, classify morphology, determine galaxy structural properties, and evaluate the impacts of galaxy viewing angle. In our paper on this topic we derived galactic stellar mass estimates by applying the SED fitting code FAST to the synthetic galaxy products, and compared the derived stellar masses against the true stellar masses from the simulation. We found that systematic biases exist in the photometrically derived stellar mass values that can be reduced by using a fixed metallicity in conjunction with a minimum galaxy age restriction.

Galaxy Number Density Evolution

A simple python module for calculating the cumulative stellar mass function and non-constant cumulative number density evolution of galaxy populations can be downloaded here.

Galaxy comoving number-density is commonly used to link galaxy populations across different epochs in order to infer galaxy evolution properties. By assuming galaxy populations preserve their number-density in time, one can infer the mass, size, and morphological evolution of galaxies. However, galaxies will not preserve their number-density in the presence of galaxy mergers or when their rank ordering is broken owing to variable growth rates. I analyzed the evolving comoving number-density of galaxy populations found in the Illustris simulation and found that 1) Inferring stellar mass evolution via constant comoving number-density selection gives qualitatively correct results, but introduces systematic errors at the factor of 3-5 level; 2) An evolution in the median number-density of tracked galaxy populations is observed regardless of whether number-density is assigned via stellar mass or velocity dispersion; 3) The median evolution in the number-density of tracked galaxy populations is driven by both galaxy mergers and galaxy rank reordering; and 4) The significant scatter in galaxy linking methods can only be marginally reduced by using multiple galaxy properties. We provide fits for the median non-constant comoving number-density tracks that galaxies follow in time (can be downloaded here) and encourage their use when interpreting observational data.


A selection of some talks which have been recorded.

Thesis Introduction

Here I'm giving a fairly general introduction to the work that went into my thesis. This is mostly eared at non-astronomers, but introduces the numerical methods that we use and general goals of my thesis work.

Feedback in AREPO

Here I describe the feedback modules that we implemented into AREPO to regulate the stellar mass growth of galaxies. I describe the feedback modules themselves, as well some evolving galaxy scaling relations and how they compare against observations.

Illustris Simulation Observatory

Here I describe the "Illustris Simulation Observatory": a catalog of mock images and spectra that I generated directly from the Illustris simulation output. One interesting result is how well stellar masses can be recovered from the mock spectra that we generate.


  • A copy of my current CV -- including a paper list -- as of 11/1/2017 can be found here.
  • My ADS paper listings can be found here (or sorted by citations here).
  • A PDF copy of my Ph.D. thesis can be found here. And, for those who are interested (mostly Harvard grad students), the source code used to compile this thesis can be found here.

First Author Papers

  1. "The evolution of the Mass-Metallicity relation in IllustrisTNG"
    Torrey, Vogelsberger, Marinacci, Pakmor, Springel, Nelson, Naiman, Pillepich, Genel, Weinberger, & Hernquist arXiv:1711.05261 (submitted to MNRAS)
    [ ADS ] [ arXiv ]

  2. "Similar evolution timescales for star formation rates and metallicity drive the fundamental metallicity relation"
    Torrey Vogelsberger, Marinacci, Pakmor, Springel, Nelson, Naiman, Pillepich, Genel, Weinberger, & Hernquist (submitted to MNRAS)

  3. "Forward and Backward galaxy evolution in comoving number density space"
    Torrey, Wellons, Ma, Hopkins, & Vogelsberger, MNRAS, 467, 4872, 2017
    [ ADS ] [ arXiv ]

  4. "An instability of feedback regulated star formation in galactic nuclei"
    Torrey, Hopkins, Faucher-Giguere, Vogelsberger, Quataert, Keres, & Murray, MNRAS, 467, 2301, 2017
    [ ADS ] [ arXiv ]

  5. "An analysis of the evolving comoving number density of galaxies in hydrodynamical simulations"
    Torrey, Wellons, Machado, Griffen, Nelson, Rodriguez-Gomez, McKinnon, Pillepich, Ma, Vogelsberger, Springel, & Hernquist, MNRAS, 454, 2770, 2015
    [ ADS ] [ arXiv ]

  6. “Synthetic galaxy images and spectra from the Illustris simulation”
    Torrey, Snyder, Vogelsberger, Hayward, Genel, Sijacki, Springel, Hernquist, Nelson, Kriek, Pillepich, Sales, & McBride, MNRAS., 447, 2753, 2015
    [ ADS ] [ arXiv ]

  7. “A physical model for cosmological simulations of galaxy formation: multi-epoch model validation”
    Torrey, Vogelsberger, Genel, Sijacki, Springel, & Hernquist, MNRAS., 438, 1985, 2014
    [ ADS ] [ arXiv ]

  8. “Moving Mesh Cosmology: The properties of gas disks”
    Torrey, Vogelsberger, Sijacki, Springel, & Hernquist, , MNRAS., 427, 2224, 2012
    [ ADS ] [ arXiv ]

  9. “The Metallicity Evolution of Interacting Galaxies”
    Torrey, Cox, Kewley, & Hernquist, ApJ., 746, 102, 2012
    [ ADS ] [ arXiv ]

  10. Second Author Papers

  11. "Galaxies in the Illustris simulation as seen by the Sloan Digital Sky Survey - II. Size-luminosity relations and the deficit of bulge-dominated galaxies in Illustris at low mass."
    Bottrell, Torrey, Simard & Ellison, MNRAS 467, 2879, 2017
    [ ADS ] [ arXiv ]

  12. "Galaxies in the Illustris simulation as seen by the Sloan Digital Sky Survey - I: Bulge+disc decompositions, methods, and biases."
    Bottrell, Torrey, Simard & Ellison, MNRAS 467, 1033, 2017
    [ ADS ] [ arXiv ]

  13. "Dust Formation in Milky Way-like Galaxies"
    McKinnon, Torrey, & Vogelsberger, MNRAS 457, 3775, 2016
    [ ADS ] [ arXiv ]

  14. "Simulating the dust content of galaxies: successes and failures"
    McKinnon, Torrey, Vogelsberger, Hayward, & Marinacci, MNRAS 468, 1505, 2017
    [ ADS ] [ arXiv ]

  15. "Stellar and Quasar Feedback in Concert: Effects on AGN Accretion, Obscuration, and Outflows"
    Hopkins, Torrey, Faucher-Giguere, Quataert, & Murray, MNRAS, 458, 816, 2016
    [ ADS ] [ arXiv ]

  16. "Galaxy morphology and star formation in the Illustris Simulation at z=0"
    Snyder, Torrey, Lotz, Genel, McBride, Vogelsberger, Pillepich, Nelson, Sales, Sijacki, Hernquist, & Springel, MNRAS, 454, 1886, 2015
    [ ADS ] [ arXiv ]

  17. "On the cosmic evolution of Fe/Mg in QSO absorption line systems"
    Dey, Torrey, Rubin, Zhu, & Suresh, MNRAS, 451, 1806, 2015
    [ ADS ] [ arXiv ]

  18. "The diverse evolutionary paths of simulated high-z massive, compact galaxies to z=0"
    Wellons, Torrey, Ma, Rodriguez-Gomez, Pillepich, Nelson, Genel, Vogelsberger, & Hernquist, MNRAS, 456, 1030, 2015
    [ ADS ] [ arXiv ]

  19. "An improved probabilistic approach for linking progenitor and descendant galaxy populations using comoving number density"
    Wellons & Torrey, MNRAS, 467, 3887, 2017
    [ ADS ] [ arXiv ]

  20. "The formation of massive, compact galaxies at z = 2 in the Illustris simulation"
    Wellons, Torrey, Ma, Rodriguez-Gomez, Vogelsberger, Kriek, van Dokkum, Nelson, Genel, Pillepich, Springel, Sijacki, Snyder, Nelson, Sales, & Hernquist, MNRAS, 449, 361, 2015
    [ ADS ] [ arXiv ]

  21. "Mapping galaxy encounters in numerical simulations: the spatial extent of induced star formation"
    Moreno, Torrey, Ellison, Patton, Bluck, Bansal, & Hernquist, MNRAS, 448, 1107, 2015
    [ ADS ] [ arXiv ]

  22. “Galaxy mergers on a moving mesh: a comparison with smoothed-particle hydrodynamics”
    Hayward, Torrey, Springel, Hernquist, & Vogelsberger, MNRAS., 422, 1992, 2014
    [ ADS ] [ arXiv ]

  23. “Emperical Constraints for the Magnitude and Composition of Galactic Winds”
    Zahid, Torrey, Vogelsberger, Hernquist, Kewley, & Dave, Ap&SS, 349, 873, 2013
    [ ADS ] [ arXiv ]

  24. “The Slow Flow Model of Dust Efflux in Local Star-Forming Galaxies”
    Zahid, Torrey, Kudritzki, Kewley, Dave,& Geller, MNRAS., 436, 1852, 2013
    [ ADS ] [ arXiv ]

  25. “Galaxy pairs in the Sloan Digital Sky Survey – VI. The orbital extent of enhanced star formation in interacting galaxies”
    Patton, Torrey, Ellison, Mendel, & Scudder, MNRAS., 433, L59, 2013
    [ ADS ] [ arXiv ]

  26. "An Integral Field Study of Abundance Gradients in nearby Luminous Infrared Galaxies”
    Rich, Torrey, Kewley, Dopita, & Rupke, ApJ., 753, 5, 2012
    [ ADS ] [ arXiv ]

  27. Coauthored Papers

  28. "Black holes on FIRE: stellar feedback limits early feeding of galactic nuclei"
    Angles-Alcazar, Faucher-Giguere, Quataert, Hopkins, Feldmann, Torrey, Wetzel, Keres, MNRAS Letter, 472, L109, 2017
    [ ADS ] [ arXiv ]

  29. "A census of cool core galaxy clusters in IllustrisTNG"
    Barnes, Vogelsberger, Kannan, Marinacci, Weinberger, Springel, Torrey, Pillepich, Nelson, Pakmor, Naiman, Hernquist, McDonald, MNRAS (accepted), 2017
    [ ADS ] [ arXiv ]

  30. "Supermassive black holes and their feedback effects in the IllustrisTNG simulation"
    Weinberger, Springel, Pakmor, Nelson, Genel, Pillepich, Vogelsberger, Marinacci, Naiman, Torrey, Hernquist, MNRAS (accepted), 2017
    [ ADS ] [ arXiv ]

  31. "Metal flows of the circumgalactic medium, and the metal budget in galactic haloes"
    Muratov, Keres, Faucher-Giguere, Hopkins, Ma, Angles-Alcazar, Chan, Torrey, Hafen, Quataert, Murray, MNRAS, 468, 4170, 2017
    [ ADS ] [ arXiv ]

  32. "The Size Evolution of Star-forming and Quenched Galaxies in the IllustrisTNG simulation"
    Genel, Nelson, Pillepich, Springel, Pakmor, Weinberger, Hernquist, Naiman, Vogelsberger, Marinacci, Torrey, MNRAS (accepted), 2017
    [ ADS ] [ arXiv ]

  33. "The uniformity and time-invariance of the intra-cluster metal distribution in galaxy clusters from the IllustrisTNG simulations"
    Vogelsberger, Marinacci, Torrey, Genel, Springel, Weinberger, Pakmor, Hernquist, Naiman, Pillepich, Nelson, MNRAS (accepted), 2017
    [ ADS ] [ arXiv ]

  34. "First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies"
    Pillepich, Nelson, Hernquist, Springel, Pakmor, Torrey, Weinberger, Genel, Naiman, Marinacci, Vogelsberger, MNRAS (submitted), 2017
    [ ADS ] [ arXiv ]

  35. "First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium"
    Naiman, Pillepich, Springel, Ramirez-Ruiz, Torrey, Vogelsberger, Pakmor, Nelson, Marinacci, Hernquist, Weinberger, Genel, MNRAS (submitted), 2017
    [ ADS ] [ arXiv ]

  36. "First results from the IllustrisTNG simulations: matter and galaxy clustering"
    Springel, Pakmor, Pillepich, Weinberger, Nelson, Hernquist, Vogelsberger, Genel, Torrey, Marinacci, Naiman, MNRAS (accepted), 2017
    [ ADS ] [ arXiv ]

  37. "First results from the IllustrisTNG simulations: radio haloes and magnetic fields"
    Marinacci, Vogelsberger, Pakmor, Torrey, Springel, Hernquist, Nelson, Weinberger, Pillepich, Naiman, Genel, MNRAS (submitted), 2017
    [ ADS ] [ arXiv ]

  38. "First results from the IllustrisTNG simulations: the galaxy color bimodality"
    Nelson, Pillepich, Springel, Weinberger, Hernquist, Pakmor, Genel, Torrey, Vogelsberger, Kauffmann, Marinacci, Naiman, MNRAS (accepted), 2017
    [ ADS ] [ arXiv ]

  39. "Massive close pairs measure rapid galaxy assembly in mergers at high redshift"
    Snyder, Lotz, Rodriguez-Gomez, Guimarães, Torrey, Hernquist, MNRAS, 468, 207, 2017
    [ ADS ] [ arXiv ]

  40. "The role of mergers and halo spin in shaping galaxy morphology"
    Rodriguez-Gomez, Sales, Genel, Pillepich, Zjupa, Nelson, Griffen, Torrey, Snyder, Vogelsberger, Springel, Ma, Hernquist, MNRAS, 467, 3083, 2017
    [ ADS ] [ arXiv ]

  41. "Why do high-redshift galaxies show diverse gas-phase metallicity gradients?"
    Ma, Hopkins, Feldmann, Torrey, Faucher-Giguere, Keres, MNRAS, 466, 4780, 2017
    [ ADS ] [ arXiv ]

  42. "Log-normal Star Formation Histories in Simulated and Observed Galaxies"
    Diemer, Sparre, Abramson, Torrey, ApJ, 839, 20, 2017
    [ ADS ] [ arXiv ]

  43. "Simulating galaxy formation with black hole driven thermal and kinetic feedback"
    Weinberger, Springel, Hernquist, Pillepich, Marinacci, Pakmor, Nelson, Genel, Vogelsberger, Naiman, Torrey, MNRAS, 465, 3291, 2017
    [ ADS ] [ arXiv ]

  44. "Simulating Galaxy Formation with the IllustrisTNG Model"
    Pillepich, Springel, Nelson, Genel, Naiman, Pakmor, Hernquist, Torrey, Vogelsberger, Weinberger, Marinacci, MNRAS, (submitted) 2017
    [ ADS ] [ arXiv ]

  45. "FIRE-2 Simulations: Physics versus Numerics in Galaxy Formation"
    Hopkins, et al. (28 authors, including Torrey), MNRAS, (submitted) 2017
    [ ADS ] [ arXiv ]

  46. "ALMA Resolves the Nuclear Disks of Arp 220"
    Scoville, et al. (23 authors, including Torrey), ApJ, 836, 18, 2017
    [ ADS ] [ arXiv ]

  47. "About AGN ionization echoes, thermal echoes and ionization deficits in low-redshift Lyα blobs"
    Schirmer, Malhotra, Levenson, Fu, Davies, Keel, Torrey, Bennert, Pancoast, Turner, MNRAS, 436, 1554, 2016
    [ ADS ] [ arXiv ]

  48. "Mg II Absorption at 2
    Chen, Simcoe, Torrey, Banados, Cooksey, Cooper, Furesz, Matejek, Miller, Turner, Venemans, Decarli, Farina, Mazzucchelli, Walter, ApJ (submitted), 2016
    [ ADS ] [ arXiv ]

  49. "The missing satellite problem in 3D"
    Nierenberg, Treu, Menci, Lu, Torrey, Vogelsberger, MNRAS, 462, 4473, 2016
    [ ADS ] [ arXiv ]

  50. "The impact of galactic properties and environment on the quenching of central and satellite galaxies: a comparison between SDSS, Illustris and L-Galaxies"
    Bluck, Mendel, Ellison, Patton, Simard, Henriques, Torrey, Teimoorinia, Moreno, Starkenburg, MNRAS, 462, 2559, 2016
    [ ADS ] [ arXiv ]

  51. "The Mass Profile of the Milky Way to the Virial Radius from the Illustris Simulation"
    Taylor, Boylan-Kolchin, Torrey, Vogelsberger, & Hernquist, MNRAS, 461, 2559, 2016
    [ ADS ] [ arXiv ]

  52. "Galaxy pairs in the Sloan Digital Sky Survey - XI. A new method for measuring the influence of the closest companion out to wide separations"
    Patton, Qamar, Ellison, Bluck, Simard, Mendel, Moreno, Torrey, MNRAS, 461, 2589, 2016
    [ ADS ] [ arXiv ]

  53. "The CALIFA and HIPASS Circular Velocity Function for All Morphological Galaxy Types"
    Bekeraite, Walcher, Wisotzki, Croton, Falcon-Barroso, Lyubenova, Obreschkow, Sanchez, Spekkens, Torrey, van de Ven, Zwaan, Ascasibar, Bland-Hawthorn, González Delgado, Husemann, Marino, Vogelsberger, Ziegler, ApJ, 827, L36, 2016
    [ ADS ] [ arXiv ]

  54. "The stellar mass assembly of galaxies in the Illustris simulation: growth by mergers and the spatial distribution of accreted stars"
    Rodriguez-Gomez, Pillepich, Sales, Genel, Vogelsberger, Zhu, Wellons, Nelson, Torrey, Springel, Ma, & Hernquist, MNRAS, 458, 2371,2016
    [ ADS ] [ arXiv ]

  55. "Large-Scale Mass Distribution in the Illustris-Simulation"
    Haider, Steinhauser, Vogelsberger, Genel, Springel, Torrey, & Hernquist, MNRAS, 457, 3024, 2016
    [ ADS ] [ arXiv ]

  56. "Recoiling black holes: prospects for detection and implications of spin alignment"
    Blecha, Sijacki, Kelley, Torrey, Vogelsberger, Nelson, Springel, Snyder, & Hernquist, MNRAS, 456, 961, 2016
    [ ADS ] [ arXiv ]

  57. "On the assembly of dwarf galaxies in clusters and their efficient formation of globular clusters"
    Mistani, Sales, Pillepich, Sanchez-Janssen, Vogelsberger, Nelson, Rodriguez-Gomez, Torrey, & Hernquist, MNRAS, 455, 2323, 2016
    [ ADS ] [ arXiv ]

  58. "Modelling galactic conformity with the colour-halo age relation in the Illustris simulation"
    Bray, Pillepich, Sales, Zhu, Genel, Rodriguez-Gomez, Torrey, Nelson, Vogelsberger, Springel, Eisenstein, & Hernquist, MNRAS, 455, 185B, 2016
    [ ADS ] [ arXiv ]

  59. "Hydrogen reionization in the Illustris universe"
    Bauer, Springel, Vogelsberger, Genel, Torrey, Sijacki, Nelson, & Hernquist, MNRAS, 453, 3593, 2015
    [ ADS ] [ arXiv ]

  60. "The Illustris simulation: Public data release"
    Nelson, Pillepich, Genel, Vogelsberger, Springel, Torrey, Rodriguez-Gomez, Sijacki, Snyder, Griffen, Marinacci, Blecha, Sales, Xu, & Hernquist, A&C, 13, 12, 2015
    [ ADS ] [ arXiv ]

  61. "The Incidence of Low-metallicity Lyman-limit Systems at z~3.5: Implications for the Cold-flow Hypothesis of Baryonic Accretion"
    Cooper, Simcoe, Cooksey, O’Meara, Torrey, ApJ, 812, 58, 2015
    [ ADS ] [ arXiv ]

  62. "The Illustris simulation: the evolving population of black holes across cosmic time"
    Sijacki, Vogelsberger, Genel, Springel, Torrey, Snyder, Nelson, & Hernquist, MNRAS, 452, 575, 2015
    [ ADS ] [ arXiv ]

  63. "Galaxy pairs in the Sloan Digital Sky Survey - X. Does gas content alter star formation rate enhancement in galaxy interactions?"
    Scudder, Ellison, Momjian, Rosenberg, Torrey, Patton, Fertig, & Mendel, MNRAS, 449, 3719, 2015
    [ ADS ] [ arXiv ]

  64. "The merger rate of galaxies in the Illustris simulation: a comparison with observations and semi-empirical models"
    Rodriguez-Gomez, Genel, Vogelsberger, Sijacki, Pillepich, Sales, Torrey, Snyder, Nelson, Springel, Ma, & Hernquist, MNRAS, 449, 49, 2015
    [ ADS ] [ arXiv ]

  65. "Hot Gaseous Coronae around Spiral Galaxies: Probing the Illustris Simulation"
    Bogdán, Vogelsberger, Kraft, Hernquist, Gilfanov, Torrey, Churazov, Genel, Forman, Murray, Vikhlinin, Jones, & Böhringer, ApJ, 804, 72, 2015
    [ ADS ] [ arXiv ]

  66. "The impact of galactic feedback on the circumgalactic medium"
    Suresh, Bird, Vogelsberger, Genel, Torrey, Sijacki, Springel, & Hernquist, MNRAS, 448, 895, 2015
    [ ADS ] [ arXiv ]

  67. "The neutral gas content of post-merger galaxies"
    Ellison, Fertig, Rosenberg, Nair, Simard, Torrey, & Patton, MNRAS, 448, 221, 2015
    [ ADS ] [ arXiv ]

  68. "The impact of feedback on cosmological gas accretion"
    Nelson, Genel, Vogelsberger, Springel, Sijacki, Torrey, & Hernquist, MNRAS, 448, 59, 2015
    [ ADS ] [ arXiv ]

  69. "The star formation main sequence and stellar mass assembly of galaxies in the Illustris simulation"
    Sparre, Hayward, Springel, Vogelsberger, Genel, Torrey, Nelson, Sijacki, & Hernquist, MNRAS, 447, 3548, 2015
    [ ADS ] [ arXiv ]

  70. "The colours of satellite galaxies in the Illustris simulation"
    Sales, Vogelsberger, Genel, Torrey, Nelson, Rodriguez-Gomez, Wang, Pillepich, Sijacki, Springel, & Hernquist, MNRAS, 447L, 6, 2015
    [ ADS ] [ arXiv ]

  71. "Damped Lyman α absorbers as a probe of stellar feedback"
    Bird, Vogelsberger, Haehnelt, Sijacki, Genel, Torrey, Springel, & Hernquist, MNRAS, 445, 2313, 2015
    [ ADS ] [ arXiv ]

  72. "Introducing the Illustris project: the evolution of galaxy populations across cosmic time"
    Genel, Vogelsberger, Springel, Sijacki, Nelson, Snyder, Rodriguez-Gomez, Torrey, & Hernquist, MNRAS, 445, 175, 2014
    [ ADS ] [ arXiv ]

  73. “Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe”
    Vogelsberger, Genel, Springel, Torrey, Sijacki, Xu, Snyder, Bird, Nelson & Hernquist, MNRAS, 444, 1518, 2014
    [ ADS ] [ arXiv ]

  74. “Halo assembly exposed in the faint outskirts: the stellar and dark matter haloes of Illustris galaxies”
    Pillepich, Vogelsberger, Deason, Rodriguez-Gomez, Genel, Nelson, Torrey, Sales, Marinacci, Springel, Sijacki, & Hernquist, MNRAS, 444, 237, 2014
    [ ADS ] [ arXiv ]

  75. “Properties of galaxies reproduced by hydrodynamic simulations”
    Vogelsberger, Genel, Springel, Torrey, Sijacki, Xu, Snyder, Bird, Nelson & Hernquist, Nature., 507, 177, 2014
    [ ADS ] [ arXiv ]

  76. “A physical model for cosmological simulations of galaxy formation”
    Vogelsberger, Genel, Sijacki, Torrey, Springel, & Hernquist, MNRAS., 436, 3031, 2013
    [ ADS ] [ arXiv ]

  77. “The Dynamics of Galaxy Pairs in a Cosmological Setting”
    Moreno, Bluck, Ellison, Patton, Torrey, & Moster, MNRAS., 436, 1765, 2013
    [ ADS ] [ arXiv ]

  78. “Galaxy pairs in the Sloan Digital Sky Survey – VI. The orbital extent of enhanced star formation in interacting galaxies” Scudder, Ellison, Torrey, Patton, & Mendel, MNRAS., 426, 549, 2012
    [ ADS ] [ arXiv ]


Visualizations which I have made associated with my research.

Cosmological Gas Evolution

This shows a visualization I created of the gas distribution in one of the AREPO 20 Mpc no-feedback cosmological simulations. Both the color and the intensity reflect the total projected gas surface density. A host of gas rich disks can be seen in the haloes that our camera focuses on, as well as in along the background cosmic web. We gave it a fun soundtrack; Turn up the volume and enjoy!

GADGET/AREPO Comparison Project

This visualization I created shows nested views of the gas distribution from the GADGET/AREPO comparison project. The top panels show the gas distribution in AREPO, while the bottom panels show the same volume rendered from the GADGET simulation. One of the main points from this visualization is that the gas distribution is very different on small (galactic) scales, where we found abundant artificial clumps in the GADGET calculation.

Star Formation Enhancement in Merging Galaxies

I created this visualization from simulations that I ran with Dave Patton to identify the origin of star formation rate enhancements seen at large separations in SDSS. We found that if we sampled merger orbital parameter space, then we easily could produce galaxy pairs with enhanced star formation rates at large(!) relative separations.

Isolated Galaxy with FIRE Feedback

An animation of the stellar light for an isolated disk galaxy with a MANGA-style mask overlayed.

Isolated Galaxy with FIRE Feedback

An animation of the gas distribution for an isolated disk galaxy with a MANGA-style mask overlayed.


Illustris Stellar Mass Functions

Simple, multi-redshift fits to the Illustris stellar mass function can be found in Torrey+ (2015). The fits take the form: $$\phi = \frac{dN}{d\mathrm{Log}M_*} = A \; \tilde{ M}_* ^{\alpha + \beta \mathrm{Log}\tilde{ M}_* } \; {\rm exp} ({-\tilde{ M}_* })$$ where $$A = a_0 + a_1 z + a_2 z^2 $$ $$\alpha = \alpha_0 + \alpha_1 z + \alpha_2 z^2 $$ $$\beta = \beta_0 + \beta_1 z + \beta_2 z^2 $$ $$\gamma = \gamma_0 + \gamma_1 z + \gamma_2 z^2 $$ All of the coefficients for these formulat (a, alpha, ...) are available in the table just below. With this information it's rather straighfoward to evaluate the fits provided in that paper. However, a simple Python file for evaluating the mass functions can be downloaded from here.

Somerville and Dave Review: Illustris Paper Data

The compiled data used for the Somerville and Dave review paper can be downloaded here.

The data included there was compiled from the Illustris simulation and includes:
  • Stellar mass function
  • Star formation main sequence
  • Gas phase mass metallicity relation
  • Stellar mass metallicity relation
  • Cold gas function
  • Stellar mass Halo mass relation
Each relation is tabulated for redshifts 0, 1, 2, and 4. Feel free to contact me with further questions about this data.