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Title: GALAXIES IN {Lambda}CDM WITH HALO ABUNDANCE MATCHING: LUMINOSITY-VELOCITY RELATION, BARYONIC MASS-VELOCITY RELATION, VELOCITY FUNCTION, AND CLUSTERING

Abstract

It has long been regarded as difficult if not impossible for a cosmological model to account simultaneously for the galaxy luminosity, mass, and velocity distributions. We revisit this issue using a modern compilation of observational data along with the best available large-scale cosmological simulation of dark matter (DM). We find that the standard cosmological model, used in conjunction with halo abundance matching (HAM) and simple dynamical corrections, fits-at least on average-all basic statistics of galaxies with circular velocities V{sub circ} > 80 km s{sup -1} calculated at a radius of {approx}10 kpc. Our primary observational constraint is the luminosity-velocity (LV) relation-which generalizes the Tully-Fisher and Faber-Jackson relations in allowing all types of galaxies to be included, and provides a fundamental benchmark to be reproduced by any theory of galaxy formation. We have compiled data for a variety of galaxies ranging from dwarf irregulars to giant ellipticals. The data present a clear monotonic LV relation from {approx}50 km s{sup -1} to {approx}500 km s{sup -1}, with a bend below {approx}80 km s{sup -1} and a systematic offset between late- and early-type galaxies. For comparison to theory, we employ our new {Lambda}CDM 'Bolshoi' simulation of DM, which has unprecedented mass and forcemore » resolution over a large cosmological volume, while using an up-to-date set of cosmological parameters. We use HAM to assign rank-ordered galaxy luminosities to the DM halos, a procedure that automatically fits the empirical luminosity function and provides a predicted LV relation that can be checked against observations. The adiabatic contraction of DM halos in response to the infall of the baryons is included as an optional model ingredient. The resulting predictions for the LV relation are in excellent agreement with the available data on both early-type and late-type galaxies for the luminosity range from M{sub r} = -14 to M{sub r} = -22. We also compare our predictions for the 'cold' baryon mass (i.e., stars and cold gas) of galaxies as a function of circular velocity with the available observations, again finding a very good agreement. The predicted circular velocity function (VF) is also in agreement with the galaxy VF from 80 to 400 km s{sup -1}, using the HIPASS survey for late-type galaxies and Sloan Digital Sky Survey (SDSS) for early-type galaxies. However, in accord with other recent results, we find that the DM halos with V{sub circ} < 80 km s{sup -1} are much more abundant than observed galaxies with the same V{sub circ}. Finally, we find that the two-point correlation function of bright galaxies in our model matches very well the results from the final data release of the SDSS, especially when a small amount of scatter is included in the HAM prescription.« less

Authors:
;  [1];  [2];  [3]
  1. Astronomy Department, New Mexico State University, MSC 4500, P.O. Box 30001, Las Cruces, NM 88003-8001 (United States)
  2. Department of Physics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)
  3. UCO/Lick Observatory, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)
Publication Date:
OSTI Identifier:
21612637
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 742; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/742/1/16; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; BARYONS; CORRELATION FUNCTIONS; COSMOLOGICAL MODELS; COSMOLOGY; GALAXIES; GALAXY CLUSTERS; LUMINOSITY; MASS; NONLUMINOUS MATTER; SIMULATION; STARS; ELEMENTARY PARTICLES; FERMIONS; FUNCTIONS; HADRONS; MATHEMATICAL MODELS; MATTER; OPTICAL PROPERTIES; PHYSICAL PROPERTIES

Citation Formats

Trujillo-Gomez, Sebastian, Klypin, Anatoly, Primack, Joel, and Romanowsky, Aaron J. GALAXIES IN {Lambda}CDM WITH HALO ABUNDANCE MATCHING: LUMINOSITY-VELOCITY RELATION, BARYONIC MASS-VELOCITY RELATION, VELOCITY FUNCTION, AND CLUSTERING. United States: N. p., 2011. Web. doi:10.1088/0004-637X/742/1/16; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Trujillo-Gomez, Sebastian, Klypin, Anatoly, Primack, Joel, & Romanowsky, Aaron J. GALAXIES IN {Lambda}CDM WITH HALO ABUNDANCE MATCHING: LUMINOSITY-VELOCITY RELATION, BARYONIC MASS-VELOCITY RELATION, VELOCITY FUNCTION, AND CLUSTERING. United States. https://doi.org/10.1088/0004-637X/742/1/16; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)
Trujillo-Gomez, Sebastian, Klypin, Anatoly, Primack, Joel, and Romanowsky, Aaron J. 2011. "GALAXIES IN {Lambda}CDM WITH HALO ABUNDANCE MATCHING: LUMINOSITY-VELOCITY RELATION, BARYONIC MASS-VELOCITY RELATION, VELOCITY FUNCTION, AND CLUSTERING". United States. https://doi.org/10.1088/0004-637X/742/1/16; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21612637,
title = {GALAXIES IN {Lambda}CDM WITH HALO ABUNDANCE MATCHING: LUMINOSITY-VELOCITY RELATION, BARYONIC MASS-VELOCITY RELATION, VELOCITY FUNCTION, AND CLUSTERING},
author = {Trujillo-Gomez, Sebastian and Klypin, Anatoly and Primack, Joel and Romanowsky, Aaron J},
abstractNote = {It has long been regarded as difficult if not impossible for a cosmological model to account simultaneously for the galaxy luminosity, mass, and velocity distributions. We revisit this issue using a modern compilation of observational data along with the best available large-scale cosmological simulation of dark matter (DM). We find that the standard cosmological model, used in conjunction with halo abundance matching (HAM) and simple dynamical corrections, fits-at least on average-all basic statistics of galaxies with circular velocities V{sub circ} > 80 km s{sup -1} calculated at a radius of {approx}10 kpc. Our primary observational constraint is the luminosity-velocity (LV) relation-which generalizes the Tully-Fisher and Faber-Jackson relations in allowing all types of galaxies to be included, and provides a fundamental benchmark to be reproduced by any theory of galaxy formation. We have compiled data for a variety of galaxies ranging from dwarf irregulars to giant ellipticals. The data present a clear monotonic LV relation from {approx}50 km s{sup -1} to {approx}500 km s{sup -1}, with a bend below {approx}80 km s{sup -1} and a systematic offset between late- and early-type galaxies. For comparison to theory, we employ our new {Lambda}CDM 'Bolshoi' simulation of DM, which has unprecedented mass and force resolution over a large cosmological volume, while using an up-to-date set of cosmological parameters. We use HAM to assign rank-ordered galaxy luminosities to the DM halos, a procedure that automatically fits the empirical luminosity function and provides a predicted LV relation that can be checked against observations. The adiabatic contraction of DM halos in response to the infall of the baryons is included as an optional model ingredient. The resulting predictions for the LV relation are in excellent agreement with the available data on both early-type and late-type galaxies for the luminosity range from M{sub r} = -14 to M{sub r} = -22. We also compare our predictions for the 'cold' baryon mass (i.e., stars and cold gas) of galaxies as a function of circular velocity with the available observations, again finding a very good agreement. The predicted circular velocity function (VF) is also in agreement with the galaxy VF from 80 to 400 km s{sup -1}, using the HIPASS survey for late-type galaxies and Sloan Digital Sky Survey (SDSS) for early-type galaxies. However, in accord with other recent results, we find that the DM halos with V{sub circ} < 80 km s{sup -1} are much more abundant than observed galaxies with the same V{sub circ}. Finally, we find that the two-point correlation function of bright galaxies in our model matches very well the results from the final data release of the SDSS, especially when a small amount of scatter is included in the HAM prescription.},
doi = {10.1088/0004-637X/742/1/16; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
url = {https://www.osti.gov/biblio/21612637}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 742,
place = {United States},
year = {Sun Nov 20 00:00:00 EST 2011},
month = {Sun Nov 20 00:00:00 EST 2011}
}