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The relationship between galaxy and dark matter halo size from z ∼ 3 to the present

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Abstract
We explore empirical constraints on the statistical relationship between the radial size of galaxies and the radius of their host dark matter haloes from z similar to 0.1-3 using the Galaxy And Mass Assembly (GAMA) and Cosmic Assembly Near Infrared Deep Extragalactic Legacy Survey (CANDELS) surveys. We map dark matter halo mass to galaxy stellar mass using relationships from abundance matching, applied to the Bolshoi-Planck dissipationless N-body simulation. We define SRHR equivalent to r(e)/R-h as the ratio of galaxy radius to halo virial radius, and SRHR lambda equivalent to r(e)/(lambda R-h) as the ratio of galaxy radius to halo spin parameter times halo radius. At z similar to 0.1, we find an average value of SRHR similar or equal to 0.018 and SRHR. similar or equal to 0.5 with very little dependence on stellar mass. Stellar radius-halo radius (SRHR) and SRHR lambda have a weak dependence on cosmic time since z similar to 3. SRHR shows a mild decrease over cosmic time for low-mass galaxies, but increases slightly or does not evolve formoremassive galaxies. We find hints that at high redshift (z similar to 2-3), SRHR. is lower for more massive galaxies, while it shows no significant dependence on stellar mass at z less than or similar to 0.5. We find that for both the GAMA and CANDELS samples, at all redshifts from z similar to 0.1-3, the observed conditional size distribution in stellar mass bins is remarkably similar to the conditional distribution of lambda R-h. We discuss the physical interpretation and implications of these results.
Keywords
galaxies: evolution, galaxies: formation, galaxies: high-redshift, galaxies: structure, CATALOGS SOURCE IDENTIFICATION, ALPHA ABSORPTION SYSTEMS, MASS DENSITY EVOLUTION, ACTIVE GALACTIC NUCLEI, STAR-FORMING GALAXIES, ANGULAR-MOMENTUM, DISK GALAXIES, HIGH-REDSHIFT, STELLAR MASS, SEMIANALYTIC MODEL

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Citation

Please use this url to cite or link to this publication:

Chicago
Somerville, Rachel S, Peter Behroozi, Viraj Pandya, Avishai Dekel, SM Faber, Adriano Fontana, Anton M Koekemoer, et al. 2018. “The Relationship Between Galaxy and Dark Matter Halo Size from z ∼ 3 to the Present.” Monthly Notices of the Royal Astronomical Society 473 (2): 2714–2736.
APA
Somerville, R. S., Behroozi, P., Pandya, V., Dekel, A., Faber, S., Fontana, A., Koekemoer, A. M., et al. (2018). The relationship between galaxy and dark matter halo size from z ∼ 3 to the present. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 473(2), 2714–2736.
Vancouver
1.
Somerville RS, Behroozi P, Pandya V, Dekel A, Faber S, Fontana A, et al. The relationship between galaxy and dark matter halo size from z ∼ 3 to the present. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2018;473(2):2714–36.
MLA
Somerville, Rachel S, Peter Behroozi, Viraj Pandya, et al. “The Relationship Between Galaxy and Dark Matter Halo Size from z ∼ 3 to the Present.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.2 (2018): 2714–2736. Print.
@article{8562692,
  abstract     = {We explore empirical constraints on the statistical relationship between the radial size of galaxies and the radius of their host dark matter haloes from z similar to 0.1-3 using the Galaxy And Mass Assembly (GAMA) and Cosmic Assembly Near Infrared Deep Extragalactic Legacy Survey (CANDELS) surveys. We map dark matter halo mass to galaxy stellar mass using relationships from abundance matching, applied to the Bolshoi-Planck dissipationless N-body simulation. We define SRHR equivalent to r(e)/R-h as the ratio of galaxy radius to halo virial radius, and SRHR lambda equivalent to r(e)/(lambda R-h) as the ratio of galaxy radius to halo spin parameter times halo radius. At z similar to 0.1, we find an average value of SRHR similar or equal to 0.018 and SRHR. similar or equal to 0.5 with very little dependence on stellar mass. Stellar radius-halo radius (SRHR) and SRHR lambda have a weak dependence on cosmic time since z similar to 3. SRHR shows a mild decrease over cosmic time for low-mass galaxies, but increases slightly or does not evolve formoremassive galaxies. We find hints that at high redshift (z similar to 2-3), SRHR. is lower for more massive galaxies, while it shows no significant dependence on stellar mass at z less than or similar to 0.5. We find that for both the GAMA and CANDELS samples, at all redshifts from z similar to 0.1-3, the observed conditional size distribution in stellar mass bins is remarkably similar to the conditional distribution of lambda R-h. We discuss the physical interpretation and implications of these results.},
  author       = {Somerville, Rachel S and Behroozi, Peter and Pandya, Viraj and Dekel, Avishai and Faber, SM and Fontana, Adriano and Koekemoer, Anton M and Koo, David C and P{\'e}rez-Gonz{\'a}lez, PG and Primack, Joel R and Santini, Paola and Taylor, Edward N and van der Wel, Arjen},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  language     = {eng},
  number       = {2},
  pages        = {2714--2736},
  title        = {The relationship between galaxy and dark matter halo size from z~\ensuremath{\sim}~3 to the present},
  url          = {http://dx.doi.org/10.1093/mnras/stx2040},
  volume       = {473},
  year         = {2018},
}

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