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A mass-dependent slope of the galaxy size-mass relation out to z ∼ 3 : further evidence for a direct relation between median galaxy size and median halo mass

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Abstract
We reassess the galaxy size-mass relation out to z similar to 3 using a new definition of size and a sample of >29,000 galaxies from the 3D-HST, CANDELS, and COSMOS-DASH surveys. Instead of the half-light radius r(50) we use r(80), the radius containing 80% of the stellar light. We find that the r(80)M(*) relation has the form of a broken power law, with a clear change of slope at a pivot mass M-p. Below the pivot mass the relation is shallow (r(80) proportional to M-*(0.)15); above it, it is steep (r(80) proportional to M-*(0.)6). The pivot mass increases with redshift, from log(M-p/M-circle dot) approximate to 10.2 at z = 0.4 to log(M-p/M-circle dot) approximate to 10.9 at z = 1.7-3. We compare these r(80)-M-* relations to the M-helo-M-* relations derived from galaxy-galaxy lensing, clustering analyses, and abundance matching techniques. Remarkably, the pivot stellar masses of both relations are consistent with each other at all redshifts, and the slopes are very similar both above and below the pivot when assuming M-halo proportional to r(8)(0)(3). The implied scaling factor to relate galaxy size to halo size is r(80)/R-vir = 0.047, independent of stellar mass and redshift. From redshift 0 to 1.5, the pivot mass also coincides with the mass where the fraction of star-forming galaxies is 50%, suggesting that the pivot mass reflects a transition from dissipational to dissipationless galaxy growth. Finally, our results imply that the scatter in the stellar-to-halo mass is relatively small for massive halos (similar to 0.2 dex for M-halo > 10(1)(2.)(5) M-circle dot).
Keywords
TELESCOPE ADVANCED CAMERA, STAR-FORMATION, EVOLUTION, galaxies: evolution, galaxies: halos, galaxies: high-redshift, galaxies:, structure

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Chicago
Mowla, Lamiya, Arjen van der Wel, Pieter van Dokkum, and Tim B Miller. 2019. “A Mass-dependent Slope of the Galaxy Size-mass Relation Out to z ∼ 3 : Further Evidence for a Direct Relation Between Median Galaxy Size and Median Halo Mass.” Astrophysical Journal Letters 872 (1).
APA
Mowla, L., van der Wel, A., van Dokkum, P., & Miller, T. B. (2019). A mass-dependent slope of the galaxy size-mass relation out to z ∼ 3 : further evidence for a direct relation between median galaxy size and median halo mass. ASTROPHYSICAL JOURNAL LETTERS, 872(1).
Vancouver
1.
Mowla L, van der Wel A, van Dokkum P, Miller TB. A mass-dependent slope of the galaxy size-mass relation out to z ∼ 3 : further evidence for a direct relation between median galaxy size and median halo mass. ASTROPHYSICAL JOURNAL LETTERS. 2019;872(1).
MLA
Mowla, Lamiya et al. “A Mass-dependent Slope of the Galaxy Size-mass Relation Out to z ∼ 3 : Further Evidence for a Direct Relation Between Median Galaxy Size and Median Halo Mass.” ASTROPHYSICAL JOURNAL LETTERS 872.1 (2019): n. pag. Print.
@article{8620700,
  abstract     = {We reassess the galaxy size-mass relation out to z similar to 3 using a new definition of size and a sample of >29,000 galaxies from the 3D-HST, CANDELS, and COSMOS-DASH surveys. Instead of the half-light radius r(50) we use r(80), the radius containing 80% of the stellar light. We find that the r(80)M(*) relation has the form of a broken power law, with a clear change of slope at a pivot mass M-p. Below the pivot mass the relation is shallow (r(80) proportional to M-*(0.)15); above it, it is steep (r(80) proportional to M-*(0.)6). The pivot mass increases with redshift, from log(M-p/M-circle dot) approximate to 10.2 at z = 0.4 to log(M-p/M-circle dot) approximate to 10.9 at z = 1.7-3. We compare these r(80)-M-* relations to the M-helo-M-* relations derived from galaxy-galaxy lensing, clustering analyses, and abundance matching techniques. Remarkably, the pivot stellar masses of both relations are consistent with each other at all redshifts, and the slopes are very similar both above and below the pivot when assuming M-halo proportional to r(8)(0)(3). The implied scaling factor to relate galaxy size to halo size is r(80)/R-vir = 0.047, independent of stellar mass and redshift. From redshift 0 to 1.5, the pivot mass also coincides with the mass where the fraction of star-forming galaxies is 50%, suggesting that the pivot mass reflects a transition from dissipational to dissipationless galaxy growth. Finally, our results imply that the scatter in the stellar-to-halo mass is relatively small for massive halos (similar to 0.2 dex for M-halo > 10(1)(2.)(5) M-circle dot).},
  articleno    = {L13},
  author       = {Mowla, Lamiya and van der Wel, Arjen and van Dokkum, Pieter and Miller, Tim B},
  issn         = {2041-8205},
  journal      = {ASTROPHYSICAL JOURNAL LETTERS},
  keywords     = {TELESCOPE ADVANCED CAMERA,STAR-FORMATION,EVOLUTION,galaxies: evolution,galaxies: halos,galaxies: high-redshift,galaxies:,structure},
  language     = {eng},
  number       = {1},
  pages        = {6},
  title        = {A mass-dependent slope of the galaxy size-mass relation out to z ∼ 3 : further evidence for a direct relation between median galaxy size and median halo mass},
  url          = {http://dx.doi.org/10.3847/2041-8213/aa0379},
  volume       = {872},
  year         = {2019},
}

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