Advanced search
1 file | 503.46 KB

The majority of compact massive galaxies at z ∼ 2 are disk dominated

Author
Organization
Abstract
We investigate the stellar structure of massive, quiescent galaxies at z similar to 2, based on Hubble Space Telescope/WFC3 imaging from the Early Release Science program. Our sample of 14 galaxies has stellar masses of M-* > 10(10.8) M-circle dot and photometric redshifts of 1.5 < z < 2.5. In agreement with previous work, their half-light radii are < 2 kpc, much smaller than equally massive galaxies in the present-day universe. A significant subset of the sample appears highly flattened in projection, which implies, considering viewing angle statistics, that a significant fraction of the galaxies in our sample have pronounced disks. This is corroborated by two-dimensional surface brightness profile fits. We estimate that 65% +/- 15% of the population of massive, quiescent z similar to 2 galaxies are disk dominated. The median disk scale length is 1.5 kpc, substantially smaller than the disks of equally massive galaxies in the present-day universe. Our results provide strong observational evidence that the much-discussed ultra-dense high-redshift galaxies should generally be thought of as disk-like stellar systems with the majority of stars formed from gas that had time to settle into a disk.
Keywords
HIGH-REDSHIFT GALAXIES, STAR-FORMING GALAXIES, ULTRA-DEEP-FIELD, ELLIPTIC GALAXIES, QUIESCENT GALAXIES, SIZE EVOLUTION, DEPENDENT, EVOLUTION, GROWTH, MORPHOLOGIES, RED, cosmology: observations, galaxies: evolution, galaxies: formation

Downloads

  • The Majority of Compact Massive Galaxies at z ~ 2 are Disk Dominated.pdf
    • full text
    • |
    • open access
    • |
    • PDF
    • |
    • 503.46 KB

Citation

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

Chicago
van der Wel, Arjen, Hans-Walter Rix, Stun Wuyts, Elizabeth J McGrath, Anton M Koekemoer, Eric F Bell, Bradford P Holden, Aday R Robaina, and Daniel H McIntosh. 2011. “The Majority of Compact Massive Galaxies at z ∼ 2 Are Disk Dominated.” Astrophysical Journal 730 (1).
APA
van der Wel, A., Rix, H.-W., Wuyts, S., McGrath, E. J., Koekemoer, A. M., Bell, E. F., Holden, B. P., et al. (2011). The majority of compact massive galaxies at z ∼ 2 are disk dominated. ASTROPHYSICAL JOURNAL, 730(1).
Vancouver
1.
van der Wel A, Rix H-W, Wuyts S, McGrath EJ, Koekemoer AM, Bell EF, et al. The majority of compact massive galaxies at z ∼ 2 are disk dominated. ASTROPHYSICAL JOURNAL. 2011;730(1).
MLA
van der Wel, Arjen, Hans-Walter Rix, Stun Wuyts, et al. “The Majority of Compact Massive Galaxies at z ∼ 2 Are Disk Dominated.” ASTROPHYSICAL JOURNAL 730.1 (2011): n. pag. Print.
@article{8575206,
  abstract     = {We investigate the stellar structure of massive, quiescent galaxies at z similar to 2, based on Hubble Space Telescope/WFC3 imaging from the Early Release Science program. Our sample of 14 galaxies has stellar masses of M-* > 10(10.8) M-circle dot and photometric redshifts of 1.5 < z < 2.5. In agreement with previous work, their half-light radii are < 2 kpc, much smaller than equally massive galaxies in the present-day universe. A significant subset of the sample appears highly flattened in projection, which implies, considering viewing angle statistics, that a significant fraction of the galaxies in our sample have pronounced disks. This is corroborated by two-dimensional surface brightness profile fits. We estimate that 65% +/- 15% of the population of massive, quiescent z similar to 2 galaxies are disk dominated. The median disk scale length is 1.5 kpc, substantially smaller than the disks of equally massive galaxies in the present-day universe. Our results provide strong observational evidence that the much-discussed ultra-dense high-redshift galaxies should generally be thought of as disk-like stellar systems with the majority of stars formed from gas that had time to settle into a disk.},
  articleno    = {38},
  author       = {van der Wel, Arjen and Rix, Hans-Walter and Wuyts, Stun and McGrath, Elizabeth J and Koekemoer, Anton M and Bell, Eric F and Holden, Bradford P and Robaina, Aday R and McIntosh, Daniel H},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {HIGH-REDSHIFT GALAXIES,STAR-FORMING GALAXIES,ULTRA-DEEP-FIELD,ELLIPTIC GALAXIES,QUIESCENT GALAXIES,SIZE EVOLUTION,DEPENDENT,EVOLUTION,GROWTH,MORPHOLOGIES,RED,cosmology: observations,galaxies: evolution,galaxies: formation},
  language     = {eng},
  number       = {1},
  pages        = {5},
  title        = {The majority of compact massive galaxies at z ∼ 2 are disk dominated},
  url          = {http://dx.doi.org/10.1088/0004-637X/730/1/38},
  volume       = {730},
  year         = {2011},
}

Altmetric
View in Altmetric
Web of Science
Times cited: