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CANDELS observations of the structural properties of cluster galaxies at AT z=1.62

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Abstract
We discuss the structural and morphological properties of galaxies in a z = 1.62 proto-cluster using near-IR imaging data from Hubble Space Telescope Wide Field Camera 3 data of the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). The cluster galaxies exhibit a clear color-morphology relation: galaxies with colors of quiescent stellar populations generally have morphologies consistent with spheroids, and galaxies with colors consistent with ongoing star formation have disk-like and irregular morphologies. The size distribution of the quiescent cluster galaxies shows a deficit of compact (less than or similar to 1 kpc), massive galaxies compared to CANDELS field galaxies at z = 1.6. As a result, the cluster quiescent galaxies have larger average effective sizes compared to field galaxies at fixed mass at greater than 90% significance. Combined with data from the literature, the size evolution of quiescent cluster galaxies is relatively slow from z similar or equal to 1.6 to the present, growing as (1 + z)(-0.6 +/- 0.1). If this result is generalizable, then it implies that physical processes associated with the denser cluster region seem to have caused accelerated size growth in quiescent galaxies prior to z = 1.6 and slower subsequent growth at z < 1.6 compared to galaxies in the lower density field. The quiescent cluster galaxies at z = 1.6 have higher ellipticities compared to lower redshift samples at fixed mass, and their surface-brightness profiles suggest that they contain extended stellar disks. We argue that the cluster galaxies require dissipationless (i.e., gas-poor or "dry") mergers to reorganize the disk material and to match the relations for ellipticity, stellar mass, size, and color of early-type galaxies in z < 1 clusters.
Keywords
SIMILAR-TO 2, COLOR-MAGNITUDE RELATION, HUBBLE-SPACE-TELESCOPE, HIGH-REDSHIFT GALAXIES, ULTRA-DEEP-FIELD, PASSIVELY EVOLVING GALAXIES, MORPHOLOGY-DENSITY RELATION, EXTRAGALACTIC LEGACY SURVEY, MASSIVE, ELLIPTIC GALAXIES, STAR-FORMING GALAXIES, galaxies: clusters: general, galaxies: clusters: individual, (XMM-LSS02182-05102), galaxies: elliptical and lenticular, cD, galaxies:, evolution, galaxies: high-redshift, galaxies: structure

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Chicago
Papovich, C, R Bassett, J.M Lotz, Arjen van der Wel, K-V Tran, SL Finkelstein, EF Bell, et al. 2012. “CANDELS Observations of the Structural Properties of Cluster Galaxies at AT Z=1.62.” Astrophysical Journal 750 (2).
APA
Papovich, C., Bassett, R., Lotz, J. ., van der Wel, A., Tran, K.-V., Finkelstein, S., Bell, E., et al. (2012). CANDELS observations of the structural properties of cluster galaxies at AT z=1.62. ASTROPHYSICAL JOURNAL, 750(2).
Vancouver
1.
Papovich C, Bassett R, Lotz J., van der Wel A, Tran K-V, Finkelstein S, et al. CANDELS observations of the structural properties of cluster galaxies at AT z=1.62. ASTROPHYSICAL JOURNAL. 2012;750(2).
MLA
Papovich, C, R Bassett, J.M Lotz, et al. “CANDELS Observations of the Structural Properties of Cluster Galaxies at AT Z=1.62.” ASTROPHYSICAL JOURNAL 750.2 (2012): n. pag. Print.
@article{8573786,
  abstract     = {We discuss the structural and morphological properties of galaxies in a z = 1.62 proto-cluster using near-IR imaging data from Hubble Space Telescope Wide Field Camera 3 data of the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). The cluster galaxies exhibit a clear color-morphology relation: galaxies with colors of quiescent stellar populations generally have morphologies consistent with spheroids, and galaxies with colors consistent with ongoing star formation have disk-like and irregular morphologies. The size distribution of the quiescent cluster galaxies shows a deficit of compact (less than or similar to 1 kpc), massive galaxies compared to CANDELS field galaxies at z = 1.6. As a result, the cluster quiescent galaxies have larger average effective sizes compared to field galaxies at fixed mass at greater than 90% significance. Combined with data from the literature, the size evolution of quiescent cluster galaxies is relatively slow from z similar or equal to 1.6 to the present, growing as (1 + z)(-0.6 +/- 0.1). If this result is generalizable, then it implies that physical processes associated with the denser cluster region seem to have caused accelerated size growth in quiescent galaxies prior to z = 1.6 and slower subsequent growth at z < 1.6 compared to galaxies in the lower density field. The quiescent cluster galaxies at z = 1.6 have higher ellipticities compared to lower redshift samples at fixed mass, and their surface-brightness profiles suggest that they contain extended stellar disks. We argue that the cluster galaxies require dissipationless (i.e., gas-poor or "dry") mergers to reorganize the disk material and to match the relations for ellipticity, stellar mass, size, and color of early-type galaxies in z < 1 clusters.},
  articleno    = {93},
  author       = {Papovich, C and Bassett, R and Lotz, J.M and van der Wel, Arjen and Tran, K-V and Finkelstein, SL and Bell, EF and Conselice, CJ and Dekel, A and Dunlop, JS and Guo, Yicheng and Faber, SM and Farrah, D and Ferguson, HC and Finkelstein, KD and Haeussler, B and Kocevski, DD and Koekemoer, AM and Koo, DC and McGrath, EJ and McLure, RJ and McIntosh, DH and Momcheva, I and Newman, JA and Rudnick, G and Weiner, B and Willmer, CNA and Wuyts, S},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {SIMILAR-TO 2,COLOR-MAGNITUDE RELATION,HUBBLE-SPACE-TELESCOPE,HIGH-REDSHIFT GALAXIES,ULTRA-DEEP-FIELD,PASSIVELY EVOLVING GALAXIES,MORPHOLOGY-DENSITY RELATION,EXTRAGALACTIC LEGACY SURVEY,MASSIVE,ELLIPTIC GALAXIES,STAR-FORMING GALAXIES,galaxies: clusters: general,galaxies: clusters: individual,(XMM-LSS02182-05102),galaxies: elliptical and lenticular,cD,galaxies:,evolution,galaxies: high-redshift,galaxies: structure},
  language     = {eng},
  number       = {2},
  pages        = {14},
  title        = {CANDELS observations of the structural properties of cluster galaxies at AT z=1.62},
  url          = {http://dx.doi.org/10.1088/0004-637X/750/2/93},
  volume       = {750},
  year         = {2012},
}

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