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HST/WFC3 grism observations of z similar to 1 clusters: the cluster versus field stellar mass-size relation and evidence for size growth of quiescent galaxies from minor mergers

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Abstract
Minor mergers are thought to be responsible for the size growth of quiescent field galaxies with decreasing redshift. We test this hypothesis using the cluster environment as a laboratory. Satellite galaxies in clusters move at high velocities, making mergers between them rare. The stellar mass-size relation in 10 clusters and in the field is measured and compared at z similar to 1. Our cluster sample contains 344 spectroscopically confirmed cluster members with Gemini/Gemini Multi-Object Spectrographs and 182 confirmed with Hubble Space Telescope/Wide Field Camera 3 G141 grism spectroscopy. On average, quiescent and star-forming cluster galaxies are smaller than their field counterparts by (0.08 +/- 0.04) and (0.07 +/- 0.01) dex, respectively. These size offsets are consistent with the average sizes of quiescent and star-forming field galaxies between 1.2 <= z <= 1.5, implying the cluster environment has inhibited size growth between this period and z similar to 1. The negligible differences measured between the z similar to 0 field and cluster quiescent mass-size relations in other works imply that the average size of quiescent cluster galaxies must rise with decreasing redshift. Using a toy model, we show that the disappearance of the compact cluster galaxies might be explained if, on average, similar to 40 per cent of them merge with their brightest cluster galaxies (BCGs) and similar to 60 per cent are tidally destroyed into the intracluster light (ICL) between 0 <= z <= 1. This is in agreement with the observed stellar mass growth of BCGs between 0 <= z <= 1 and the observed ICL stellar mass fraction at z similar to 0. Our results support minor mergers as the cause for the size growth in quiescent field galaxies, with cluster-specific processes responsible for the similarity between the field and cluster quiescent mass-size relations at low redshift.
Keywords
HIGH-REDSHIFT GALAXIES, SPECTROSCOPIC CONFIRMATION, ELLIPTIC GALAXIES, STAR-FORMATION, DISK GALAXIES, EVOLUTION, ENVIRONMENT, SEQUENCE, COMPACT, TRANSFORMATION, galaxies: clusters: general, galaxies: evolution, galaxies:, high-redshift, galaxies: star formation, galaxies: stellar content

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Chicago
Matharu, J., A. Muzzin, G. B. Brammer, R. F. J. van der Burg, M. W. Auger, P. C. Hewett, Arjen van der Wel, et al. 2019. “HST/WFC3 Grism Observations of z Similar to 1 Clusters: The Cluster Versus Field Stellar Mass-size Relation and Evidence for Size Growth of Quiescent Galaxies from Minor Mergers.” Monthly Notices of the Royal Astronomical Society 484 (1): 595–617.
APA
Matharu, J., Muzzin, A., Brammer, G. B., van der Burg, R. F. J., Auger, M. W., Hewett, P. C., van der Wel, A., et al. (2019). HST/WFC3 grism observations of z similar to 1 clusters: the cluster versus field stellar mass-size relation and evidence for size growth of quiescent galaxies from minor mergers. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 484(1), 595–617.
Vancouver
1.
Matharu J, Muzzin A, Brammer GB, van der Burg RFJ, Auger MW, Hewett PC, et al. HST/WFC3 grism observations of z similar to 1 clusters: the cluster versus field stellar mass-size relation and evidence for size growth of quiescent galaxies from minor mergers. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. Oxford: Oxford Univ Press; 2019;484(1):595–617.
MLA
Matharu, J. et al. “HST/WFC3 Grism Observations of z Similar to 1 Clusters: The Cluster Versus Field Stellar Mass-size Relation and Evidence for Size Growth of Quiescent Galaxies from Minor Mergers.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 484.1 (2019): 595–617. Print.
@article{8620680,
  abstract     = {Minor mergers are thought to be responsible for the size growth of quiescent field galaxies with decreasing redshift. We test this hypothesis using the cluster environment as a laboratory. Satellite galaxies in clusters move at high velocities, making mergers between them rare. The stellar mass-size relation in 10 clusters and in the field is measured and compared at z similar to 1. Our cluster sample contains 344 spectroscopically confirmed cluster members with Gemini/Gemini Multi-Object Spectrographs and 182 confirmed with Hubble Space Telescope/Wide Field Camera 3 G141 grism spectroscopy. On average, quiescent and star-forming cluster galaxies are smaller than their field counterparts by (0.08 +/- 0.04) and (0.07 +/- 0.01) dex, respectively. These size offsets are consistent with the average sizes of quiescent and star-forming field galaxies between 1.2 <= z <= 1.5, implying the cluster environment has inhibited size growth between this period and z similar to 1. The negligible differences measured between the z similar to 0 field and cluster quiescent mass-size relations in other works imply that the average size of quiescent cluster galaxies must rise with decreasing redshift. Using a toy model, we show that the disappearance of the compact cluster galaxies might be explained if, on average, similar to 40 per cent of them merge with their brightest cluster galaxies (BCGs) and similar to 60 per cent are tidally destroyed into the intracluster light (ICL) between 0 <= z <= 1. This is in agreement with the observed stellar mass growth of BCGs between 0 <= z <= 1 and the observed ICL stellar mass fraction at z similar to 0. Our results support minor mergers as the cause for the size growth in quiescent field galaxies, with cluster-specific processes responsible for the similarity between the field and cluster quiescent mass-size relations at low redshift.},
  author       = {Matharu, J. and Muzzin, A. and Brammer, G. B. and van der Burg, R. F. J. and Auger, M. W. and Hewett, P. C. and van der Wel, Arjen and van Dokkum, P. and Balogh, M. and Chan, J. C. C. and Demarco, R. and Marchesini, D. and Nelson, E. J. and Noble, A. and Wilson, G. and Yee, H. K. C.},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keywords     = {HIGH-REDSHIFT GALAXIES,SPECTROSCOPIC CONFIRMATION,ELLIPTIC GALAXIES,STAR-FORMATION,DISK GALAXIES,EVOLUTION,ENVIRONMENT,SEQUENCE,COMPACT,TRANSFORMATION,galaxies: clusters: general,galaxies: evolution,galaxies:,high-redshift,galaxies: star formation,galaxies: stellar content},
  language     = {eng},
  number       = {1},
  pages        = {595--617},
  publisher    = {Oxford Univ Press},
  title        = {HST/WFC3 grism observations of z similar to 1 clusters: the cluster versus field stellar mass-size relation and evidence for size growth of quiescent galaxies from minor mergers},
  url          = {http://dx.doi.org/10.1093/mnras/sty3465},
  volume       = {484},
  year         = {2019},
}

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