Quiescent galaxies in a virialized cluster at redshift 2: evidence for accelerated size growth
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We present an analysis of the galaxy population in XLSSC 122, an X-ray-selected, virialized cluster at redshift z = 1.98. We utilize Hubble Space Telescope (HST)Wide Field Camera 3 (WFC3) photometry to characterize the activity and morphology of spectroscopically confirmed cluster members. The quiescent fraction is found to be 88(-20)(+4) percent within 0.5r(500), significantly enhanced over the field value of 20(-2)(+2) percent at z similar to 2. We find an excess of 'bulge-like' quiescent cluster members with Sersic index n > 2 relative to the field. These galaxies are found to be larger than their field counterparts at 99.6 percent confidence, being on average 63(-24)(+31) percent larger at a fixed mass of M-* = 5 x 10(10) M-circle dot . This suggests that these cluster member galaxies have experienced an accelerated size evolution relative to the field at z > 2. We discuss minor mergers as a possible mechanism underlying this disproportionate size growth.
Originalsprog | Engelsk |
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Tidsskrift | Monthly Notices of the Royal Astronomical Society |
Vol/bind | 507 |
Udgave nummer | 4 |
Sider (fra-til) | 5272-5280 |
Antal sider | 9 |
ISSN | 0035-8711 |
DOI | |
Status | Udgivet - nov. 2021 |
ID: 281983872