Quiescent galaxies in a virialized cluster at redshift 2: evidence for accelerated size growth
Autor: | Steven W. Allen, G. Brammer, S. A. Stanford, Adam Mantz, J. P. Willis, R. E. A. Canning, Emil Noordeh |
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Rok vydání: | 2021 |
Předmět: |
Field (physics)
MERGERS Star (game theory) Population FOS: Physical sciences Astrophysics SIMILAR-TO 1 01 natural sciences STAR-FORMATION Photometry (optics) 0103 physical sciences COLOR-MAGNITUDE RELATION Cluster (physics) clusters: general [galaxies] fundamental parameters [galaxies] FIELD 10. No inequality education 010303 astronomy & astrophysics evolution [galaxies] Physics education.field_of_study 010308 nuclear & particles physics Astronomy and Astrophysics DISK GALAXIES stellar content [galaxies] Astrophysics - Astrophysics of Galaxies EVOLUTION TRANSFORMATION Redshift Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) structure [galaxies] STELLAR-MASS SPIRAL GALAXIES high-redshift [galaxies] |
Zdroj: | Noordeh, E, Canning, R E A, Willis, J P, Allen, S W, Mantz, A, Stanford, S A & Brammer, G 2021, ' Quiescent galaxies in a virialized cluster at redshift 2 : evidence for accelerated size growth ', Monthly Notices of the Royal Astronomical Society, vol. 507, no. 4, pp. 5272-5280 . https://doi.org/10.1093/mnras/stab2459 |
ISSN: | 1365-2966 0035-8711 |
Popis: | We present an analysis of the galaxy population in XLSSC 122, an X-ray selected, virialized cluster at redshift $z=1.98$. We utilize HST WFC3 photometry to characterize the activity and morphology of spectroscopically confirmed cluster members. The quiescent fraction is found to be $88^{+4}_{-20}$ per cent within 0.5$r_{500}$, significantly enhanced over the field value of $20^{+2}_{-2}$ per cent at $z\sim2$. 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 per cent confidence, being on average $63^{+31}_{-24}$ per cent larger at a fixed mass of $M_\star = 5\times10^{10} M_\odot$. 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. 9 pages, 7 figures, accepted for publication in MNRAS |
Databáze: | OpenAIRE |
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