The galaxy population of the z=1 cluster of galaxies MG2016+112
| dc.creator | Toft, S. | |
| dc.creator | Soucail, G. | |
| dc.creator | Hjorth, J. | |
| dc.date | 2003-03-04 | |
| dc.date.accessioned | 2026-07-07T06:33:32Z | |
| dc.date.available | 2026-07-07T06:33:32Z | |
| dc.description | A photometric redshift analysis of galaxies in the field of the wide-separation gravitational lens MG2016+112 reveals a population of 69 galaxies with photometric redshifts consistent with being in a cluster at the redshift of the giant elliptical lensing galaxy, z=1.00. The Ks-band luminosity function of the cluster galaxies is well represented by the Schechter function with a characteristic magnitude Ks*=18.90 (-0.57/+0.45) and faint-end slope alpha=-0.60 (-0.33/+0.39), consistent with what is expected for a passively evolving population of galaxies formed at high redshift, zf>2. From the total Ks-band flux of the cluster galaxies and a dynamical estimate of the total mass of the cluster, the restframe Ks-band mass-to-light ratio of the cluster is derived to be M/L=27(-17/+64)(h_50)(M/L)_{sun}, in agreement with the upper limit derived earlier from Chandra X-ray observations and the value derived locally in the Coma cluster. The cluster galaxies span a red sequence with a considerable scatter in the colour-magnitude diagrams, suggesting that they contain young stellar populations in addition to the old populations of main-sequence stars that dominate the Ks-band luminosity function. This is in agreement with spectroscopic observations which show that 5 out of the 6 galaxies in the field confirmed to be at the redshift of the lensing galaxy have emission lines. The projected spatial distribution of the cluster galaxies is filamentary-like rather than centrally concentrated around the lensing galaxy, and show no apparent luminosity segregation. A handful of the cluster galaxies show evidence of merging/interaction. The results presented in this paper suggest that a young cluster of galaxies is assembling around MG2016+112. | |
| dc.description | Accepted for publication in MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0303066 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0303066 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc. 344 (2003) 337 | |
| dc.identifier | doi:10.1046/j.1365-8711.2003.06589.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/99224 | |
| dc.subject | Astrophysics | |
| dc.title | The galaxy population of the z=1 cluster of galaxies MG2016+112 | |
| dc.type | text |