The build-up of the red sequence in the Hercules cluster

被引：7

作者：

Agulli, I. ^{[1
,2
,3
,4
]}

Aguerri, J. A. L. ^{[1
,2
]}

Dominguez Palmero, L. ^{[1
,5
]}

Diaferio, A. ^{[3
,4
]}

机构：

[1] Inst Astrofis Canarias, C Via Lactea S-N, E-38205 Tenerife, Spain

[2] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[3] Univ Torino, Dipartimento Fis, Via P Giuria 1, I-10125 Turin, Italy

[4] Ist Nazl Fis Nucl, Sez Torino, Via P Giuria 1, I-10125 Turin, Italy

[5] Isaac Newton Grp Telescopes, Apartado 321, E-38700 Santa Cruz De La Palma, Canary Islands, Spain

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 461卷 / 01期

基金：

美国国家航空航天局;

关键词：

galaxies: clusters: general; galaxies: clusters: individual: A 2151; galaxies: evolution; COLOR-MAGNITUDE RELATION; EARLY-TYPE GALAXIES; SPECTROSCOPIC LUMINOSITY FUNCTION; DIGITAL SKY SURVEY; CHEMICAL ENRICHMENT; DISTANT CLUSTERS; OUTER REGIONS; HIGH-REDSHIFT; ABELL; 85; EVOLUTION;

D O I：

10.1093/mnrasl/slw092

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the study of the colour-magnitude diagram of the cluster Abell 2151 (A 2151), with a particular focus on the low-mass end. The deep spectroscopy withAF2/WYFFOS@WHT and the caustic method enable us to obtain 360 members within 1.3 R-200 and absolute magnitude M-r less than or similar to M*(r) + 6. This nearby cluster shows a well defined red sequence up to M-r similar to -18.5; at fainter magnitudes only 36 per cent of the galaxies lie on the extrapolation of the red sequence. We compare the red sequences of A 2151 and Abell 85, which is another nearby cluster with similar spectroscopic data, but with different mass and dynamical state. Both clusters show similar red sequences at the bright end (M-r <= -19.5), whereas large differences appear at the faint end. This result suggests that the reddening of bright galaxies is independent of environment, unlike the dwarf population (M-r >= -18.0).

引用

页码：L6 / L10

页数：5

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