The built-up of the red sequence in the Hercules cluster
| Autor: | L. Dominguez Palmero, J. A. L. Aguerri, Antonaldo Diaferio, I. Agulli |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Absolute magnitude 010308 nuclear & particles physics Diagram FOS: Physical sciences Galaxies: clusters: individual: A 2151 Galaxies: evolution Astronomy Astronomy and Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxies: clusters: general Space and Planetary Science Abell 2744 Astrophysics of Galaxies (astro-ph.GA) Galaxy group 0103 physical sciences Cluster (physics) Brightest cluster galaxy Spectroscopy 010303 astronomy & astrophysics Galaxy cluster |
| Zdroj: | Monthly Notices of the Royal Astronomical Society: Letters. 461:L6-L10 |
| ISSN: | 1745-3933 1745-3925 |
| DOI: | 10.1093/mnrasl/slw092 |
| Popis: | We present the study of the colour-magnitude diagram of the cluster Abell 2151 (A2151), with a particular focus on the low-mass end. The deep spectroscopy with AF2/WYFFOS@WHT and the caustic method enable us to obtain 360 members within 1.3 R_200 and absolute magnitude M_r < M*_r+6. This nearby cluster shows a well defined red sequence up to M_r ~ - 18.5; at fainter magnitudes only 36% of the galaxies lie on the extrapolation of the red sequence. We compare the red sequences of A2151 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). 5 pages, 4 figures, accepted for publication as a letter in MNRAS |
| Databáze: | OpenAIRE |
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