Deep spectroscopy of nearby galaxy clusters: I. Spectroscopic luminosity function of Abell 85
| Autor: | R. Barrena, Heng Yu, Antonaldo Diaferio, L. Dominguez Palmero, J. A. L. Aguerri, C. Dalla Vecchia, I. Agulli, Rubén Sánchez-Janssen |
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| Rok vydání: | 2016 |
| Předmět: |
Galaxies: Clusters: Individual: A85
FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Luminosity Galaxies: Dwarf Galaxies: Luminosity function mass function Astronomy and Astrophysics Space and Planetary Science 0103 physical sciences William Herschel Telescope Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Galaxy cluster Astrophysics::Galaxy Astrophysics Luminosity function (astronomy) Physics Very Large Telescope 010308 nuclear & particles physics Star formation Astronomy Astrophysics - Astrophysics of Galaxies Redshift Galaxy mass function Astrophysics of Galaxies (astro-ph.GA) Galaxies: Luminosity function |
| DOI: | 10.48550/arxiv.1602.07308 |
| Popis: | We present a new deep spectroscopic catalogue for Abell 85, within 3.0 $\times$ 2.6 Mpc$^2$ and down to $M_{r} \sim M_{r}^* +6$. Using the Visible Multi-Object Spectrograph at the Very Large Telescope (VIMOS@VLT) and the AutoFiber 2 at the William Herschel Telescope (AF2@WHT), we obtained almost 1,430 new redshifts for galaxies with $m_r \leq 21$ mag and $\langle \mu_{e,r} \rangle \leq 24$ mag arcsec$^{-2}$. These redshifts, together with SDSS-DR6 and NED spectroscopic information, result in 460 confirmed cluster members. This dataset allows the study of the luminosity function (LF) of the cluster galaxies covering three orders of magnitudes in luminosities. The total and radial LFs are best modelled by a double Schechter function. The normalized LFs show that their bright ($M_{r} \leq -21.5$) and faint ($M_{r}\geq -18.0$) ends are independent of clustercentric distance and similar to the field LFs unlike the intermediate luminosity range ($-21.5 \leq M_{r} \leq -18.0$). Similar results are found for the LFs of the dominant types of galaxies: red, passive, virialized and early-infall members. On the contrary, the LFs of blue, star forming, non-virialized and recent-infall galaxies are well described by a single Schechter function. These populations contribute to a small fraction of the galaxy density in the innermost cluster region. However, in the outskirts of the cluster, they have similar densities to red, passive, virialized and early-infall members at the LF faint end. These results confirm a clear dependence of the colour and star formation of Abell 85 members in the cluster centric distance. Comment: 15 pages, 12 figures, accepted for publication on MNRAS |
| Databáze: | OpenAIRE |
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