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Deep spectroscopic luminosity function of Abell 85 : no evidence for a steep upturn of the faint-end slope

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Date
11/10/2014
Author
Agulli, I.
Aguerri, J. A. L.
Sanchez-Janssen, R.
Barrena, R.
Diaferio, A.
Serra, A. L.
Mendez Abreu, Jairo
Keywords
galaxies: clusters: general
galaxies: clusters: individual: Abell 85
galaxies: dwarfs
galaxies: luminosity function, mass function
Dwarf galaxy population
Color-magnitude relation
Digital sky survey
Mass profiles
Infall regions
fornax cluster
Outer regions
Virgo
Satellites
SDSS-DR4
QB Astronomy
QC Physics
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Abstract
We present a new deep determination of the spectroscopic luminosity function (LF) within the virial radius of the nearby and massive Abell 85 (A85) cluster down to the dwarf regime (M* + 6) using Very Large Telescope/Visible Multi-Object Spectrograph (VLT/VIMOS) spectra for ∼2000 galaxies with mr ≤ 21 mag and 〈μe,r〉 ≤ 24 mag arcsec−2. The resulting LF from 438 cluster members is best modelled by a double Schechter function due to the presence of a statistically significant upturn at the faint end. The amplitude of this upturn (αf ~ -1.58+0.19-0.15), however, is much smaller than that of the Sloan Digital Sky Survey (SDSS) composite photometric cluster LF by Popesso et al., αf ∼ −2. The faint-end slope of the LF in A85 is consistent, within the uncertainties, with that of the field. The red galaxy population dominates the LF at low luminosities, and is the main factor responsible for the upturn. The fact that the slopes of the spectroscopic LFs in the field and in a cluster as massive as A85 are similar suggests that the cluster environment does not play a major role in determining the abundance of low-mass galaxies.
Citation
Agulli , I , Aguerri , J A L , Sanchez-Janssen , R , Barrena , R , Diaferio , A , Serra , A L & Mendez Abreu , J 2014 , ' Deep spectroscopic luminosity function of Abell 85 : no evidence for a steep upturn of the faint-end slope ' , Monthly Notices of the Royal Astronomical Society , vol. 444 , no. 1 , pp. L34-L38 . https://doi.org/10.1093/mnrasl/slu108
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnrasl/slu108
ISSN
0035-8711
Type
Journal article
Rights
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, © 2014 The Authors, Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Description
IA, AD and ALS acknowledge partial support from the INFN grant InDark and from the grant Progetti di Ateneo TO Call 2012 0011 ‘Marco Polo’ of the University of Torino.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5869

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