SIMBAD references

2015MNRAS.449.3347O - Mon. Not. R. Astron. Soc., 449, 3347-3359 (2015/June-1)

The accretion histories of brightest cluster galaxies from their stellar population gradients.

OLIVA-ALTAMIRANO P., BROUGH S., JIMMY, TRAN K.-V., COUCH W.J., McDERMID R.M., LIDMAN C., VON DER LINDEN A. and SHARP R.

Abstract (from CDS):

We analyse the spatially resolved stellar populations of nine local (z < 0.1) Brightest Cluster Galaxies (BCGs) observed with VIMOS in Integral Field Unit mode. Our sample is composed of seven slow-rotating and two fast-rotating BCGs. We do not find a connection between stellar kinematics and stellar populations in this small sample. The BCGs have shallow metallicity gradients (median Δ[Fe/H] = -0.11±0.1), high central metallicities (median [Fe/H][α/Fe] = 0 = 0.13±0.07), and a wide range of central ages (from 5 to 15 Gyr). We propose that the reason for this is diverse evolutionary paths in BCGs. 67 percent of the sample (6/9) show ∼ 7 Gyr old central ages, which reflects an active accretion history, and 33 percent of the sample (3/9) have central ages older than 11 Gyr, which suggest no star formation since z = 2. The BCGs show similar central stellar populations and stellar population gradients to early-type galaxies of similar mass (Mdyn > 1011.3M) from the ATLAS3D survey (median [Z/H] = 0.04±0.07, Δ[Z/H] = -0.19±0.1). However, massive early-type galaxies from ATLAS3D have consistently old ages (median Age = 12.0±3.8 Gyr). We also analyse the close massive companion galaxies of two of the BCGs. These galaxies have similar stellar populations to their respective BCGs.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: kinematics and dynamics - galaxies: stellar content - galaxies: structure

Status at CDS:  

Simbad objects: 22

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2020.04.08-21:42:37

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