C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET13:54:08

2020A&A...640A..34A - Astronomy and Astrophysics, volume 640A, 34-34 (2020/8-1)

Evidence for radially independent size growth of early-type galaxies in clusters.


Abstract (from CDS):

It is not well understood whether the growth of early-type cluster galaxies proceeds inside-out, outside-in, or at the same pace at all radii. In this work we measured the galaxy size, defined by the radius including 80% of the galaxy light, non-parametrically. We also determined a non-parametric estimate of galaxy light concentration, which measures the curvature of the surface brightness profile in the galaxy outskirts. We used an almost random sampling of a mass-limited sample formed by 128 morphologically early-type galaxies in clusters with logM/M≥10.7 spanning the wide range 0.17<z<1.81. From these data we derived the size-mass and concentration-mass relations, as well as their evolution. At 80% light radius, early-type galaxies in clusters are about 2.7 times larger than at 50% radius at all redshifts, and close to de Vaucouleurs profiles in the last 10Gyr. While between z=2 and z=0 both half-light and 80% light sizes increase by a factor of 1.7, concentration stays constant within 2%, that is to say the size growth of early-type galaxies in cluster environments proceeds at the same pace at both radii. Existing physical explanations proposed in the literature are inconsistent with our results, demonstrating the need for dedicated numerical simulations to identify the physical mechanism affecting the galaxy structure.

Abstract Copyright: © ESO 2020

Journal keyword(s): Galaxy: evolution - galaxies: elliptical and lenticular, cD - galaxies: clusters: general

VizieR on-line data: <Available at CDS (J/A+A/640/A34): clusters.dat table1.dat>

Status at CDS : Examining the need for a new acronym. // Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 JKCS 41 ClG 02 26 44.0 -04 41 36           ~ 41 0
2 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4267 2
3 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 781 1

    Equat.    Gal    SGal    Ecl

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