J/A+A/640/A34 Red-sequence early-type galaxies in clusters (Andreon, 2020)
Evidence for radially independent size growth of early-type galaxies in
clusters.
Andreon S.
<Astron. Astrophys. 640, A34 (2020)>
=2020A&A...640A..34A 2020A&A...640A..34A (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Stars, masses
Keywords: galaxies: evolution - galaxies: elliptical and lenticular, cD -
galaxies: clusters: general
Abstract:
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.
Description:
Table 1 adds the radius r80 (including 80% of the galaxy flux),
concentration C85, and the applied correction to r80 to earlier
measurements of mass and effective radius re of the very same
galaxies (Paper I, Andreon et al., 2016A&A...593A...2A 2016A&A...593A...2A, Cat.
J/A+A/593/A2).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
clusters.dat 74 13 List of studied clusters
table1.dat 72 128 Coordinates, masses and sizes
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See also:
J/A+A/593/A2 : Red-sequence early-type galaxies in clusters (Andreon+, 2016)
Byte-by-byte Description of file: clusters.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Cluster Cluster name
26- 27 I2 --- NGal Number of galaxies in table3 for this cluster
29- 30 I2 h RAh Simbad cluster right ascension (J2000)
32- 33 I2 min RAm Simbad cluster right ascension (J2000)
35- 39 F5.2 s RAs Simbad cluster right ascension (J2000)
42 A1 --- DE- Simbad cluster declination sign (J2000)
43- 44 I2 deg DEd Simbad cluster declination (J2000)
46- 47 I2 arcmin DEm Simbad cluster declination (J2000)
49- 52 F4.1 arcsec DEs ? Simbad cluster declination (J2000)
54- 74 A21 --- SName Simbad name of the cluster
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Cluster Cluster name
26- 29 I4 --- ID Galaxy identification number within the cluster
32- 40 F9.5 deg RAdeg Right ascension (J2000)
42- 50 F9.5 deg DEdeg Declination (J2000)
52- 56 F5.2 [Msun] logM log10 of mass (1)
58- 61 F4.2 [kpc] logr80 log10 of the radius including 80% of the flux (1)
63- 66 F4.2 --- C85 log concentration, C85=log10(r80)/log10(r50)
68- 72 F5.2 --- PSFcorr Applied correction to log10 logr80 (dex units)
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Note (1): assuming a Bruzual & Charlot (2003MNRAS.344.1000B 2003MNRAS.344.1000B) stellar population
synthesis model with solar metallicity and Salpeter initial mass function,
omegam=0.3, omegalambda=0.7, H0=70km/s/Mpc.
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Acknowledgements:
Stefano Andreon, stefano.andreon(at)brera.inaf.it
References:
Andreon et al., Paper I 2016A&A...593A...2A 2016A&A...593A...2A, Cat. J/A+A/593/A2
(End) Patricia Vannier [CDS] 19-Jun-2020