J/MNRAS/514/1231 SDSS DR16 compact galaxy groups (Zandivarez+, 2022)
The influence of Hickson-like compact group environment on galaxy luminosities.
Zandivarez A., Diaz-Gimenez E., Taverna A.
<Mon. Not. R. Astron. Soc., 514, 1231-1248 (2022)>
=2022MNRAS.514.1231Z 2022MNRAS.514.1231Z (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Redshifts ; Positional data ; Photometry, SDSS
Keywords: methods: data analysis - catalogues - galaxies: groups: general -
galaxies: luminosity function, mass function
Abstract:
Compact groups of galaxies are devised as extreme environments where
interactions may drive galaxy evolution. In this work, we analysed
whether the luminosities of galaxies inhabiting compact groups differ
from those of galaxies in loose galaxy groups. We computed the
luminosity functions of galaxy populations inhabiting a new sample of
1412 Hickson-like compact groups of galaxies identified in the Sloan
Digital Sky Survey Data Release 16. We observed a characteristic
absolute magnitude for galaxies in compact groups brighter than that
observed in the field or loose galaxy systems. We also observed a
deficiency of faint galaxies in compact groups in comparison with
loose systems. Our analysis showed that the brightening is mainly due
to galaxies inhabiting the more massive compact groups. In contrast to
what is observed in loose systems, where only the luminosities of Red
(and Early) galaxies show a dependency with group mass, luminosities
of Red and Blue (also Early and Late) galaxies in compact groups are
affected similarly as a function of group virial mass. When using
Hubble types, we observed that elliptical galaxies in compact groups
are the brightest galaxy population, and groups dominated by an
elliptical galaxy also display the brightest luminosities in
comparison with those dominated by spiral galaxies. Moreover, we show
that the general luminosity trends can be reproduced using a mock
catalogue obtained from a semi-analytical model of galaxy formation.
These results suggest that the inner extreme environment in compact
groups prompts a different evolutionary history for their galaxies.
Description:
We present the catalogue of compact groups built from the Sloan
Digital Sky Server Data Release 16 (Ahumada et al.,
2020ApJS..249....3A 2020ApJS..249....3A, Cat. V/154). Table B1 comprises the sample of
1582 compact groups with 3 or more galaxy members, while Table B2
comprises the full list of 5218 galaxy members.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 93 1582 Compact galaxy groups identified in SDSS DR16
tableb2.dat 84 5218 Galaxy members of CGs identified in SDSS DR16
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See also:
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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5- 8 I4 --- CGID Compact Group ID
12 I1 --- Ng [1/9] Number of galaxy members in the group
19- 25 F7.3 deg RAdeg Group centre right ascension (J2000)
32- 37 F6.3 deg DEdeg Group centre declination (J2000)
40- 47 F8.6 --- zmean Group mean CMB redshift
50- 57 F8.6 --- zmed Group median CMB redshift
62- 67 F6.3 arcmin thetaG Angular radius of the smallest
circumscribed circle
72- 77 F6.3 mag/arcsec2 SuBr-r Group surface brightness in the r-band
84- 89 F6.3 mag rmag r-band model magnitude of the group
brightest galaxy
93 I1 --- Flag [0/1] Flag (1)
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Note (1): Flag as follows:
0 = clean group
1 = potentially contaminated
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Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
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6- 9 I4 --- CGID Compact Group ID
18 I1 --- Nm [1/9] Galaxy index within the compact group
21- 39 I19 --- GalID Galaxy ID in SDSS DR16 (objID)
46- 52 F7.3 deg RAdeg Right ascension (J2000)
59- 64 F6.3 deg DEdeg Declination (J2000)
67- 74 F8.6 --- z Galaxy redshift corrected to the CMB
rest-frame
79- 84 F6.3 mag rmag r-band model apparent magnitude extinction
corrected in the AB system
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Acknowledgements:
Ariel Zandivarez, ariel.zandivarez(at)unc.edu.ar
(End) Patricia Vannier [CDS] 07-Sep-2022