J/ApJ/810/138 ETGs sample for the Coma cluster (Riguccini+, 2015)
Mid-IR enhanced galaxies in the Coma & Virgo clusters: lenticulars with a high
star formation rate.
Riguccini L., Temi P., Amblard A., Fanelli M., Brighenti F.
<Astrophys. J., 810, 138 (2015)>
=2015ApJ...810..138R 2015ApJ...810..138R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Photometry, infrared
Keywords: galaxies: clusters: general -
galaxies: elliptical and lenticular, cD - galaxies: star formation
Abstract:
We explore the properties of early-type galaxies (ETGs), including
ellipticals (E) and lenticulars (S0), in rich environments, such as
clusters of galaxies (Virgo and Coma). The L24/LK distribution of
ETGs in both Virgo and Coma clusters shows that some S0s have a much
larger L24/LK ratio (0.5 to ∼2 dex) than the bulk of the ETG
population. This could be interpreted as an enhanced star formation
rate in these lenticulars. We compare the optical colors of galaxies
in these two clusters and investigate the nature of these sources with
a large L24/LK ratio by looking at their spatial distribution
within the cluster, analyzing their optical spectra, and looking at
their optical colors compared to late-types. We obtain 10 Coma and
3 Virgo early-type sources with larger L24/LK ratios than the bulk
of their population. We call these sources mid-infrared enhanced
galaxies (MIEGs). In Coma, they are mostly located in the southwest
part of the cluster where a substructure is falling onto the main
cluster. MIEGs present a lower g-r color than the rest of the ETG
sample because of a blue continuum. We interpret the excess
L24/LK ratio as evidence for enhanced star formation induced as a
consequence of their infall into the main cluster.
Description:
For the Coma Cluster, we utilize the work of Mahajan et al. (2010,
J/MNRAS/404/1745) to build our ETG sample. Mahajan et al. (2010,
J/MNRAS/404/1745) used a combination of MIPS 24 µm observations and
SDSS photometry and spectra to investigate the star formation history
of galaxies in the Coma supercluster. All of their galaxies from the
SDSS data in the Coma supercluster region are brighter than r∼17.77,
the completeness limit of the SDSS spectroscopic galaxy catalog. Their
24 µm fluxes are obtained from archival data covering 2x2 deg2 for
Coma Cluster. Our final sample of 124 sources is composed of
49 ellipticals and 75 lenticulars.
Objects:
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RA (ICRS) DE Designation(s)
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12 59 48.7 +27 58 50 Coma cluster = ACO 1656
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 70 124 Early Type Sample for the Coma Cluster
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See also:
VII/159 : Catalogue of galaxies towards the Coma Supercluster
(Slezak+ 1988)
J/A+A/303/661 : Star-forming galaxies in the Coma Cluster (Donas+, 1995)
J/A+A/395/753 : Spectroscopy of Coma early-type galaxies. II.
(Wegner+, 2002)
J/A+A/407/423 : Coma cluster early-type galaxies. III. (Mehlert+, 2003)
J/MNRAS/404/1745 : Dwarf galaxies in Coma supercluster (Mahajan+, 2010)
J/AJ/142/148 : IR observations of galaxies in the Coma cluster
(Edwards+, 2011)
J/MNRAS/440/1690 : Bulge and disc colours of ETG in Coma (Head+, 2014)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 F7.3 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
9- 14 F6.3 deg DEdeg Declination in decimal degrees (J2000) (1)
16- 20 F5.1 Mpc Dist Adopted distance (2)
22- 25 F4.1 --- T Morphological T parameter obtained from the
Hyperleda database (Paturel et al.
2003A&A...412...45P 2003A&A...412...45P, Cat. VII/237)
27- 32 F6.3 mJy F24 Spitzer/MIPS 24µm flux density from
Mahajan et al. (2010, J/MNRAS/404/1745)
34- 38 F5.3 mJy e_F24 Uncertainty in F24 provided to us by private
communication from Mahajan
40- 44 F5.2 mag Ksmag 2MASS Ks-band magnitude
46 I1 --- AGN [0/3]? AGN classification from Mahajan et al.
(2010, J/MNRAS/404/1745) (3)
48- 52 F5.2 [10-7W] logL24 Log of the 24µm luminosity (in erg/s)
54- 58 F5.2 [Lsun] logLKs Log of the Ks-band luminosity
60- 64 F5.2 mag W4mag ? WISE W4-band magnitude (22µm)
66- 70 F5.2 mag e_W4mag ? Uncertainty in W4mag
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Note (1): RAdeg and DEdeg as listed in Mahajan et al. (2010, J/MNRAS/404/1745).
Note (2): Converted from the redshift measurements from Mahajan et al.
(2010, J/MNRAS/404/1745), using H0=70 km/s/Mpc.
Note (3): Classification as follows:
0 = Unclassified source;
1 = Star forming galaxy;
3 = AGN.
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History:
From electronic version of the journal
(End) Prepared by Tiphaine Pouvreau [CDS] 20-Oct-2017