J/MNRAS/444/L63 SFRs of Brightest Cluster Galaxies (Fraser-McKelvie+, 2014)
The rarity of star formation in brightest cluster galaxies as measured by WISE.
Fraser-McKelvie A., Brown M.J.I., Pimbblet K.A.
<Mon. Not. R. Astron. Soc., 444, L63-L67 (2014)>
=2014MNRAS.444L..63F 2014MNRAS.444L..63F
ADC_Keywords: Clusters, galaxy ; Photometry, infrared
Keywords: galaxies: clusters: general -
galaxies: elliptical and lenticular, cD - galaxies: star formation -
infrared: galaxies
Abstract:
We present the mid-infrared star formation rates of 245 X-ray
selected, nearby (z<0.1) brightest cluster galaxies (BCGs). A
homogeneous and volume limited sample of BCGs was created by X-ray
selecting clusters with Lx>1x1044erg/s. The Wide-Field Infrared
Survey Explorer (WISE) All WISE Data Release provides the first
measurement of the 12µm star formation indicator for all BCGs in
the nearby Universe. Perseus A and Cygnus A are the only galaxies in
our sample to have star formation rates of >40M☉/yr, indicating
that these two galaxies are highly unusual at current times. Stellar
populations of 99±0.6 per cent of local BCGs are (approximately)
passively evolving, with star formation rates of <10M☉/yr. We
find that in general, star formation produces only modest BCG growth
at the current epoch.
Description:
A homogeneous BCG sample was created based on X-ray selection of host
clusters with LX>1x1044erg/s in the ROSAT 0.1-2.4keV band,
corresponding to an approximate cluster mass of
M2500≳1x1014M☉ (Hoekstra et al., 2011ApJ...726...48H 2011ApJ...726...48H).
We identified 144 BCGs by cross-matching the cluster sample with the
BCG catalogues of Stott et al. (2008, Cat. J/MNRAS/384/1502), Coziol
et al. (2009, Cat. J/AJ/137/4795) and Wen, Han & Liu (2012, Cat.
J/ApJS/199/34).
The remaining 123 unmatched clusters were inspected visually by AFM
and KAP in both optical (Digitized Sky Survey) and IR (Two Micron All
Sky Survey, 2MASS) images, along with a NASA/IPAC Extragalactic
Database object search to verify the redshifts of the candidate BCGs.
The vast majority of identifications were unambiguous, and in all
cases, the brightest galaxy in the 2MASS K-band at the cluster
redshift was chosen as the BCG.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 168 267 WISE photometry and derived SFRs of Brightest
Cluster Galaxy (BCG) in the BAX X-ray selected
cluster sample with LX>1044erg/s
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See also:
J/MNRAS/384/1502 : NIR photometry of X-ray luminous BCGs (Stott+, 2008)
J/AJ/137/4795 : Dynamical state of brightest cluster galaxies (Coziol+ 2009)
J/ApJS/199/34 : Clusters of galaxies in SDSS-III (Wen+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 -- Cluster Cluster name
21- 28 F8.4 deg RAdeg BCG right ascension (J2000)
30- 37 F8.4 deg DEdeg BCG declination (J2000)
39- 43 F5.3 -- z ? Cluster redshift
45- 49 F5.2 10+37W LX ? Cluster X-ray luminosity (in 1044erg/s)
51- 55 F5.2 mag W1mag ? WISE W1-band magnitude (3.3um)
57- 60 F4.2 mag e_W1mag ? Error on W1mag
62- 66 F5.2 mag W2mag ? WISE W2-band magnitude (4.6um)
68- 71 F4.2 mag e_W2mag ? Error on W2mag
73 A1 -- l_W3mag Upper Limit on W3 band magnitude flag
74- 78 F5.2 mag W3mag ? WISE W3-band magnitude (11.6um)
80- 84 F5.2 mag e_W3mag ? Error on W3mag
86- 90 F5.1 10+10Msun Mstar [1/210]? BCG Stellar Mass
92- 95 F4.2 10+10Msun E_Mstar [0.02/5]? Error on Mstar (upper value)
97-100 F4.2 10+10Msun e_Mstar [0.02/5]? Error on Mstar (lower value)
102 A1 -- l_SFR [<] Upper Limit on SFR flag
103-107 F5.2 Msun/yr SFR [0/70]? BCG star formation rate
109-113 F5.2 Msun/yr E_SFR [0/84]? Error on SFR (upper value)
115-119 F5.2 Msun/yr e_SFR [0/187]? Error on SFR (lower value)
121-168 A48 -- Com Comment on cluster of photometry
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Apr-2015