J/MNRAS/384/1502 NIR photometry of X-ray luminous BCGs (Stott+, 2008)
Near-infrared evolution of brightest cluster galaxies in the most X-ray luminous
clusters since z = 1.
Stott J.P., Edge A.C., Smith G.P., Swinbank A.M., Ebeling H.
<Mon. Not. R. Astron. Soc., 384, 1502-1510 (2008)>
=2008MNRAS.384.1502S 2008MNRAS.384.1502S
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Galaxies, IR ; Redshifts ;
Photometry, infrared
Keywords: galaxies: clusters: general -
galaxies: elliptical and lenticular, cD - galaxies: evolution -
cosmology: observations - infrared: galaxies
Abstract:
We investigate the near-infrared evolution of brightest cluster
galaxies (BCGs) from a sample of rich galaxy clusters since z∼1.
By employing an X-ray selection of LX>1044erg/s, we limit
environmental effects by selecting BCGs in comparably high-density
regions. We find a positive relationship between X-ray and
near-infrared luminosity for BCGs in clusters with LX>5x1044erg/s.
Applying a correction for this relation, we reduce the scatter in the
BCG absolute magnitude by a factor of 30 per cent. The near-infrared
J-K colour evolution demonstrates that the stellar population in
BCGs has been in place since at least z=2, and that we expect a
shorter period of star formation than that predicted by current
hierarchical merger models. We also confirm that there is a
relationship between 'blue' J-K colour and the presence of BCG
emission lines associated with star formation in cooling flows.
Description:
To select BCGs in a homogeneous sample of massive clusters from z=0-1,
we require X-ray selected clusters from a number of large surveys.
A combination of the Two-Micron All-Sky Survey (2MASS) extended and
point source catalogues (Skrutskie et al., 2006, Cat. VII/233) is
used for the z<0.15 BCS, eBCS and XBACS BCGs.
The 0.15<z<0.3 BCS, eBCS and XBACS observations were performed in
2004 and 2005 in variable seeing (0.9-1.5arcsec) with the Wide-field
InfraRed Camera (WIRC) instrument on the Palomar 200arcsec Hale
telescope.
The 0.3<z<0.7 MACS data are from three sources. Part of these data
were obtained in 2002 in 0.4-0.7arcsec seeing using the UKIRT
Fast-Track Imager (UFTI) camera on the United Kingdom InfraRed
Telescope (UKIRT). More MACS clusters were observed in ∼1.0arcsec
seeing in 2002 again with the WIRC instrument on the Palomar 200arcsec
Hale telescope. The remaining clusters were observed in 2004 (PI:
J.-P. Kneib) in ∼0.6arcsec seeing conditions using the Infrared
Spectrometer And Array Camera (ISAAC) on the Very Large Telescope (VLT).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 74 40 z≤0.15 2MASS BCGs
tablea2.dat 74 46 0.15≤z≤0.3 Wide-field InfraRed Camera (WIRC) BCGs
tablea3.dat 72 18 z≥0.3 MACS and archival BCGs
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See also:
I/221 : The Magellanic Catalogue of Stars - MACS (Tucholke+ 1996)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
Byte-by-byte Description of file: tablea1.dat tablea2.dat tablea3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Galaxy cluster name
19- 20 I2 h RAh BCG Right ascension (J2000)
22- 23 I2 min RAm BCG Right ascension (J2000)
25- 29 F5.2 s RAs BCG Right ascension (J2000)
31 A1 --- DE- BCG Declination sign (J2000)
32- 33 I2 deg DEd BCG Declination (J2000)
35- 36 I2 arcmin DEm BCG Declination (J2000)
38- 41 F4.1 arcsec DEs BCG Declination (J2000)
43- 47 F5.3 --- z Redshift
49- 53 F5.2 mag Jmag ?=0.000 J magnitude
55- 59 F5.2 mag Kmag K magnitude
61- 66 F6.2 mag KMAG Absolute K magnitude
68- 72 F5.2 10+37W LX X-ray luminosity (in 1044erg/s)
74 A1 --- Ha [y/n -] Presence of Halpha emission
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Nomenclature note:
Galaxies identified as [SES2008] JHHMMSS.ss+DDMMSS.s in Simbad
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Jun-2009