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. =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>10^44^erg/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>5x10^44^erg/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=0.3 MACS and archival BCGs -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 10^44^erg/s) 74 A1 --- Ha [y/n -] Presence of Halpha emission -------------------------------------------------------------------------------- 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