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J/MNRAS/389/1074    LX-σ relation of galaxy clusters    (Shen+, 2008)

Radio-loud active galactic nuclei and the LX-σ relation of galaxy groups and clusters. Shen S., Kauffmann G., Linden A.V.D., White S.D.M., Best P.N. <Mon. Not. R. Astron. Soc., 389, 1074-1086 (2008)> =2008MNRAS.389.1074S
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Velocity dispersion Keywords: galaxies: clusters: general - galaxies: jets Abstract: We use the ROSAT All-Sky Survey to study the X-ray properties of a sample of 625 groups and clusters of galaxies selected from the Sloan Digital Sky Survey. We stack clusters with similar velocity dispersions and investigate whether their average X-ray luminosities and surface brightness profiles vary with the radio activity level of their central galaxies. We find that at a given value of σ, clusters with a central radio active galactic nucleus (AGN) have more concentrated X-ray surface brightness profiles, larger central galaxy masses and higher X-ray luminosities than clusters with radio-quiet central galaxies. The enhancement in X-ray luminosity is more than a factor of 2, is detected with better than 6σ significance and cannot be explained by X-ray emission from the radio AGN itself. This difference is largely due to a subpopulation of radio-quiet, high velocity dispersion clusters with low-mass central galaxies. These clusters are underluminous at X-ray wavelengths when compared to otherwise similar clusters where the central galaxy is radio-loud, more massive, or both. Description: We use the RASS to study the X-ray properties of our sample of groups and clusters. The RASS mapped the sky in the soft X-ray band (0.1-2.4keV) with exposure time varying between 400 and 40000s, depending on direction on the sky. The resolution of the RASS images is 45 arcsec. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 95 159 *Clusters of galaxies individually detected in RASS
Note on tablea1.dat: Here we list the basic properties of 159 clusters of galaxies individually detected in RASS.
See also: J/AJ/130/968 : SDSS-C4 cluster catalog (Miller+, 2005) : SDSS Home Page : SDSS-C4 Galaxy Cluster Catalog Home Page Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- SDSS-C4 ID of cluster in SDSS C4 cluster catalogue (Miller et al., Cat. J/AJ/130/968) 6- 14 F9.5 deg RAdeg BCG right ascension (J2000) in decimal degrees 16- 24 F9.5 deg DEdeg BCG declination (J2000) in decimal degrees 26- 33 F8.4 deg RAXdeg ? X-ray centre right ascension (J2000) in decimal degrees 35- 42 F8.4 deg DEXdeg ? X-ray centre declination (J2000) in decimal degrees 44- 49 F6.4 --- z Redshift of the BCG 51- 54 F4.1 arcmin R200 Virial radius R200 56- 61 F6.1 km/s sigma Velocity dispersion 63- 68 F6.3 fW/m2 FX Flux within RX in the energy band 0.5-2.0kev (in 10-12erg/cm2/s) 70- 73 F4.1 arcmin RadX X-ray extension radius RX 75- 79 F5.3 --- Err Fractional error on count rate(flux) within RX 81- 85 F5.3 --- fE Extension correction factor fE (1) 87- 92 F6.3 10+37W LX Bolometric X-ray luminosity after the extension correction (in 1044erg/s) 94- 95 I2 --- rCl Radio loudness property of BCG (2)
Note (1): The extension correction factor fE is then defined as fE=[{}IX(r)rdr]/[{}IX(r)rdr] where IX(R)=I0[1+(R2/Rc2)]^(-3beta+0.5), I0 is the central surface brightness and Rc is the core radius and is assumed to be proportional to R200, with Rc=0.14R200 for radio-loud clusters and Rc=0.18R200 for radio-quiet clusters. Note (2): Classification numbered as follows: 1 = clusters with BCG to be radio-loud AGN 0 = clusters with BCG to be radio-quiet -1 = others clusters
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Oct-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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