COSMOS X-ray Group Catalog Definitions

Overview

The reference for this catalog is George et al. (2011). This is a COSMOS X-ray group membership catalog, combining X-ray group properties from Finoguenov et al. in prep. (also 2007) with estimates for masses and radii calibrated from weak lensing (Leauthaud et al. 2010), and member galaxy information (George et al. 2011). Group redshifts have been determined by searching for red sequence overdensities within 500 kpc of the X-ray centers and are refined by using spectroscopic redshifts when available. We use groups with z<1 to ensure good optical identifications and small photoz uncertainties.

Please see the README for more details.

Name Intype Units Description
GROUP_ID int Group ID number
ra double deg Right Ascension (J2000)
dec double deg Declination (J2000)
XRAY_POS_ERR float deg Position uncertainty of X-ray source
REDSHIFT float Redshift
REDSHIFT_ERR float Redshift uncertainty
LX float log(LX / erg/s) X-ray luminosity from Finoguenov et al., in preparation
LX_ERR float log(LX / erg/s) LX uncertainty from Finoguenov et al., in preparation
LX_SCALE float Scaled X-ray luminosity (log(LX / erg/s)/E(z)) from Finoguenov et al., in preparation
XRAY_FLUX float X-ray flux (log(flux / erg/s/cm^2)) from Finoguenov et al., in preparation
XRAY_FLUX_ERR float X-ray flux uncertainty (log(flux / erg/s/cm^2)) from Finoguenov et al., in preparation
FLAG_MASK int Mask flag (1=masked, 0=clean)
FLAG_POOR int Poor group flag (1=three or fewer members, 0=4+ members)
FLAG_MERGER int Merger flag (N=number of overlapping groups)
FLAG_INCLUDE int Quality flag (1=good, 0=bad)
Good is defined as {XFLAG<3, FLAG_MASK=FLAG_POOR=FLAG_MERGER=0}
M200C float log(M / Msun) Mass
R200C_MPC float Mpc Physical radius
R200C_AS float arcsec Angular radius
CONC200C float Concentration
NMEM int Number of group members (P_MEM>0.5)
NMEM_W float Sum of P_MEM over all galaxies
RA_MMGGS double deg RA of Most Massive Group Galaxy within NFW scale radius
DEC_MMGGS double deg Dec of Most Massive Group Galaxy within NFW scale radius
ID_MMGGS long ID number of MMGGS in the COSMOS X-ray Group Member Galaxy Catalog
SM_MMGGS float log(M / Msun) Stellar mass of MMGGS
RA_MMGGS_ZBEST double deg RA_MMGGS using spectroscopic redshift
DEC_MMGGS_ZBEST double deg DEC_MMGGS using spectroscopic redshift
ID_MMGGS_ZBEST long ID_MMGGS using spectroscopic redshift
NAME char Name
XFLAG int X-ray quality flag