SDSSWHLGC - Sloan Digital Sky Survey DR6 Galaxy Clusters Catalog
Galaxy Clusters Identified from the SDSS DR6 and Their Properties Wen Z.L., Han J.L., Liu F.S. <Astrophys. J. Suppl. 183, 197 (2009)> =2009ApJS..183..197W
The J2000.0 position-based source designation of the cluster of galaxies using the 'WHL' prefix (for Wen Han, Liu), and the coordinates of the cluster center. Notice that the HEASARC found 15 pairs of cases with duplicate names (including one pair with identical photometric redshifts as well), and added 'A' and 'B' suffixes to differentiate these otherwise duplicate names:
|Cluster Name | Photometric Redshift |WHL J072815.2+350037A| 0.3494 |WHL J072815.2+350037B| 0.3612 |WHL J080822.1+293007A| 0.3946 |WHL J080822.1+293007B| 0.3972 |WHL J092124.0+273835A| 0.5222 |WHL J092124.0+273835B| 0.6525 |WHL J093139.6+202323A| 0.1735 |WHL J093139.6+202323B| 0.1948 |WHL J100200.2+082629A| 0.2173 |WHL J100200.2+082629B| 0.2235 |WHL J101448.3+104411A| 0.1996 |WHL J101448.3+104411B| 0.2096 |WHL J101854.3-021019A| 0.2064 |WHL J101854.3-021019B| 0.2154 |WHL J120252.8+380214A| 0.4578 |WHL J120252.8+380214B| 0.4593 |WHL J125811.4+492245A| 0.4708 |WHL J125811.4+492245B| 0.5020 |WHL J133426.4+372722A| 0.2890 |WHL J133426.4+372722B| 0.3188 |WHL J134327.5+400726A| 0.2318 |WHL J134327.5+400726B| 0.2334 |WHL J135520.1+490106A| 0.4961 |WHL J135520.1+490106B| 0.4972 |WHL J151602.8+653707A| 0.3165 |WHL J151602.8+653707B| 0.3208 |WHL J155040.2+092314A| 0.3633 |WHL J155040.2+092314B| 0.3633 |WHL J155846.7+413157A| 0.3776 |WHL J155846.7+413157B| 0.3795
The Right Ascension of the cluster center in the selected equinox. This was constructed by the HEASARC from the name, which contains the position in J2000.0 cordinates, with the RA given to a precision of 0.1 seconds of time.
The Declination of the cluster center in the selected equinox. This was constructed by the HEASARC from the name, which contains the position in J2000.0 cordinates, with the Dec given to a precision of 1 arcsecond.
The Galactic Longitude of the cluster center.
The Galactic Latitude of the cluster center.
The Right Ascension of the brightest cluster galaxy (BCG) in the selected equinox. This was given in the reference paper table in J2000.0 coordinates and in degrees, to a precision of 10-5 degrees.
The Declination of the brightest cluster galaxy (BCG) in the selected equinox. This was given in the reference paper table in J2000.0 coordinates and in degrees, to a precision of 10-5 degrees.
The photometric redshift of the cluster.
The spectroscopic redshift of the brightest cluster galaxy.
The r-band magnitude of the brightest cluster galaxy.
The number of member galaxy candidates (N_gal) within 1 Mpc.
The cluster richness R, defined by the number of real member galaxies in the region, but subtracting contamination from foreground and background galaxies. See Section 2.2 of the reference paper for more details.
The gross galaxy number of the cluster. This is the number of luminous galaxies within the radius for member galaxy detection (galaxy_det_radius), after subtracting the background.
The radius for member galaxy detection, in Mpc. For many clusters, the radius of 1 Mpc is not the boundary of the luminous cluster galaxies. The boundary can be recognized from the number counts within annuli. See Section 2.2 of the reference paper for more details.
The summed r-band luminosity of the cluster, L_r, in units of solar luminosities.
The overdensity level of the cluster. This is defined as the difference between the actual number of galaxies with absolute r-band magnitude <= 21 within a radius of 0.5 Mpc and the average background number within the same radius and redshift range in multiples of the rms of the average background number. See Section 2.2 of the reference paper for more details
Other catalogs containing the cluster:
Abell: Abell 1958, ApJS, 3, 211; Abell et al. 1989, ApJS, 70, 1; Zwcl: Zwicky et al. 1968, Catalog of Galaxies and Clusters of galaxies; CE: Goto et al. 2002, AJ, 123, 1807; NSC: Gal et al. 2003, AJ, 125, 2064; NSCS: Lopes et al. 2004, AJ, 128, 1017; maxBCG: Koester et al. 2007, ApJ, 660, 239; RXC: Bohringer et al. 2000, ApJ, 129, 435; 2004, A&A, 425, 367.
The designation of the ROSAT X-ray candidate counterpart source.
The projected separation between the X-ray source and the cluster BCG (brightest cluster galaxy), in Mpc.
The ROSAT X-ray source count rate in the 0.1-2.4 keV energy band, in ct/s.