Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21823604b&link_type=abstract
American Astronomical Society, AAS Meeting #218, #236.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We use the 2MASS Redshift Survey (2MRS) sample of galaxies to refine the Kochanek et al. (2003) matched filter method of finding galaxy clusters, which takes into account each galaxy's position, magnitude, and redshift if available. The matched filter postulates a radial density profile, luminosity function, and line-of-sight velocity distribution for clusters. We use this method to search for clusters in the 2MRS sample, which is roughly complete to an extinction-corrected K-band magnitude of 13.25 and has spectroscopic redshifts for roughly 40% of the galaxies, including all brighter than K=11.25. We then use a stacking analysis to determine the average luminosity function, radial galaxy distribution, and velocity distribution of clusters in several richness classes, and use the results to update the parameters of the matched filter before repeating the cluster search. We also investigate the correlations between a cluster's richness and its velocity dispersion, its scale radius, and the magnitude of its brightest galaxy, using these relations to refine priors that are applied during the cluster search process. After the second cluster search iteration, we repeat the stacking analysis. We find a cluster luminosity function that fits a Schechter profile, though there is some evidence of an excess on the bright end due to a population of bright central galaxies. The radial number density of galaxies around a cluster center closely matches a projected NFW profile at intermediate radii, with deviations at small radii due to well-known centering issues and outside the virial radius due to the two-halo term. The velocity distributions are Gaussian in shape, with velocity dispersions that correlate strongly with richness. In addition, the scale radii correlate with richness, as do the brightest galaxy magnitudes (weakly).
et. al.
Blackburne Jeffrey A.
Kochanek Chris S.
No associations
LandOfFree
The Structure of 2MASS Galaxy Clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Structure of 2MASS Galaxy Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Structure of 2MASS Galaxy Clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1741979