E/SO Ridgeline and Optical Cluster Finding at High Redshift using Error Corrected Gaussian Mixture Model

Details E/SO Ridgeline and Optical Cluster Finding at High Redshift using Error Corrected Gaussian Mixture Model E/SO Ridgeline and Optical Cluster Finding at High Redshift using Error Corrected Gaussian Mixture Model

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2104h&link_type=abstract

American Astronomical Society, AAS Meeting #212, #21.04; Bulletin of the American Astronomical Society, Vol. 40, p.218

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Optical galaxy cluster finding is very efficient. Multicolor CCD photometry allows combined detection and redshift estimation for clusters across broad redshift ranges. However, the lack of precise information about galaxy positions along the line of sight leads to contamination by projection, which plagues both cluster detection and the measurement of their properties. The dominance of red sequence galaxies, tightly clustered along the E/S0 ridgeline, provides a powerful method for de-projecting field galaxies. As redshift increases, the location of the ridgeline in color space will evolve. Therefore, a good understanding on the evolution of the ridgeline across a wide range of redshift is indispensable for high redshift cluster finding. We developed an error corrected Gaussian Mixture Model to separate the red sequence galaxies cluster by cluster and measure the corresponding E/SO ridgelines. Using the identified the E/SO ridgeline clustering in color space, together with the projected NFW filter in ra/dec plane, we developed a cluster finding algorithm that reliably detects galaxy clusters across the redshift range from 0 to 1.4. We present details of this new algorithm, together with results from running it on both mock catalogs and real SDSS data.

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