Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

ChaMP serendipitous galaxy cluster survey

Barkhouse, WA, Green, PJ, Vikhlinin, A, Kim, DW, Perley, DA, Cameron, R, Silverman, J, Mossman, A, Burenin, R, Jannuzi, BT, Kim, M, Smith, MG, Smith, RC, Tananbaum, H and Wilkes, BJ (2006) ChaMP serendipitous galaxy cluster survey. The Astrophysical Journal, 645 (2). ISSN 1538-4357

Barkhouse_2006_ApJ_645_955.pdf - Published Version

Download (816kB) | Preview


We present a survey of serendipitous extended X-ray sources and optical cluster candidates from the Chandra Multiwavelength Project (ChaMP). Our main goal is to make an unbiased comparison of X-ray and optical cluster detection methods. In 130 archival Chandra pointings covering 13 deg2, we use a wavelet decomposition technique to detect 55 extended sources, of which 6 are nearby single galaxies. Our X-ray cluster catalog reaches a typical flux limit of about ∼10-14 ergs cm-2 s-1, with a median cluster core radius of 21′. For 56 of the 130 X-ray fields, we use the ChaMP's deep NOAO 4 m MOSAIC g′, r′, and i′ imaging to independently detect cluster candidates using a Voronoi tessellation and percolation (VTP) method. Red-sequence filtering decreases the galaxy fore- and background contamination and provides photometric redshifts to z ∼ 0.7. From the overlapping 6.1 deg2 X-ray/optical imaging, we find 115 optical clusters (of which 11% are in the X-ray catalog) and 28 X-ray clusters (of which 46% are in the optical VTP catalog). The median redshift of the 13 X-ray/optical clusters is 0.41, and their median X-ray luminosity (0.5-2 keV) is LX = (2.65 ± 0.19) × 1043 ergs s -1. The clusters in our sample that are only detected in our optical data are poorer on average (∼4 σ) than the X-ray/optically matched clusters, which may partially explain the difference in the detection fractions. © 2006. The American Astronomical Society. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 18 May 2017 08:11
Last Modified: 04 Sep 2021 11:34
DOI or ID number: 10.1086/504457
URI: https://researchonline.ljmu.ac.uk/id/eprint/6454
View Item View Item