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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
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Abstract
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 |
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| 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 |
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