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http://hdl.handle.net/20.500.12386/27585
Titolo: | The XXL Survey. XXIV. The final detection pipeline | Autori: | Faccioli, L. Pacaud, F. Sauvageot, J. -L. Pierre, M. CHIAPPETTI, LUCIO Clerc, N. Gastaud, R. Koulouridis, E. Le Brun, A. M. C. Valotti, A. |
Data pubblicazione: | 2018 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 620 | Da pagina:: | A9 | Abstract: | Aims: A well characterised detection pipeline is an important ingredient for X-ray cluster surveys. <BR /> Methods: We present the final development of the XXL Survey pipeline. The pipeline optimally uses X-ray information by combining many overlapping observations of a source when possible, both for its detection and its characterisation. It can robustly detect and characterise several types of X-ray sources: AGNs (point-like), galaxy clusters (extended), galaxy clusters contaminated by a central AGN, and pairs of AGNs close on the sky. We perform a thorough suite of validation tests via realistic simulations of XMM-Newton images and we introduce new selection criteria for various types of sources that will be detected by the survey. <BR /> Results: We find that the use of overlapping observations allows new clusters to be securely identified that would be missed or less securely identified by using only one observation at a time. We also find that, with the new pipeline we can robustly identify clusters with a central AGN that would otherwise have been missed, and we can flag pairs of AGNs close on the sky that might have been mistaken for a cluster. | Note: | Part of the second data release of the XXL Survey. Associated data is accessible via CDS and via the XXL Database hosted at IASF-MI | URI: | http://hdl.handle.net/20.500.12386/27585 | URL: | https://www.aanda.org/articles/aa/full_html/2018/12/aa32931-18/aa32931-18.html https://arxiv.org/abs/1809.05036 |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201832931 | Bibcode ADS: | 2018A&A...620A...9F | Fulltext: | open |
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