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26 April 2024 |
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A two-dimensional Kolmogorov-Smirnov test for crowded field source detection: ROSAT sources in NGC 6397 | | Stanimir A. Metchev
; Jonathan E. Grindlay
; | | Date: |
23 Apr 2002 | | Journal: | Mon.Not.Roy.Astron.Soc. 335 (2002) 73 | | Subject: | astro-ph | | Affiliation: | California Institute of Technology, Harvard-Smithsonian Center for Astrophysics | | Abstract: | We present a two-dimensional version of the classical one-dimensional Kolmogorov-Smirnov (K-S) test, extending an earlier idea due to Peacock (1983) and an implementation proposed by Fasano & Franceschini (1987). The two-dimensional K-S test is used to optimise the goodness of fit in an iterative source-detection scheme for astronomical images. The method is applied to a ROSAT/HRI x-ray image of the post core-collapse globular cluster NGC 6397 to determine the most probable source distribution in the cluster core. Comparisons to other widely-used source detection methods, and to a Chandra image of the same field, show that our iteration scheme is superior in measuring statistics-limited sources in severely crowded fields. | | Source: | arXiv, astro-ph/0204391 | | Services: | Forum | Review | PDF | Favorites | |
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