A two-dimensional Kolmogorov-Smirnov test for crowded field source detection: ROSAT sources in NGC 6397

Details A two-dimensional Kolmogorov-Smirnov test for crowded field source detection: ROSAT sources in NGC 6397 A two-dimensional Kolmogorov-Smirnov test for crowded field source detection: ROSAT sources in NGC 6397

2002-04-23

arxiv.org/abs/astro-ph/0204391v1

Mon.Not.Roy.Astron.Soc. 335 (2002) 73

Astronomy and Astrophysics

Astrophysics

12 pages, 6 figures, 6 tables. Accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05595.x

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.

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