论文信息 - 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

We present a two-dimensional version of the classical one-dimensional Kolmogorov‐Smirnov (KS) test, extending an earlier idea due to Peacock and an implementation proposed by Fasano and Franceschini. The two-dimensional KS test is used to optimize 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.

S. Metchev | J. Z. C. I. O. Technology | H. C. F. Astrophysics

[1] R. Fisher. The Advanced Theory of Statistics , 1943, Nature.

[2] H. Lilliefors. On the Kolmogorov-Smirnov Test for Normality with Mean and Variance Unknown , 1967 .

[3] William H. Richardson,et al. Bayesian-Based Iterative Method of Image Restoration , 1972 .

[4] J. Grindlay,et al. An X-ray survey of globular clusters and their X-ray luminosity function. , 1983 .

[5] J. Peacock. Two-dimensional goodness-of-fit testing in astronomy , 1983 .

[6] G. Fasano,et al. A multidimensional version of the Kolmogorov–Smirnov test , 1987 .

[7] F. A. Seiler,et al. Numerical Recipes in C: The Art of Scientific Computing , 1989 .

[8] William H. Press,et al. The Art of Scientific Computing Second Edition , 1998 .

[9] Georges Meylan,et al. Structure and dynamics of globular clusters , 1993 .

[10] A. Cool,et al. Discovery of candidate cataclysmic variables in the post-core-collapse globular cluster NGC 6397 , 1995 .

[11] Antonio Maggio,et al. A Method Based on Wavelet Transforms for Source Detection in Photon-counting Detector Images. I. Theory and General Properties , 1997 .

[12] G. Hasinger,et al. Spatial corrections of ROSAT HRI observations , 1998, astro-ph/9811121.

[13] Cataclysmic Variables and a Candidate Helium White Dwarf in the Globular Cluster NGC 6397 , 1998, astro-ph/9811138.

[14] Magnetic CVs in Globular Clusters , 1999, astro-ph/9901356.