ROSAT PSPC observations of globular clusters

Details ROSAT PSPC observations of globular clusters ROSAT PSPC observations of globular clusters

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..763j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. 763-774

Astronomy and Astrophysics

Astrophysics

34

Globular Clusters, Interstellar Extinction, X Ray Density Measurement, X Ray Imagery, X Ray Sources, Color-Color Diagram, Data Reduction, Image Processing, Luminosity, Rosat Mission

Scientific paper

We present deep pointed observations of nine globular clusters obtained with the Rosat position-sensitive proportional counter (PSPC). The clusters observed were selected to be nearby, have low interstellar absorption towards them, and to have high collision number. X-ray sources are detected in the cores of seven of them, at luminosities of approximately 1 - 6 x 1032 erg/s. At least two of these are multiple. The sources are too dim to obtain spectra of them, but analysis of the X-ray colors indicates that their spectra are not all identical. Four of the seven have colors indicating soft spectra, with blackbody temperature kappa T less than or approximately = 0.3 keV. Soft spectra can be excluded for the other three sources.

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