Discovery of multiple X-ray sources in 47 Tucanae

Details Discovery of multiple X-ray sources in 47 Tucanae Discovery of multiple X-ray sources in 47 Tucanae

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..466h&link_type=abstract

Astronomy and Astrophysics 288, 466-471 (1994)

Astronomy and Astrophysics

Astrophysics

41

Globular Clusters: General, 47 Tuc, X-Rays: Stars

Scientific paper

Two Rosat HRI observations of 47 Tuc were obtained with a one year interval. Four X-ray sources are detected within the core of 47 Tuc in the first observation. Two of these, and one new source are detected in the core a year later. The positions of two sources are compatible with the position of the X-ray source detected with the Einstein satellite. Four additional sources are detected outside the core, but within 4 core radii; several of these are expected to be cluster members as well. The luminosities of the core sources (L_x_=~10^33^erg/s) are higher than those observed with Rosat of cataclysmic variables, but are in the range observed for soft X-ray transients in quiescence. In addition to the point sources, extended emission is detected out to several core radii; this may be the conglomerate emission of a number of low-luminosity sources.

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