The Beppo-SAX View of X-ray Sources within Globular Clusters

Details The Beppo-SAX View of X-ray Sources within Globular Clusters The Beppo-SAX View of X-ray Sources within Globular Clusters

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.322g&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

The results of a Beppo-SAX observational campaign of luminous X-ray sources within globular clusters are presented. The targets observed so far are X1820-303 (in NGC6624), X1724-308 (in Terzan 2), X1850-086 (in NGC6712), in decreasing order of luminosity. The spectra are characterized by simple power-laws (photon spectral index {Gamma ~2}) and soft excesses below a few keV. A cutoff is required in X1820-303 (E_{cutoff ~= 8} keV) and X1724-308 (E_{cutoff ~= 90} keV), suggesting an origin from unsaturated thermal Comptonization. The soft excess can originate as a single temperature blackbody from the surface of the neutron star or as a multi-temperature one from the boundary layer between the accretion disk and the compact object. X1724-308 underwent a burst during the observation, which displays a high-energy (>= 10 keV) precursor with a double-peaked structure.

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