Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...462..754b&link_type=abstract
Astrophysical Journal v.462, p.754
Astronomy and Astrophysics
Astronomy
12
Galaxy: Globular Clusters: Individual Name: Terzan 1, Gamma Rays: Observations
Scientific paper
During the survey of the Galactic center region performed by the hard X-ray telescope SIGMA aboard the Granat space observatory, a persistent source coincident with the Terzan 1 globular cluster has been observed. This source may be associated with the persistent X-ray source X1732-304 studied by EXOSAT, ROSAT, and ART-P and with the X-ray burster source detected by Hakucho in Terzan 1. The source appears at the 5.5 σ level in the SIGMA images in the 40-75 keV energy range. There is no evidence for time variability, and the photon spectrum is reproduced by a thermal bremsstrahlung law with a temperature equal to 33+32-12 keV as well as by a power law with spectral index equal to -3.2±0.7. The luminosity in the 40-75 keV energy range is equal to 4.0±0.8 x 1035 ergs s-1, assuming a distance of 10 kpc. This hard X-ray emission may come from a low-mass X-ray binary with a neutron star as the compact member.
Borrel Vincent
Bouchet Laurent
Chulkov I.
Churazov Eugene
D'yachkov A.
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