A persistent hard X-ray source observed in the Terzan 1 globular cluster by the SIGMA telescope.

Details A persistent hard X-ray source observed in the Terzan 1 globular cluster by the SIGMA telescope. A persistent hard X-ray source observed in the Terzan 1 globular cluster by the SIGMA telescope.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.249b&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.249-250

Astronomy and Astrophysics

Astrophysics

2

Globular Clusters: Individual: Terzan 1, Gamma-Rays: Observations

Scientific paper

A persistent hard X-ray emission has been observed by the SIGMA telescope in the Terzan 1 globular cluster. The photon spectrum is reproduced by a power law with spectral index equal to -3.2+/-0.7. The luminosity calculated in the 40-75keV energy range assuming a distance of 10kpc is equal to (4+/-0.8) 10^35^erg/s. This source is already known as an X-ray burster and has been studied by HEAO1, SL2-XRT, Exosat, Rosat and ART-P and it may be a LMXB with a neutron star as the compact member.

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