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Asca Observations of the Galactic Bulge Hard X-ray Source Grs 1758[258
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hook. f. |
| Copyright Year | 1997 |
| Abstract | GRS 1758[258 is one of the few persistent hard X-ray emitters (E[ 100 keV) in the Galaxy. Using the ASCA satellite, we have obtained the Ðrst detailed data on GRS 1758[258 in the 1È10 keV range, where previous observations were a†ected by confusion problems caused by the nearby strong source GX 5[1. The spectrum is well described by a power law with photon index 1.7 without strong Fe emission lines. A prominent soft excess, as observed with ROSAT when the hard X-ray Ñux was in a lower intensity state, was not detected. However, the presence of a soft spectral component, accounting for at most 5% of the 0.1È300 keV Ñux, cannot be excluded. The accurate measurement of interstellar absorption cm~2] corresponds to an optical extinction that deÐnitely excludes the [NH \ (1.5^ 0.1) ] 1022 presence of a massive companion. Subject headings : black hole physics È stars : individual (GRS 1758[258) È X-rays : stars |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://pure.uva.nl/ws/files/3435711/2444_24942y.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
