Chitnis, V. R. ; Rao, A. R. ; Agrawal, P. C. ; Manchanda, R. K. (1993) Hard X-ray spectrum of 4U 1907+ 09 Astronomy & Astrophysics, 268 (2). pp. 609-614. ISSN 0004-6361
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Abstract
We have studied the binary X-ray source 4U 1907+09 in the energy range 20-100 keV, using a Xenon-filled multi-layer proportional counter (XMPC) telescope flown with balloons from Hyderabad (India) in 1985 and 1991. Results of these observations are reported. The source was detected above 20 keV at a significance level of 13σ in 1985 and marginally detected in 1991 when the flux was four times lower than that on the first occasion. A search for pulsation period near 437.5 s, observed in low energy X-rays, gave null result. Energy spectrum between 20 and 100 keV obtained in 1985 is fitted with a power law of photon index 1.4.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to EDP Sciences. |
| Keywords: | Binary X Ray Source; Balloon Observation; X Ray Spectrum; Hard X Ray; Period; Energy Spectrum; Power Law; Periodicity |
| ID Code: | 85557 |
| Deposited On: | 03 Mar 2012 14:45 |
| Last Modified: | 03 Mar 2012 14:45 |
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