Broadband spectrum of the X-ray nova SWIFT J174510.8-262411 at the decaying phase of its outburst
Abstract
Results of quasi-simultaneous SWIFT and RTT-150 observations for the X-ray nova SWIFT J174510.8-262411 in May-June 2013 at the decaying phase of its outburst are presented. It is shown that the nova spectrum can be fitted in a very wide energy range (from the infrared z and i bands to hard X-rays) by a single power law attenuated due to absorption but without any traces of the presence of a soft (blackbody) component. The presence of such a component is suggested by the generally accepted models of disk accretion onto a black hole in a binary system. The observation of a single power-law spectrum may imply that synchrotron radiation from the source's relativistic jets makes a major contribution to its flux or that the accretion disk is everywhere hot, optically thin, and radiates nonthermally.
- Publication:
-
Astronomy Letters
- Pub Date:
- April 2014
- DOI:
- 10.1134/S106377371404001X
- Bibcode:
- 2014AstL...40..171G
- Keywords:
-
- X-ray sources;
- transients;
- black holes;
- spectral states;
- disk accretion