Inclination Effects and Beaming in Black Hole X‐Ray Binaries
McClintock, Jeffrey E.
MetadataShow full item record
CitationNarayan, Ramesh, and Jeffrey E. McClintock. 2005. “Inclination Effects and Beaming in Black Hole X‐Ray Binaries.” The Astrophysical Journal 623 (2): 1017–25. https://doi.org/10.1086/428709.
AbstractWe investigate the dependence of observational properties of black hole X-ray binaries on the inclination angle i of their orbits. We find the following: ( 1) Transient black hole binaries show no trend in their quiescent X-ray luminosities as a function of i, suggesting that the radiation is not significantly beamed. This is consistent with emission from an accretion disk. If the X-rays are from a jet, then the Lorentz factor gamma of the jet is < 1.24 at the 90% confidence level. ( 2) The X-ray binary 4U 1543 - 47 with i similar to 21 degrees has a surprisingly strong fluorescent iron line in the high soft state. Quantifying an earlier argument by Park et al., we conclude that if the continuum X-ray emission in this source is from a jet, then gamma < 1.04. (3) None of the known binaries has cos i < 0.25 or i > 75 degrees. This fact, plus the lack of eclipses among the 20 black hole binaries in our sample, strongly suggests at the 99.5% confidence level that systems with large inclination angles are hidden from view. The obscuration could be the result of disk flaring, as suggested by Milgrom for neutron star X-ray binaries. ( 4) Transient black hole binaries with i similar to 70 degrees - 75 degrees have significantly more complex X-ray light curves than systems with i less than or similar to 65 degrees. This may be the result of variable obscuration and/or variable height above the disk of the radiating gas.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41384967
- FAS Scholarly Articles