Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.2904m&link_type=abstract
American Astronomical Society, HEAD meeting #8, #29.04; Bulletin of the American Astronomical Society, Vol. 36, p.967
Astronomy and Astrophysics
Astrophysics
Scientific paper
The hard state of X-ray binaries (XRBs) is associated with a hard power law spectrum in the X-ray band, generally modeled via inverse Comptonization of thermal disk photons by a corona. This state is also associated with compact, continuous jets whose radio synchrotron emission is correlated with the hard X-rays. The exact nature of this relationship is still under debate, and an effective way of addressing this question is to model the entire broadband spectrum self-consistently. Depending on the location of the optically thick-to-thin break and the emitting particle distribution, jet synchrotron radiation can contribute significantly to the X-ray band, in addition to synchrotron self-Compton emission from near the base of the jets. We have imported our jet models into X-ray data analysis software to allow the simultaneous fitting of radio and IR data along with the traditional X-ray bands. We present the fits to broadband simultaneous data sets, including X-ray data from the Rossi XTE mission, for several XRBs, including Cyg X-1 and GX 339-4. Our best results show contributions from both direct synchrotron radiation as well as a strong SSC component. With the addition of line and reflection features, jet models provide as good a description of the X-ray data as thermal Comptonization models, while also addressing the radio/IR components. S.M. is supported by an NSF Astronomy & Astrophysics postdoctoral fellowship.
Markoff Sera
Nowak Maciej A.
Wilms Joern
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