Toward Understanding the Spectral Energy Distribution of Microquasars. I. Multiwavelength Properties of XTE J1550--564

Details Toward Understanding the Spectral Energy Distribution of Microquasars. I. Multiwavelength Properties of XTE J1550--564 Toward Understanding the Spectral Energy Distribution of Microquasars. I. Multiwavelength Properties of XTE J1550--564

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0704x&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #07.04; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We report results from a systematic study of the spectral energy distribution (SED) of XTE J1550--564. The main objectives include: 1) assessing the roles of jets and accretion flows; 2) disentangling variabilities associated with the jets and accretion flows and quantifying the coupling between the two; and 3) re-examining the concepts of spectral states, state transitions, and spectral hysteresis. The jets of XTE J1550--564 have been directly imaged at X-ray energies. We began by applying a synchrotron model to the broadband SED of the western ``blob'' (in the jets), to constrain the SED of radiating electrons in the ``blob''. Assuming that the electron distribution is the same for all ``blobs'', we then applied the model to the overall radio spectrum of the source and extrapolated the best fits to higher frequencies. Dispite of significant degeneracy in the fits, it seems clear that the synchrotron radiation from the jet contributes little to the observed X-ray emission, when the source is relatively bright. Assuming that the X-ray emission originated mostly from the accretion flows, we took an empirical approach to model the X-ray spectrum and study its evolution. From the compilation of the SEDs of XTE J1550--564, we found it straightforward to define spectral states based on the shape of SEDs and visualize transitions between various states thus defined. There is evidence for spectral hysteresis associated with the rise and fall of the 2000 outburst. Comparing outbursts of varying magnitude, we can also see that a specific state transition may occur at different fluxes. We also examined the radio/X-ray correlation of the source. While a rough correlation seems to be present, it is a fairly loose one. The implication of the results is discussed.
This work was supported by NASA Grants NAG5-9998, NNG04GI54G, and NNG05GF91G, and by NSFC Grants 10473001 and 10525313.

Affiliated with

Also associated with

No associations

Rating

Toward Understanding the Spectral Energy Distribution of Microquasars. I. Multiwavelength Properties of XTE J1550--564 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Toward Understanding the Spectral Energy Distribution of Microquasars. I. Multiwavelength Properties of XTE J1550--564, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Toward Understanding the Spectral Energy Distribution of Microquasars. I. Multiwavelength Properties of XTE J1550--564 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1154753