The Spectral Features of Disk and Corona with Mass Evaporation in the Low/Hard State

Details The Spectral Features of Disk and Corona with Mass Evaporation in the Low/Hard State The Spectral Features of Disk and Corona with Mass Evaporation in the Low/Hard State

2010-07-05

arxiv.org/abs/1007.0640v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

11 pages and 7 figures, published by PASJ

Scientific paper

We investigate the spectral features of accretion flows composed of an outer cool, optically thick disk and inner hot, optically thin, advection dominated accretion flows (ADAF) within the framework of disk and corona with mass evaporation (Liu et al. 2002a). In this work, both the magnetic field and Compton scattering of soft photons from the disk by electrons in the corona are included to calculate the evaporation rates at different distances. The disk is truncated at the distance where the evaporation rate equals to the accretion rate ($\dot m_{\rm evap}(r_{\rm tr})=\dot m$). For a series of accretion rates, the corresponding truncation radii are calculated out, with which we are able to calculate the emergent spectra from the inner ADAF + outer disk + corona. At very low accretion rates, the spectra are similar to that of a pure ADAF because the disk is truncated at large distances. The disk component becomes important at high accretion rates since the truncation occurs at small distances. An anti-correlation between the Eddington ratio $\xi \equiv L_{\rm 0.5-25 \,keV}/L_{\rm Edd}$ and the hard X-ray photon index $\Gamma_{\rm 3-25 \,keV}$ at low/hard states is predicted by the model. Comparing the theoretical results with observations, we find that our model can reproduce the anti-correlation between the Eddington ratio $\xi$ and the hard X-ray photon index observed for the X-ray binary XTE J1118+480.

Affiliated with

Also associated with

No associations

Rating

The Spectral Features of Disk and Corona with Mass Evaporation in the Low/Hard State 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 The Spectral Features of Disk and Corona with Mass Evaporation in the Low/Hard State, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Spectral Features of Disk and Corona with Mass Evaporation in the Low/Hard State will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-594651