HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.

Search:

[Advanced Search]



next up previous contents Xspec Home Page
Next: kerrdisk: accretion disk line Up: Additive Model Components Previous: kerrbb, zkerrbb: multi-temperature blackbody


kerrd: optically thick accretion disk around a Kerr black hole

Optically thick extreme-Kerr disk model based on the same tranfer-function used in the laor Kerr disk-line model. Local emission is simply assumed to be the diluted blackbody. See Laor (1991) for an explanation of the transfer function. See Ebisawa et al. (2003) for examples of using this model.

par1 distance (kpc)
par2 spectral hardening factor, Tcol/Teff. Should be greater than 1.0, and considered to be 1.5–1.9 for accretion disks around a stellar-mass black hole. See, e.g., Shimura & Takahara (1995) 445, 780
par3 mass of the central object (solar unit)
par4 mass accretion rate ($10^{18}$ g/s)
par5 disk inclination angle (deg; 0 for face-on)
par6 inner radius (units of $GM/c^2$). 1.235 is the last stable orbit.
par7 outer radius (units of $GM/c^2$)
K normalization factor. should be fixed to 1.
next up previous contents Xspec Home Page
Next: kerrdisk: accretion disk line Up: Additive Model Components Previous: kerrbb, zkerrbb: multi-temperature blackbody
HEASARC Home | Observatories | Archive | Calibration | Software | Tools | Students/Teachers/Public
Last modified: Friday, 23-Aug-2024 13:20:40 EDT

HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.