Multi-temperature disk blackbody with power-law dependence of temperature on radius
NOTE: This model is now in the Xspec release and this page is superceded by the Xspec manualA multiple blackbody disk model where local disk temperature T(r) is proportional to r^-p, where p is a free parameter. In the case of diskbb model (standard disk), p is 0.75, while p is expected to be smaller than 0.75 when radial advection is dominant. See discussion and examples in, e.g., Mineshige et al. 1994, ApJ, 426, 308, Hirano et al. 1995, ApJ, 446, 350, Watarai et al. 2000, PASJ, 52, 133, Kubota and Makishima 2004, ApJ, 601, 428, Kubota et al. 2005, ApJ, 631, 1062.
Update on 10/26/06 : the normalization was wrong in that it was 0.75/p times smaller than required. The correct normalization is obtained by multiplying 0.75/p to the normalization of the old version of the code. Since the disk radius is proportional to the square root of the normalization, and p can be as low as 0.5, the correct inner radius may be up to 1.11 time greater than the radius obtained from the old version of the code.
Keith Arnaud, Lab. for High Energy Astrophysics, NASA/Goddard Space Flight Center
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