Shimura and Takahara accretion disk modelThis is the X-ray accretion disk spectral model by Shimura and Takahara 1995, ApJ, 445, 780. The code was developed by Toshiya Shimura (tshimura@ynu.ac.jp), and the FITS file was made by Ken Ebisawa (ebisawa@milkyway.gsfc.nasa.gov). There are two parameters, mass of the central object (solar mass unit), and accretion rate in the unit of Ledd/c2, where Ledd is the Eddington luminosity and c is the light velocity (the same unit in Shimura and Takahara 1995). Normalization is (10kpc/d)^2*cos i, where d is the distance, i is the disk inclination angle. Note, this disk spectral calculation is based on the formalism by Novikov and Thorne (1973), in which Riffert and Herold (1995, ApJ, 450, 508) later found a mistake. Effect of this mistake on the disk spectra is considered to be negligible, though.
Keith Arnaud, Lab. for High Energy Astrophysics, NASA/Goddard Space Flight Center HEASARC Home | Observatories | Archive | Calibration | Software | Tools | Students/Teachers/Public Last modified: Wednesday, 09-Feb-2005 18:22:49 EST The HEASARC welcomes your participation in a brief survey to capture how users access and utilize HEASARC data, software, and services. The outcome(s) of this survey will be used to guide, prioritize, and plan our activities and development in the coming years. It contains 20 questions, generally takes just a few minutes to complete, and your answers will remain totally anonymous. The survey is open until Dec 18, 2023. We thank you in advance for your valuable feedback. |
The HEASARC welcomes your participation in a brief survey to capture how users access and utilize HEASARC data, software, and services. The outcome(s) of this survey will be used to guide, prioritize, and plan our activities and development in the coming years. It contains 20 questions, generally takes just a few minutes to complete, and your answers will remain totally anonymous. The survey is open until Dec 18, 2023. We thank you in advance for your valuable feedback.
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