Skip to main content

The NASA/GSFC network is currently experiencing intermittent issues that affect our services. We are working on it and apologize for the inconvenience.
The offline tool hark (also on github) can be used to find and download data from the cloud.

Xspec Home Page

next up previous contents
Next: compLS: Comptonization, Lamb & Up: Additive Model Components Previous: cie, vcie, vvcie, bcie,   Contents


compbb: Comptonization, black body

Comptonized blackbody model by Nishimura, Mitsuda and Itoh (1986, PASJ 38, 819). The electron temperature should normally be kept fixed since the Compton $y$ parameter is the product of the electron temperature and optical depth.

par1 blackbody temperature (keV)
par2 electron temperature of the hot plasma (keV)
par3 optical depth of the plasma
norm $(L_{39}/D_{10})^2$, where $L_{39}$ is the source luminosity in units of $10^{39}$ erg/s and $D_{10}$ is the distance to the source in units of 10 kpc (the same definition used for the bbodyrad model)