Skip to main content

To find and download HEASARC data in the cloud, you can use astroquery.heasarc or download our new tool, hark.

The HEASARC and NuSTAR teams are greatly saddened by the sudden passing of Katja Pottschmidt. Most recently Katja was the lead scientist for the NuSTAR Guest Observer Facility (GOF), a role she had supported for many years. During her science career she worked on many other high energy astrophysics missions and played an integral role in advancing our knowledge of the universe. She was a wonderful colleague and friend and will be keenly missed by all who knew her.

next up previous contents
Next: wndabs, zwndabs: photo-electric absorption, Up: Multiplicative Model Components Previous: vvoigtabs, zvvoigtabs: voigt absorption   Contents


wabs, zwabs: photoelectric absorption, Wisconsin cross-sections

A photo-electric absorption using Wisconsin (Morrison & McCammon 1983) cross-sections.

$\displaystyle M(E)=\exp[-\eta_H\sigma(E)] $

where $\sigma(E)$ is the photo-electric cross-section (NOT including Thomson scattering). Note that this model uses the Anders & Ebihara relative abundances (1982) regardless of the abund command.

par1=$\eta_H$ equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)

The zwabs variant allows the user to specify a (fixed) redshift parameter, and uses the corresponding formula

$\displaystyle M(E)=\exp[-\eta_H\sigma(E[1+z])] $

par1=$\eta_H$ equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)
par2=z redshift