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: xion: reflected spectrum of Up: Multiplicative Model Components Previous: wabs, zwabs: photoelectric absorption,   Contents


wndabs, zwndabs: photo-electric absorption, warm absorber

Photo-electric absorption from approximation to a warm absorber using Balucinska-Church & McCammon (1992) cross-sections. Relative abundances are set by the abund command.

$\displaystyle M(E) = \begin{array}{ll} 1 & E > E_w \\ [.2cm]\exp[-\eta_H\sigma(E)] & E \leq E_w \end{array}$

where $\sigma(E)$ is the photo-electric cross-section (NOT including Thomson scattering) and

par1=$\eta_H$ equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)
par2=$E_w$ window energy (keV)

The zwndabs variant allows the user to specify a (fixed) redshift and uses the corresponding formula:

$\displaystyle M(E) = \begin{array}{ll} 1 & E > E_w \\ [.2cm]\exp[-\eta_H\sigma(E[1+z])] & E \leq E_w \end{array}$

with parameters:

par1=$\eta_H$ equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)
par2=$E_w$ window energy (keV)
par3=z redshift