HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.

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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

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Last modified: Friday, 23-Aug-2024 13:20:40 EDT

HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.