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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pcfabs, zpcfabs: partial covering fraction absorption

A partial covering fraction absorption. The relative abundances are set by the abund command.

$\displaystyle M(E) = f \exp[-\eta_H \sigma(E)] + (1-f) $
where $\sigma(E)$ is the photo-electric cross-section (NOT including Thomson scattering) (see phabs) and:

par1=$\eta_H$ equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)
par2=f dimensionless covering fraction $(0<f\leq 1)$

The redshifted variant zpcfabs is given by:

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

where $\sigma(E)$ is the photo-electric cross-section (NOT including Thomson scattering) (see phabs). Relative abundances are as for pcfabs. Parameters are:

par1=$\eta_H$ equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)
par2=f dimensionless covering fraction $(0<f\leq 1)$
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.