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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edge, zedge: absorption edge

The edge model is absorption edge, given by

$\displaystyle M(E) = \begin{array}{ll} 1 & E \leq E_c\\ [.2cm]exp\left[-D(E/E_c)^{-3}\right] & E \geq E_c \end{array}$
where:

par1=$E_c$ threshold energy
par2=$D$ absorption depth at the threshold

The zedge model given by

$\displaystyle M(E) = \begin{array}{ll} 1 & E < E_c\\ [.2cm]exp\left(-D\left[E(1+z)/E_c\right]^3\right) & E > E_c \end{array}$
allows a redshift z where:

par1=$E_c$ threshold energy
par2=$D$ absorption depth at the threshold
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.