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Attenuation by ISM. Integration OFF.
This model calculates the transmission of the interstellar medium using the
description of the ISM absorption of Rumph, Bowyer, & Vennes 1994, AJ 107,
2108. It includes neutral He autoionization features.
Between 1.2398 and 43.655 Angstroms (i.e. in the 0.28-10 keV range) the model also
accounts for metals as described in Morrison & MacCammon 1983, ApJ 270,
119.
The code uses the best available photoionization cross-sections to date
from the atomic data literature and combines them in an arbitrary mixture of
the three ionic species: HI, HeI, and HeII.
The model assumes that the data are expressed in Angstroms.
This model provided courtesy of Pat Jelinsky.
ATTEN Parameters
| 1 |
hcol |
N(HI) column (atoms cm^-2) |
| 2 |
heiRatio |
N(HeI)/N(HI) |
| 3 |
heiiRatio |
N(HeII)/N(HI) |
See "ahelp integrate" for further information about
source model integration.
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