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bremss, vbremss, zbremss: thermal bremsstrahlung

A thermal bremsstrahlung spectrum based on the Kellogg, Baldwin & Koch
(ApJ 199, 299) polynomial fits to the Karzas & Latter (ApJS 6, 167)
numerical values. A routine from Kurucz (private communication) is
used at the low temperature end. The He abundance is assumed to be 8.5
% of H by number.

The zbremss variant includes a choice of redshift and
vbremss allows the H to He abundance ratio to be varied.

For bremss:

par1 |
plasma temperature in keV |

norm |
, where
is the distance to the source (cm) and , are the
electron and ion densities (cm) |

For zbremss:

par1 |
plasma temperature in keV |

par2 |
z, redshift |

norm |
, where
is the distance to the source (cm) and , are the
electron and ion densities (cm) |

For vbremss:

par1 |
plasma temperature in keV |

par2 |
((note that the Solar ratio is
0.085) |

norm |
, where
is the distance to the source (cm) and , are the
electron and ion densities (cm) |

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