On the possibility of detecting very hot gas through absorption-line studies

Details On the possibility of detecting very hot gas through absorption-line studies On the possibility of detecting very hot gas through absorption-line studies

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264...49y&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 1, 1983, p. 49-52.

Astronomy and Astrophysics

Astronomy

8

Absorption Spectra, High Temperature Gases, Intergalactic Media, Interstellar Gas, X Ray Spectra, Crab Nebula, Heao 2, X Ray Absorption, X Ray Astronomy

Scientific paper

The possibility of detecting hot (T greater than or approximately equal to 10 to the 6th K) diffuse interstellar and intergalactic gas through absorption-line studies is assessed. Optical studies of semiforbidden lines are shown to be just beyond feasibility. X-ray absorption-line studies are concluded to be within the capability of future soft X-ray spectrographs, however. In particular, it is shown that the Bragg crystal spectrometer aboard Einstein could possibly have been used to detect O VII and O VIII lines against the Crab if they are present at plausible levels. Improvement of instrument parameters by only a small factor could make this the most important method available for studying hot interstellar, galactic halo and possibly even intergalactic gas.

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