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On the possibility of detecting very hot gas through absorption-line studiesThe 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.
Document ID
19830038050
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
York, D. G.
(Princeton University New Observatory, Princeton, NJ, United States)
Cowie, L. L.
(Princeton University New Observatory, Princeton, NJ; MIT, Cambridge, MA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
83A19268
Funding Number(s)
CONTRACT_GRANT: NGL-31-001-007
CONTRACT_GRANT: NAS5-23576
Distribution Limits
Public
Copyright
Other

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