Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..361p&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)361-(12)364
Astronomy and Astrophysics
Astronomy
Astronomical Models, Extreme Ultraviolet Radiation, Flux Density, Luminosity, Spiral Galaxies, Supernovae, Ultraviolet Astronomy, X Ray Spectra, Brightness, Cameras, Heao 2, Interstellar Extinction, Interstellar Matter, Rosat Mission, Sky Surveys (Astronomy), Star Formation, X Ray Astronomy
Scientific paper
Using data from the Wide Field Camera (WFC) EUV all-sky survey, we have established upper limits to the EUV flux from a sample of 30 bright, nearby, non-active spiral galaxies. These galaxies were chosen to be those most likely to be detected in the EUV on the basis of: (1) low interstellar absorption within our own galaxy; (2) brightness in other wavebands; (3) high star formation activity; and (4) proximity. The derived EUV upper limits are restrictive, and establish for the first time that the EUV flux escaping from galaxies does not constitute a major component of their bolometric luminosity, and in particular that it cannot be the sink for the energy injected into the interstellar medium by supernova explosions, as had been suggested following the failure to detect this power in the X-ray band.
Ponman Trevor J.
Read Andrew M.
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