EURD observations of interstellar radiation

Details EURD observations of interstellar radiation EURD observations of interstellar radiation

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.276..177e&link_type=abstract

Astrophysics and Space Science, v. 276, Issue 1, p. 177-185 (2001).

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

The hot interstellar medium (ISM) has far-reaching effect upon the structure of galaxies. Although ISM heating processes are fairly well understood, after decades of study, the processes that cool the hot interstellar medium remain obscure. The EURD spectrograph was designed to measure the diffuse cosmic background from 350 to 1100 Å in order to study the hot ISM and the mechanisms by which it sheds its energy. We present the first analysis of EURD observations of the cosmic background. These EURD observations have proven to be far more sensitive than previous work; compared to previous results, we have improved the limits to the intensity of 450 to 900 Å line emission from the ISM by one to two orders of magnitude. Our limit to OVI 1032 Å / 1038 Å doublet of 7900 ph s^-1 cm^-2 str^-1 is the lowest yet reported. The EURD limits to line emission are less intense than predicted by a variety theoretical models of the local ISM.

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