A First Measurement of the Local EUV Ionizing Background

Details A First Measurement of the Local EUV Ionizing Background A First Measurement of the Local EUV Ionizing Background

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..352d&link_type=abstract

NOAO Proposal ID #1999A-0352

Physics

Scientific paper

We propose to make the first measurement of the level of the local extragalactic ionizing background radiation by obtaining deep, wide- field, narrowband H(alpha) images of an extragalactic H I cloud near the quasar 3C232 using a custom filter and the WIYN Imager. This project is an extension of previous observations at KPNO. We are able to estimate the amount of incident ionizing radiation by measuring the H(alpha) surface brightness contrasted against the sky. To date, this technique has produced one of the most direct observational limits on the low redshift EUV background, as well as new observations of low surface brightness emission in the halos of nearby edge-on spiral galaxies. New HST absorption line spectra of 3C232 through this cloud place a lower limit on the EUV background, and give us confidence that we will make the first detection of H(alpha) emission from an extragalactic cloud, and thus actually measure the local extragalactic EUV ionizing background.

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