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

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..263d&link_type=abstract

NOAO Proposal ID #1999B-0263

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 an accepted WIYN queue project from the 1999 spring season. We can estimate the amount of incident ionizing radiation by measuring the H(alpha) surface brightness of the ionized hydrogen cloud. 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. HST absorption line spectra of 3C232 through this particular 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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