Physics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..251d&link_type=abstract
NOAO Proposal ID #2000B-0251
Physics
Scientific paper
Our large program goal is 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. We are proposing a short test to quantify the scattered light in the WIYN telescope, in order to leverage the data from large WIYN queue project from the 1999 spring season. We can estimate the amount of incident extragalactic ionizing radiation by measuring the H(alpha) surface brightness of extragalactic hydrogen clouds. 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 our target HI cloud place a lower limit on the ionizing background incident on the cloud. If WIYN systematics allow, we will make the first detection of H(alpha) emission from an extragalactic cloud, and thus actually measure the local extragalactic EUV ionizing background.
Aldering Greg
Donahue Megan
Stocke John
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