"Counting all the SHEEP": A summary of the past and present work associated with ASCA’s The Search for the High-Energy Extragalactic Population (SHEEP) survey.

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dc.contributor.author Weinzirl, Timothy
dc.contributor.author Brotherton, Mike
dc.contributor.author Nandra, K.
dc.contributor.author Georgantopoulou, I.
dc.contributor.author Papadakis, I.
dc.date.accessioned 2005-05-10T21:28:42Z
dc.date.available 2005-05-10T21:28:42Z
dc.date.issued 2005-05-10T21:28:42Z
dc.identifier.uri http://hdl.handle.net/2092/233
dc.description Tim Weinzirl is a junior at Drake University, majoring in Physics and Astronomy. He presented this poster session at DUCURS (Drake University Conference on Undergraduate Research in the Sciences) held on the Drake campus on April 15, 2005. en
dc.description.abstract SHEEP is the Search for the High-Energy Extragalactic Population, a survey of X-rays sources found in 5-10 keV band images from the ASCA satellite. Because hard X-rays are difficult to obscure, SHEEP provides a largely unbiased accounting of the AGN population. We have been identifying SHEEP using new high-resolution Chandra images, and following up with deep optical imaging from Greece and near-infrared imaging from Wyoming. Spectral classifications are obtained at NOAO 4-meter telescopes. Our initial work shows a wide variety of optical classes, ranging from QSOs to optically normal galaxies (despite their high X-ray luminosities). We have also identified several high-redshift quasar pairs, which is intriguing given the size of the sample. Completion of identifications and classifications will permit us to finally "count the SHEEP" and provide a better picture of the AGN population and the sources contributing to the X-ray background. en
dc.description.sponsorship Sponsored by Drake University Office of the Provost, Drake University College of Arts and Sciences, Drake University College of Pharmacy, Iowa Space Grant Consortium/NASA, Drake University Departments of Biology, Chemistry, Environmental Science and Policy, Mathematics and Computer Science, Physics and Astronomy, and Psychology. en
dc.format.extent 573440 bytes
dc.format.extent 542519 bytes
dc.format.mimetype application/vnd.ms-powerpoint
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.relation.ispartofseries DUCURS 2005;1 en
dc.subject X-ray astronomy en
dc.subject Astrophysics en
dc.subject CHANDRA (Computer file) en
dc.subject ROSAT (Artifical satellite) en
dc.subject SHEEP survey en
dc.subject ASCA (Artificial satellite) en
dc.subject Active Galactic Nuclei (AGN) en
dc.title "Counting all the SHEEP": A summary of the past and present work associated with ASCA’s The Search for the High-Energy Extragalactic Population (SHEEP) survey. en
dc.type Presentation en


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  • DUCURS [196]
    Poster sessions and presentation from the Drake University Conference on Undergraduate Research in the Sciences held each April at Olmsted Center on the Drake campus.

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