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Toward the Virgo Cluster: On the Study of Neutral Hydrogen in the Local Universe

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dc.contributor.authorKent, Brian
dc.date.accessioned2008-07-15T19:48:24Z
dc.date.available2012-08-10T06:11:17Z
dc.date.issued2007-08-10
dc.descriptionRiccardo Giovanelli, Martha P. Haynes, Robert L. Brown, Eanna Flanagan, Richard V. E. Lovelaceen_US
dc.description.abstractA catalog of neutral hydrogen detections toward the Virgo cluster has been assembled. The data set uses observations from the Arecibo Legacy Fast ALFA (ALFALFA) survey, a large extragalactic survey project using the new multi-beam receiver at the Arecibo Observatory. The survey is an ongoing effort and will eventually cover 7000 square degrees of high galactic latitude sky. The technical background, observing mode, and data reduction procedures will be described. The catalog of HI detections and their associated distributions and statistics will be discussed. A number of unique HI detections from the catalog appear to have interesting properties. Some appear associated with, but offset from, low surface brightness optical counterparts; others, at larger spatial offsets, may be tidally related to optical counterparts. Yet another class includes detections which are not identifiable with any optical emission available in online imaging databases. The preliminary ALFALFA results on these objects in the Virgo region, as well as followup aperture synthesis observations obtained with the Very Large Array, will be described. These gas-rich, optically dim objects are not detected in large numbers and are likely not primordial in nature. We explore scenarios pertaining to their origin from ram pressure stripping of large disk galaxies in a cluster environment. We also briefly discuss an HI mass function for the Virgo HI detections, as well as preliminary simulations of a disk galaxy moving at high speed through a cluster environment. The summary of results will include future endeavors with high-velocity clouds and mapping of galactic neutral hydrogen.en_US
dc.description.sponsorshipNational Astronomy and Ionosphere Center, National Radio Astronomy Observatory, National Virtual Observatory, AST--0307661, AST--0435697, AST--0347929, AST--0407011, AST--0302049en_US
dc.identifier.citationKent, B.R. et al. 2007, Astrophys. J. (Letters) 665, L15en_US
dc.identifier.otherbibid: 6397195
dc.identifier.urihttps://hdl.handle.net/1813/11113
dc.language.isoen_USen_US
dc.publisherAstrophysical Journalen_US
dc.subjectastronomyen_US
dc.subjectastrophysicsen_US
dc.subjectradio astronomyen_US
dc.subjectArecibo Telescopeen_US
dc.subjectVery Large Arrayen_US
dc.subjectneutral hydrogenen_US
dc.subjectgalaxyen_US
dc.subjectgalaxy clustersen_US
dc.subjectspectroscopyen_US
dc.subjectgas dynamicsen_US
dc.subjectastronomy surveysen_US
dc.subjectextragalactic astronomyen_US
dc.subjectuniverseen_US
dc.titleToward the Virgo Cluster: On the Study of Neutral Hydrogen in the Local Universeen_US
dc.typedissertation or thesisen_US

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