Detection of a Hot Gaseous Halo around the Giant Spiral Galaxy NGC 1961
dc.contributor.author | Anderson, Michael E. | en_US |
dc.contributor.author | Bregman, Joel N. | en_US |
dc.date.accessioned | 2012-04-06T20:57:14Z | |
dc.date.available | 2012-04-06T20:57:14Z | |
dc.date.issued | 2011 | en_US |
dc.identifier.citation | Anderson, Michael E.; Bregman, Joel N. (2011). "Detection of a Hot Gaseous Halo around the Giant Spiral Galaxy NGC 1961." The Astrophysical Journal, vol. 737, 1, 22. <http://hdl.handle.net/2027.42/90759> | en_US |
dc.identifier.uri | http://stacks.iop.org/0004-637X/737/i=1/a=22 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/90759 | |
dc.description.abstract | Hot gaseous halos are predicted around all large galaxies and are critically important for our understanding of galaxy formation, but they have never been detected at distances beyond a few kpc around a spiral galaxy. We used the ACIS-I instrument on board Chandra to search for diffuse X-ray emission around an ideal candidate galaxy: the isolated giant spiral NGC 1961. We observed four quadrants around the galaxy for 30 ks each, carefully subtracting background and point-source emission, and found diffuse emission that appears to extend to 40-50 kpc. We fit _-models to the emission and estimate a hot halo mass within 50 kpc of 5 _ 10 9 M _ . When this profile is extrapolated to 500 kpc (the approximate virial radius), the implied hot halo mass is 1-3 _ 10 11 M _ . These mass estimates assume a gas metallicity of Z = 0.5 Z _ . This galaxy's hot halo is a large reservoir of gas, but falls significantly below observational upper limits set by pervious searches, and suggests that NGC 1961 is missing 75% of its baryons relative to the cosmic mean, which would tentatively place it below an extrapolation of the baryon Tully-Fisher relationship of less massive galaxies. The cooling rate of the gas is no more than 0.4 M _ yr –1 , more than an order of magnitude below the gas consumption rate through star formation. We discuss the implications of this halo for galaxy formation models. | en_US |
dc.publisher | IOP Publishing | en_US |
dc.title | Detection of a Hot Gaseous Halo around the Giant Spiral Galaxy NGC 1961 | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Physics | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/90759/1/0004-637X_737_1_22.pdf | |
dc.identifier.doi | 10.1088/0004-637X-737-1-22 | en_US |
dc.identifier.source | The Astrophysical Journal | en_US |
dc.owningcollname | Physics, Department of |
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