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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1458
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dc.contributor.authorDwarakanath, K.S.-
dc.contributor.authorCarilli, C.L.-
dc.contributor.authorGoss, W.M.-
dc.date.accessioned2006-08-30T06:40:05Z-
dc.date.available2006-08-30T06:40:05Z-
dc.date.issued2002-03-10-
dc.identifier.citationAstrophysical Journal, 2002, Vol.567, p940-946en
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357(Online)-
dc.identifier.urihttp://hdl.handle.net/2289/1458-
dc.descriptionOpen Access-
dc.description.abstractUsing the Westerbork Synthesis Radio Telescope, we have detected H I 21 cm line absorption in the warm neutral medium of the Galaxy toward the extragalactic source 3C 147. This absorption, at a local standard of rest (LSR) velocity of -29+/-4kms-1 with a full width at half-maximum of 53+/-6kms-1, is associated with the Perseus arm of the Galaxy. The observed optical depth is (1.9+/-0.2)×10-3. The estimated spin temperature of the gas is 3600+/-360K. The volume density is 0.4 cm-3 assuming pressure equilibrium. Toward two other sources, 3C 273 and 3C 295, no wide H I 21 cm line absorption was detected. The highest of the 3 σ lower limits on the spin temperature of the warm neutral medium is 2600 K. In addition, we have also detected H I 21 cm line absorption from high-velocity clouds in the outer arm toward 3C 147 and 3C 380 at LSR velocities of -117.3, -124.5, and -113.7 km s-1, respectively. We find two distinct temperature components in the high-velocity clouds with spin temperatures of greater than 1000 K and less than 200 K, respectively.en
dc.format.extent171001 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherThe University of Chicago Press for the American Astronomical Societyen
dc.relation.urihttp://dx.doi.org/10.1086/338755en
dc.rights(2002) by the American Astronomical Society.en
dc.subjectGalaxy: Disk,en
dc.subjectGalaxy: Fundamental Parameters,en
dc.subjectISM: Atoms,en
dc.subjectISM: Structure,en
dc.subjectRadio Lines: ISMen
dc.titleDetection of HI 21 centimeter line absorption in the warm neutral medium and in the outer arm of the galaxyen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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