Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1416
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dc.contributor.authorCarilli, C.L.-
dc.contributor.authorDwarakanath, K.S.-
dc.contributor.authorGoss, W.M.-
dc.date.accessioned2006-07-07T06:33:29Z-
dc.date.available2006-07-07T06:33:29Z-
dc.date.issued1998-07-20-
dc.identifier.citationAstrophysical Journal Letters, 1998, Vol.502, p.L79-L83en
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357 (online)-
dc.identifier.urihttp://hdl.handle.net/2289/1416-
dc.description.abstractWe have detected H I 21 cm line absorption by the warm neutral medium (WNM) using the Westerbork synthesis radio telescope. The absorption was detected toward Cygnus A at LSR velocities of -40 and -70 km s ^{-1} . These two velocity ranges were previously identified as being relatively free of cold absorbing clouds. The measured optical depth for the WNM along the line of sight to Cygnus A is (8.9+/-1.9)x10^{-4} at -70 km s ^{-1} and (8.5+/-2.0)x10^{-4} at -40 km s ^{-1} , with corresponding spin temperatures of 6000+/-1700 and 4800+/-1600 K, respectively. The volume filling factor for the WNM appears to be fairly high ( f~0.4 ).en
dc.format.extent354921 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/10.1086/311483en
dc.rights(1998) by the American Astronomical Society.en
dc.subjectISM: STRUCTUREen
dc.subjectISM: ATOMS,en
dc.subjectGALAXY: FUNDAMENTAL PARAMETERSen
dc.subjectRADIO LINES: ISMen
dc.titleDetection of H I 21 centimeter absorption by the warm neutral mediumen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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