Detection of H I 21 centimeter absorption by the warm neutral medium

Carilli, C.L.; Dwarakanath, K.S.; Goss, W.M.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1416

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DC Field	Value	Language
dc.contributor.author	Carilli, C.L.	-
dc.contributor.author	Dwarakanath, K.S.	-
dc.contributor.author	Goss, W.M.	-
dc.date.accessioned	2006-07-07T06:33:29Z	-
dc.date.available	2006-07-07T06:33:29Z	-
dc.date.issued	1998-07-20	-
dc.identifier.citation	Astrophysical Journal Letters, 1998, Vol.502, p.L79-L83	en
dc.identifier.issn	0004-637X	-
dc.identifier.issn	1538-4357 (online)	-
dc.identifier.uri	http://hdl.handle.net/2289/1416	-
dc.description.abstract	We 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.extent	354921 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	The University of Chicago Press for the American Astronomical Society	en
dc.relation.uri	http://dx.doi.org/10.1086/311483	en
dc.rights	(1998) by the American Astronomical Society.	en
dc.subject	ISM: STRUCTURE	en
dc.subject	ISM: ATOMS,	en
dc.subject	GALAXY: FUNDAMENTAL PARAMETERS	en
dc.subject	RADIO LINES: ISM	en
dc.title	Detection of H I 21 centimeter absorption by the warm neutral medium	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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