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