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Detection of HI 21cm Absorption by the Warm Neutral Medium | | C.L. Carilli
; K.S. Dwarakanath
; W.M. Goss
; | | Date: |
13 May 1998 | | Journal: | Astrophys.J. 502 (1998) L79 | | Subject: | astro-ph | | Affiliation: | NRAO), K.S. Dwarakanath (RRI), W.M. Goss (NRAO | | Abstract: | We have detected HI 21cm 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 K and 4800+/-1600 K, respectively. The volume filling factor for the WNM appears to be fairly high (f = 0.4). | | Source: | arXiv, astro-ph/9805172 | | Services: | Forum | Review | PDF | Favorites | |
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