Detection of HI 21cm Absorption by the Warm Neutral Medium

Details Detection of HI 21cm Absorption by the Warm Neutral Medium Detection of HI 21cm Absorption by the Warm Neutral Medium

1998-05-13

arxiv.org/abs/astro-ph/9805172v1

Astrophys.J. 502 (1998) L79

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1086/311483

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).

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