Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adil...dr...02r&link_type=abstract
NCSA Astronomy Digital Image Library
Astronomy and Astrophysics
Astronomy
Scientific paper
The Westerbork Synthesis Radio Telescope (WSRT) and the Effelsberg 100 m telescope have been used to observe neutral hydrogen (HI) absorption and emission toward the historical supernova remnant (SNR) 3C 58 at an angular resolution of about 1'. An analysis of the data shows concentrations of HI emission 5-35 pc in size. These emission features have column densities in the range 1 to 4 x 10^20 per square cm, masses 20-1600 solar masses and brightness temperatures 15-35 K. This detection represents an observation of the clumpy neutral medium with scale sizes of a few tens of parsecs at distances of several kpc. One of the emission features was also observed in HI absorption toward 3C 58. For this feature, a spin temperature of about 90 K was derived. The fact that these emission features have relatively low temperatures suggests that they are components of the cold neutral medium. HI absorption observations from the WSRT have also revealed absorbing concentrations along the line of sight which have peak optical depths about 0.8 and linear sizes of about 0.4 pc. In agreement with earlier determinations, a kinematic distance to the SNR of 3.2 kpc has been derived.
Goss William Miller
Herbstmeier Uwe
Kalberla Peter M. W.
Roberts Daniel A.
Schwarz Ulrich J.
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