Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..395d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 2, Nov. 1984, p. 395-398.
Astronomy and Astrophysics
Astrophysics
3
H Ii Regions, H Lines, Hydrogen Recombinations, Interstellar Gas, Molecular Clouds, Supernova Remnants, Carbon Monoxide, Electron Energy, Radial Velocity, Radio Spectra, Radio Telescopes, Spectral Resolution
Scientific paper
The SNR IC 443 (S 248) and the adjacent low density H II region S 249 were observed in the H 166-alpha and H 200-alpha lines. The complex seemed to be a good candidate to search for line emission differences in the direction of the SNR and of the H II region. A positive detection of the H 166-alpha line was obtained in S 249 above the (3-sigma) r.m.s. limit, while no detection was obtained in the SNR direction. This indicates that S 249 is not an extended foreground source in the direction of the SNR. In fact, if this were the case, the line temperature of IC 443 should be enhanced by stimulated emission. The radial velocity with respect to LSR of S 249, as deduced from the line center, is -5km/s. This velocity is in good agreement with that of the CO cloud associated with this region and with that of the 'preshock' molecular cloud associated to the SNR.
Donati-Falchi A.
Tofani Gianni
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