Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..421a&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 4, p. 421-433.
Astronomy and Astrophysics
Astronomy
12
H Ii Regions, Millimeter Waves, Radio Emission, Cosmic Dust, Emission Spectra, Radio Sources (Astronomy), Very Large Array (Vla)
Scientific paper
Millimeter-wave continuum sources in the NGC 7538 region were observed with the NRO 45-m telescope and Nobeyama Millimeter Array (NMA). NRO 45-m telescope observations showed that the compact region which includes IRS1, 2, and 3 has a strong millimeter-wave intensity excess. This region was also studied with NMA at 49 and 98 GHz, and the obtained millimeter-wave spectrum was analyzed. It has been proposed from this analysis that new compact quasi-spherical and homogeneous H II sources may exist in the IRS1 region, rather than the VLA ultra-compact H II regions. It is suggested that the new sources have a small linear size, of the order of 10 exp 15 cm, and a high electron density of about 10 exp 7/cu cm; they are still optically thick, even in the 100 GHz range. This gives an H II evolution time as short as about 100 yr. These small, but intense, H II emission sources in IRS1 may well be identified by cocoon stars.
Akabane Kenji
Inoue Makoto
Ishiguro Masato
Kameya Osamu
Kawabe Ryohei
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