Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343l..41j&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. L41-L44.
Astronomy and Astrophysics
Astronomy
26
Ammonia, Interstellar Chemistry, Interstellar Masers, Very Large Array (Vla), Brightness Temperature, Continuous Spectra, H Ii Regions, Image Processing, Infrared Sources (Astronomy)
Scientific paper
Emission in the (J, K) = (3, 3) inversion line of ortho- (N-15)H3 associated with NGC 7538 IRS 1 has been found to be coincident with the continuum peak emission. The brightness temperature of the most intense feature, at -60 km/s, is larger than 5200 K. This maser emission may be due to amplification of the background H II region. The maser emission arises from many discrete sources distributed over a north-south extent of roughly 0.3 arcsec. The (N-15)H3, H2CO, and OH (1665 MHz) emission probably all originate in a common highly clumped compact region that is in front of the H II region. The H II region appears to be optically thick at centimeter wavelengths and maser emission from these molecules may be a good probe of neutral gas near ultracompact H II regions.
Henkel Carsten
Johnston Ken J.
Mauersberger Rainer
Stolovy Susan Renee
Wilson Thomas L.
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