Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.188..463w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 188, Aug. 1979, p. 463-479.
Astronomy and Astrophysics
Astronomy
114
Infrared Astronomy, Milky Way Galaxy, Astronomical Maps, Astronomical Models, Emission Spectra, Energy Distribution, Far Infrared Radiation, H Ii Regions, Masers, Nebulae, Spectrophotometry, Stellar Evolution
Scientific paper
Infrared observations of the NGC 7538 region at wavelengths from 1 micron to 1 mm are presented and analyzed with the aim of understanding both the large-scale structure of this region of current star formation and the properties of the individual compact objects within it. At far-infrared wavelengths (25-130 microns), emission is seen from the visible H II region, from the vicinity of the previously known maser sources and dust-embedded compact HII regions, and from a new region called NGC 7538(E). Coincident with NGC 7538(E) are a point-like 1-25 micron infrared source, NGC 7538-IRS9, which probably provides the power for the far-infrared emission, and an extended source of 2.2 micron emission which appears to be an infrared reflection nebula. The compact H II regions, the maser sources and IRS9 are located within a dense molecular cloud at the edge of the optical H II region. This cloud, which has a mass of approximately 9000 solar masses, is detected in emission at 1 mm. The NGC 7538 region appears to contain examples of different stages in the formation of massive stars; it is suggested that the center of star formation is moving systematically to the southeast in this region.
Becklin Eric E.
Gatley Ian
Matthews Keith
Neugebauer Gernot
Werner Michael W.
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