Star formation in the NGC 7538 molecular cloud: near-infrared and radio spectroscopy

Journal Article · Sun Apr 15 04:00:00 EST 1984 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/161928· OSTI ID:6589837

Campbell, B; Thompson, R I

We present new CO millimeter-wave observations of the star-formation region NGC 7538 centered in the region around IRS 1--3, in which a large (rroughly-equal1.3 pc) and massive (75 M/sub sun/) high-velocity molecular outflow is identified. The correspondence of far-infrared emission with the extent of the molecular outflow leads to the proposal of an in situ mechanism for radiative acceleration of the gas, operable in cases where tau (dust) is insufficient to permit the ''snowplow'' outflow effect. We also synthesize new and previously published near infrared emission line observations of IRS 1--3, finding an apparent deficit in ionizing flux relative to the total far-infrared luminosity. We identify IRS 1 as the most luminous of the three sources, in which dust absorption within the ultracompact H II region has sharply reduced the ionizing flux. On this basis we argue that IRS 1 may also be the primary if not sole cuase of the molecular outflow.

• Research Organization: Department of Astronomy, University of Arizona
• OSTI ID: 6589837
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 279:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COSMIC RADIO SOURCES
DISTRIBUTION
DYNAMICS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
FUNCTIONS
H2 REGIONS
INFRARED RADIATION
INFRARED SPECTRA
INTERSTELLAR GRAINS
MAPS
MECHANICS
NEAR INFRARED RADIATION
NEBULAE
OXIDES
OXYGEN COMPOUNDS
PARTICLES
RADIATIONS
SPATIAL DISTRIBUTION
SPECTRA
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
SPECTROSCOPY
STAR ACCRETION
STAR EVOLUTION