New H sub 2 O masers in the NGC 7538 region

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168788· OSTI ID:6696828

Kameya, Osamu; Morita, Kohichiro; Kawabe, Ryohei; Ishiguro, Masato ^[1]

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1. Nobeyama Radio Observatory, Minamimaki (Japan)

H2O maser emission in the NGC 7538 molecular cloud has been mapped with the Nobeyama Millimeter Array with absolute and relative positional accuracies of 0.5 arcsec and 0.2 arcsec, respectively. Five new masers have been found within an 8 arcmin x 8 arcmin area. One is associated with IRS 9, and the other four are not associated with any known infrared or optical sources. The brightest H{sub 2}O maser spot is 3 arcmin southwest from IRS 11 with a flux density of 156 Jy. These masers may be related to premain-sequence objects and/or protostars in the NGC 7538 molecular cloud. Two previously known H{sub 2}O masers associated with IRS 1-3 and IRS 11 are resolved into 11 and 12 maser spots, respectively. The H{sub 2}O maser spots associated with IRS 1-3 seem to be separated into two groups: one of which is very close to the ultracompact H II region at IRS 1, and the other far from IRS 1. 36 refs.

• OSTI ID: 6696828
• Journal Information: Astrophysical Journal; (USA), Vol. 355; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
INTERSTELLAR SPACE
MASERS
COORDINATES
COSMIC GASES
EMISSION SPECTRA
H2 REGIONS
INFRARED RADIATION
MAIN SEQUENCE STARS
MOLECULES
PROTOSTARS
STAR EVOLUTION
WATER
AMPLIFIERS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUIDS
GASES
HYDROGEN COMPOUNDS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
OXYGEN COMPOUNDS
RADIATIONS
SPACE
SPECTRA
STARS
640105* - Astrophysics & Cosmology- Galaxies