Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..265d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 198, Jan. 1982, p. 265-272.
Astronomy and Astrophysics
Astronomy
26
Formaldehyde, Hydroxyl Emission, Interstellar Masers, Molecular Clouds, Nebulae, Radial Velocity, Astronomical Maps, Brightness Temperature, H Ii Regions, Spatial Resolution, Stellar Evolution, Very Large Array (Vla)
Scientific paper
The OH masers associated with IRS 1 in NGC 7538 observed with the Very Large Array at a spatial resolution of 1.2 arcsec and a velocity resolution of 0.65 km/s are discussed. At 1720 MHz, two components having radial velocities of -57.4 and -59.3 km/s are found to lie on the southern edge of the ultracompact H II region. They are separated by 0.24 + or - 0.07 arcsec in a direction that is roughly perpendicular to the line from the center of IRS 1. An upper limit of 0.3 arcsec is determined for the sizes. It is noted that these masers are not coincident with the two H2CO masers with similar velocities. Three spatial components are measured at 1665 MHz: one with V approximately equal to -59.0 km/s is on the northern edge of IRS 1 close to the H2CO masers; one with V approximately equal to -60.1 km/s is on the western edge; and the third with V approximately -57.9 km/s is midway between the center and the 1720-MHz OH masers to the south. The velocities and positions of the maser spots are interpreted in terms of a simple shell model.
Dickel Helene R.
Forster Robert J.
Goss William Miller
Rots Arnold H.
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