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CAS98 - Positions of hydroxyl masers at 1665 and 1667 MHz

Short title: Caswell (1998)
Authors: Caswell, J. L.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 1, pp. 215-235.
Bibcode:

Target type: OH
Transitions: OH_1665,OH_1667,OH_6035

Abstract
The Australia Telescope Compact Array has been used to observe more than 200 1665-MHz hydroxyl masers south of declination -16 deg and derive their positions with typical rms uncertainties of 0.4 arcsec. Many of the 1665-MHz maser sites are found to have 1667-MHz OH maser counterparts which are coincident, within the errors. The resulting position list presented here includes all well-documented, previously reported 1665-MHz masers close to the Galactic plane in the galactic longitude range 230 deg (through 360 deg) to 13 deg. Nearly 50 newly discovered masers are also listed, chiefly in the longitude range 312 deg to 356 deg, where the observations were conducted as an intensive survey of a continuous zone close to the Galactic plane. Many of the maser sites are discussed briefly so as to draw attention to those possessing properties that are unusual among this large sample. Most of the masers are of the variety found in star-forming regions - at the sites of newly formed massive stars and their associated ultracompact H ii regions. The new, accurate, positions reveal coincidences of the OH masers with the continuum radio emission, with the infrared emission from dust that accompanies such regions, and with emission from other maser species such as methanol at 6668 MHz and water at 22 GHz. By-products of the survey, also presented here, include measurements of at least 11 objects that are not associated with massive star-forming regions. They comprise several OH/IR stars (detected at the 1667- or 1665-MHz transition of OH, though commonly found to be most prominent at the 1612-MHz transition) and several unusual masers that may pinpoint other varieties of late-type stars or protoplanetary nebulae.	Comments: Spectral type was set to: ""S"", where only one peak was found. ""D"", where two peaks were found. Velocity resolution: 0.70 km/s Upper limit for non-detections: <0.5 Jy Included are the 11 masers not associated with star-forming regions Two of them were not observed at 1667 MH

Abstract

The Australia Telescope Compact Array has been used to observe more than 200 1665-MHz hydroxyl masers south of declination -16 deg and derive their positions with typical rms uncertainties of 0.4 arcsec. Many of the 1665-MHz maser sites are found to have 1667-MHz OH maser counterparts which are coincident, within the errors. The resulting position list presented here includes all well-documented, previously reported 1665-MHz masers close to the Galactic plane in the galactic longitude range 230 deg (through 360 deg) to 13 deg. Nearly 50 newly discovered masers are also listed, chiefly in the longitude range 312 deg to 356 deg, where the observations were conducted as an intensive survey of a continuous zone close to the Galactic plane. Many of the maser sites are discussed briefly so as to draw attention to those possessing properties that are unusual among this large sample. Most of the masers are of the variety found in star-forming regions - at the sites of newly formed massive stars and their associated ultracompact H ii regions. The new, accurate, positions reveal coincidences of the OH masers with the continuum radio emission, with the infrared emission from dust that accompanies such regions, and with emission from other maser species such as methanol at 6668 MHz and water at 22 GHz. By-products of the survey, also presented here, include measurements of at least 11 objects that are not associated with massive star-forming regions. They comprise several OH/IR stars (detected at the 1667- or 1665-MHz transition of OH, though commonly found to be most prominent at the 1612-MHz transition) and several unusual masers that may pinpoint other varieties of late-type stars or protoplanetary nebulae.

Comments:
Spectral type was set to:
""S"", where only one peak was found.
""D"", where two peaks were found.

Velocity resolution: 0.70 km/s
Upper limit for non-detections: <0.5 Jy
Included are the 11 masers not associated with star-forming regions
Two of them were not observed at 1667 MH

Input tables: Table 1
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Detection table from Caswell (1998)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Frequency	V_range	V_peak	F_peak	Telescope	RMS	Beam	Detection	Type	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)			(MHz)	(km/s)	(km/s)	(Jy)		(Jy)	(arcsec)	Yes/No		(kpc)

Non-detection table from Caswell (1998)