Positions of hydroxyl masers at 1665 and 1667 MHz

Details Positions of hydroxyl masers at 1665 and 1667 MHz Positions of hydroxyl masers at 1665 and 1667 MHz

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.297..215c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 1, pp. 215-235.

Astronomy and Astrophysics

Astronomy

100

Masers, Stars: Formation, H Ii Regions, Ism: Molecules, Radio Lines: Ism

Scientific paper

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.

Affiliated with

Also associated with

No associations

Rating

Positions of hydroxyl masers at 1665 and 1667 MHz does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Positions of hydroxyl masers at 1665 and 1667 MHz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Positions of hydroxyl masers at 1665 and 1667 MHz will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1505735