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1162. OH/H2O masers database
- ID:
- ivo://CDS.VizieR/J/A+AS/137/43
- Title:
- OH/H2O masers database
- Short Name:
- J/A+AS/137/43
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Table 3 contains VLA spectra and positions for OH and H2O maser spots in 74 star-forming regions mapped by Forster and Caswell (1989A&A...213..339F). Galactic coordinates are given, followed by offset positions of the 22GHz continuum peak (HII) if detected, and the flux, velocity and positions of OH and H_2_O maser spots mapped in that field.
- ID:
- ivo://CDS.VizieR/J/A+A/327/755
- Title:
- OH maser emission from IRAS sources
- Short Name:
- J/A+A/327/755
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A high-sensitivity search for water maser emission at 22.2 GHz has been performed on a sample of 91 IRAS point sources at high-latitudes. The aim of the survey is to verify if these clouds are capable of star formation as indicated by the presence of water masers. The sample is based on the recent work of Magnani et al. (1995ApJS...96..159M) who have identified 192 infrared objects from the IRAS Faint Source Survey possibly associated with translucent clouds at galactic latitudes |b|>=30{deg}. These IRAS sources have far-infrared colours typical of young stellar objects and pre-main-sequence stars and thus provide a starting list for further studies about their actual nature. H_2_O maser emission is a good diagnostic of the presence of dense gas and of recent star formation. We did not find water maser emission at a level of 0.2-0.5Jy (3{sigma}) in any of the 91 objects. The negative result indicates that these high-latitude sources do not represent potential sites of star formation, consistent with the fact that most high-latitude molecular clouds do not appear gravitationally bound.
- ID:
- ivo://CDS.VizieR/J/A+A/414/235
- Title:
- OH maser emission from star forming regions
- Short Name:
- J/A+A/414/235
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- High sensitivity observations of all four transitions of the ground state at 18cm of OH in both senses of circular polarization have been carried out with the Nancay radio telescope. The sample was a set of 100 star forming regions detected in a recent unbiased survey of 6668MHz methanol masers (Szymczak et al., 2002A&A...392..277S). OH maser emission was found in 55 objects of which 31 were not previously catalogued.
- ID:
- ivo://CDS.VizieR/J/A+A/628/A90
- Title:
- OH maser emission in THOR survey
- Short Name:
- J/A+A/628/A90
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- OH masers trace diverse physical processes, from the expanding envelopes around evolved stars to star-forming regions or supernovae remnants. Providing a survey of the ground-state OH maser transitions in the northern hemisphere inner Milky Way facilitates the study of a broad range of scientific topics. We want to identify the ground-state OH masers at 18 cm wavelength in the area covered by "The HI/OH/Recombination line survey of the Milky Way (THOR)". We will present a catalogue of all OH maser features and their possible associated environments. The THOR survey covers longitude and latitude ranges of 14.3{deg}<l<66.8{deg} and b<+/-1.25{deg}. All OH ground state lines ^2^{PI}_3/2_(J=3/2) at 1612 (F=1-2), 1665 (F=1-1), 1667 (F=2-2) and 1720MHz (F=2-1) have been observed, employing the Very Large Array (VLA) in its C configuration. The spatial resolution of the data varies between 12.5" and 19", the spectral resolution is 1.5km/s, and the rms sensitivity of the data is 10mJy/beam per channel. We identify 1585 individual maser spots (corresponding to single spectral features) distributed over 807 maser sites (regions of size ~10^3^-10^4^AU). Based on different criteria from spectral profiles to literature comparison, we try to associate the maser sites with astrophysical source types. Approximately 51% of the sites exhibit the double-horned 1612MHz spectra typically emitted from the expanding shells of evolved stars. The separations of the two main velocity features of the expanding shells typically vary between 22 and 38km/s. In addition to this, at least 20% of the maser sites are associated with star-forming regions. While the largest fraction of 1720MHz maser spots (21 out of 53) is associated with supernova remnants, a significant fraction of the 1720MHz maser spots (17) are also associated with star-forming regions. We present comparisons to the thermal ^13^CO(1-0) emission as well as to other surveys of class II CH_3_OH and H_2_O maser emission. The catalogue attempts to present associations to astrophysical sources where available, and the full catalogue is available in electronic form. This OH maser catalogue presents a unique resource of stellar and interstellar masers in the northern hemisphere. It provides the basis for a diverse range of follow-up studies from envelopes around evolved stars to star-forming regions and Supernova remnants.
- ID:
- ivo://CDS.VizieR/J/A+A/297/494
- Title:
- OH maser from semiregular variables
- Short Name:
- J/A+A/297/494
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have made a high sensivity (~0.15Jy) search in the OH main-lines for maser emission from a sample of 181 semiregular variables.
- ID:
- ivo://CDS.VizieR/J/ApJS/155/595
- Title:
- OH maser IRAS and MSX observations
- Short Name:
- J/ApJS/155/595
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present OH maser observations at 1612, 1665, 1667, and 1720MHz for 86 likely post-asymptotic giant branch (post-AGB) stars selected from a survey of 1612MHz maser sources in the Galactic plane. The observations were taken with the Parkes Telescope and the Australia Telescope Compact Array between 2002 September and 2003 August. We redetected all 86 sources at 1612MHz, while 27 sources were detected at 1665MHz and 45 at 1667MHz. One source was redetected at 1720MHz. We present a classification scheme for the maser profiles and show that 25% of sources in our sample are likely to have asymmetric or bipolar outflows.
1168. OH masers in W3(OH)
- ID:
- ivo://CDS.VizieR/J/ApJ/668/331
- Title:
- OH masers in W3(OH)
- Short Name:
- J/ApJ/668/331
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Recent studies of methanol and ground-state OH masers at very high spectral resolution have shed new light on small-scale maser processes. The nearby source W3(OH), which contains numerous bright masers in several different transitions, provides an excellent laboratory for high spectral resolution techniques. We present a model of W3(OH) based on European VLBI Network (EVN) observations of the rotationally excited 6030 and 6035MHz OH masers taken at 0.024km/s spectral resolution.
- ID:
- ivo://CDS.VizieR/J/A+A/465/865
- Title:
- OH masers towards high mass protostellar object
- Short Name:
- J/A+A/465/865
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Masers are important tracers of the early evolution of young high mass stars, but the relationship between different types of maser and the evolutionary state of the exciting source remains unclear. ************************************************************************** * * * Sorry, but the author(s) never supplied the tabular material * * announced in the paper * * * **************************************************************************
- ID:
- ivo://CDS.VizieR/J/A+A/277/453
- Title:
- OH maser survey of cool IRAS sources
- Short Name:
- J/A+A/277/453
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The data are the results of a search for 1612MHz OH circumstellar masers in a colour limited sample of cool ORAS sources. Most of the observations were made at the Nancay radio telescope between January 1986 and February 1988; some were observed or reobserved later, between 1990 and 1992.
