New H/sub 2/O masers associated with far-infrared sources
We have searched for H/sub 2/O masers in the direction of far-infrared sources found in a recent survey. There are 25 H/sub 2/O masers near the 42 far-IR sources, of which 13 masers are new detections. Many of the far-IR sources are in the general vicinity of compact H II regions, and are thus likely to be young objects. Our results are consistent with a 50--100% coincidence of H/sub 2/O masers with far-IR sources, suggesting that such objects are even more suitable candidates for maser searches than the compact H II regions. The high coincidence rate implies a lifetime of more than 2 x 10/sup 5/ years for the maser phase. The large velocity differences between the H/sub 2/O features and the molecular clouds in the directions of these sources are similar to those observed in the more well-known H/sub 2/O sources studied by VLBI. As in those sources, the velocities imply mass loss. Hence the far-IR sources are probably not ''protostars'' in a phase of pure contraction.
- OSTI ID:
- 5729092
- Journal Information:
- Astrophys. J.; (United States), Vol. 250:2
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
NEBULAE
MASERS
FAR INFRARED RADIATION
H2 REGIONS
INFRARED SPECTRA
WATER
AMPLIFIERS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
HYDROGEN COMPOUNDS
INFRARED RADIATION
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
OXYGEN COMPOUNDS
RADIATIONS
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies