Collisional pumping of H2O masers in star-forming regions

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/170071· OSTI ID:5504074

Kylafis, N D; Norman, C A ^[1]

---

1. Crete, University, Heraklion (USA) Johns Hopkins University, Baltimore, MD (USA)

The pumping of H2O masers in star-forming regions by collisions with H2 molecules has been studied. It is found that the strong water masers in star-forming regions may not be explained by collisional pumping, unless very large aspect ratios (length/diameter) for the cylinder or small velocity gradients along the axis of the cylinder are assumed. In addition to the 22 GHz water maser, results are presented for other maser transitions of water in the submillimeter range. The detection of these masers with submillimeter telescopes could significantly enhance the understanding of the physical conditions in star-forming regions. 34 refs.

• OSTI ID: 5504074
• Journal Information: Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 373; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFIERS
ASPECT RATIO
BOSONS
CYLINDERS
DETECTION
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
ELEMENTARY PARTICLES
ELEMENTS
EQUIPMENT
HYDROGEN
HYDROGEN COMPOUNDS
INFRARED RADIATION
INTERSTELLAR SPACE
MASERS
MASSLESS PARTICLES
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
MOLECULES
NONMETALS
OXYGEN COMPOUNDS
PHOTONS
PUMPING
RADIATION TRANSPORT
RADIATIONS
SPACE
WATER