Results 31 to 40 of about 154 (145)
Time Variations of Interstellar Water Masers in HII Regions [PDF]
Monthly Notices of the Royal Astronomical Society, 1979 Previous studies of time variations in water vapour sources associated with HII regions by Sullivan (1971, 1973) and Gammon (1976) have revealed variability on time-scales of 106-107s. Sullivan monitored nine sources over a period of 14 months and Gammon observed W49 (H2O) for 13 months.
White, G. J., Macdonald, G.H.
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NE2025: An Updated Electron Density Model for the Galactic Interstellar Medium
The Astrophysical JournalFree electrons in the Galactic interstellar medium (ISM) disperse and scatter coherent radio waves, by amounts that depend on the distance to the radio source.
Stella Koch Ocker, James M. Cordes
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Chemistry in Interstellar Hydroxyl Maser Regions [PDF]
Symposium - International Astronomical Union, 1987 The pumping of the upper levels of the 2π3/2 J=3/2 state of OH at sufficient rates to account for the observed strengths of interstellar hydroxyl masers requires that OH contains a substantial fraction of the oxygen. Shocks have been suggested as the sites of the OH production, but a better understanding of OH photodissociation and observations of ...
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The catalogues and mid-infrared environment of interstellar OH masers [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 23 pages (11 pages online only), 12 figures, Accepted.
Qiao, Haihua +4 more
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The Astrophysical JournalWe report multi-epoch Atacama Large Millimeter/submillimeter Array Band 5–7 observations of the high-mass episodic-accretion burst source G358.93−0.03, covering (sub-)millimeter CH _3 OH masers, quasi-thermal lines, and continuum from 2019 April to 2022 ...
Meizhu Liu +3 more
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Collisional Excitation and Weak Maser Action of Interstellar Methanimine [PDF]
The Journal of Physical Chemistry Letters, 2018 16 pages, 4 ...
Faure, Alexandre +2 more
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Masers and Star Formation Activities in W51A
The Astronomical JournalConcurrently with the maser flare observed in W51-North during the 3 month monitoring of H _2 O, NH _3 , and CH _3 OH maser variability from 2020 January to April using the Tianma 65 m Radio Telescope, we conducted Very Large Array mappings for these ...
Yan-Kun Zhang +5 more
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Enhanced density and magnetic fields in interstellar OH masers [PDF]
Astronomy & Astrophysics, 2006 19 pages including online material, accepted to A& ...
Fish, Vincent L. +3 more
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Radiative Transport in Interstellar Masers
The Astrophysical Journal, 1973 d bandwidth of emission from OH and H/sub 2/O maser spheres that are expanding or contracting and that are homogeneously or inhomogenously pumped. Amplification of resonant acatter is shown to be less important than that of spontaneous emission in detemnining the small apparent interferometer sizes of emitters.
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A 6 cm Formaldehyde Line Survey toward WISE Point Sources
The Astrophysical Journal Supplement SeriesWe conducted a 6 cm formaldehyde (H _2 CO) line survey across the northern sky, targeting 3149 high-mass star-forming region candidates selected from the all-sky Wide-field Infrared Survey Explorer (WISE) point-source catalog using the Shanghai TianMa 65
Jun-Ting Liu +8 more
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