Results 51 to 60 of about 1,279 (175)
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.
openaire +2 more sources
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
doaj +1 more source
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
doaj +1 more source
Collisional Excitation and Weak Maser Action of Interstellar Methanimine [PDF]
The Journal of Physical Chemistry Letters, 2018 16 pages, 4 ...
Faure, Alexandre +2 more
openaire +5 more sources
Interstellar Hydroxyl Masers in the Galaxy. II. Zeeman Pairs and the Galactic Magnetic Field [PDF]
, 2003 We have identified and classified Zeeman pairs in the survey by Argon, Reid, & Menten of massive star-forming regions with 18 cm (2Π3/2,J = 3/2) OH maser emission.
V. Fish, M. Reid, A. Argon, K. Menten
semanticscholar +1 more source
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
doaj +1 more source
Interstellar Scattering and the Sizes of Astronomical Masers
The Astrophysical Journal, 1972 The suggestion is explored that scattering by inhomogeneities in the distribution of electrons causes astronomical masers to appear larger than their actual sizes. It is shown that neither scattering near the source nor scattering in the intervening medium is sufficiently strong to produce this effect.
Robert W. Boyd, Michael W. Werner
openaire +1 more source
CH3OH Thermal Lines Traces 6.7 GHz CH3OH Maser Variation of High-mass Protostar G353.273+0.641
The Astrophysical JournalThis study reports an analysis of the 6.7 GHz CH _3 OH maser in the high-mass protostar G353.273+0.641 (G353), utilizing data from the Tianma Radio Telescope.
Shi-Min Song +3 more
doaj +1 more source
Class II methanol masers in star formation regions
, 1996 In 1991 maser emission from the 51-60 A+ transition of CH3OH at a frequency of 6.7 GHz was discovered by Menten (1991a). This transition is more common and stronger than the 12.2-GHz (2 0-3_ 1E) transition discovered four years previously.
Ellingsen, Simon Peter (15931205)
core +1 more source
First Detection of Circular Polarization in 4.7 GHz Excited OH Masers
The Astrophysical JournalWe report the first detection of circular polarization in 4.7 GHz excited OH masers in star-forming regions made using full Stokes measurements with the Green Bank 100 m telescope.
Derck P. Smits, Paul Fallon
doaj +1 more source