Results 1 to 10 of about 140 (98)
The Parallax and 3D Kinematics of Water Masers in the Massive Star-forming Region G034.43+0.24
The Astrophysical Journal, 2023 We report a measurement of the trigonometric parallax of 22 GHz water masers in the massive star-forming region G034.43+0.24 as part of the Bar and Spiral Structure Legacy Survey using the Very Long Baseline Array.
Xiaofeng Mai +14 more
doaj +1 more source
The Astrophysical Journal, 2023 Because of detailed monitoring of the 22.2 GHz water maser, carried out from 2021 October to 2023 May, a very powerful flare phenomenon was detected in the galactic object W51 near the radial velocity of 60 km s ^−1 with the amplitude of 140 kJy.
A. E. Volvach +2 more
doaj +1 more source
The Astrophysical Journal Supplement Series, 2023 We have conducted a systematic line survey, primarily focused on transitions of the methanol and ammonia molecules, and monitoring observations of masers toward the high-mass star-forming region NGC 6334I.
Jiong-Heng Wu +12 more
doaj +1 more source
Simultaneous Time-monitoring Observations of H2O and SiO Masers toward the Supergiant VX Sagittarii
The Astrophysical Journal Supplement Series, 2023 We performed simultaneous monitoring observations of the 22.2 GHz H _2 O and 43.1/42.8/86.2/129.3 GHz SiO masers toward the red supergiant VX Sagittarii using the Korean VLBI Network single-dish telescopes.
Dong-Hwan Yoon +4 more
doaj +1 more source
183 GHz Water Megamasers in Active Galactic Nuclei: A New Accretion Disk Tracer
The Astrophysical Journal, 2023 We present the results of an Atacama Large Millimeter/submillimeter Array survey to identify 183 GHz H _2 O maser emission from active galactic nuclei (AGNs) already known to host 22 GHz megamaser systems.
Dominic W. Pesce +5 more
doaj +1 more source
Proper Motions of Water Masers in W49 N Measured by KaVA
The Astrophysical Journal, 2023 We report the proper motions of 22 GHz water masers toward W49 N that were observed by the KVN and VERA Array (KaVA) during 2017 February–May. We found 263, 268, and 310 features in three successive epochs; they were distributed in a region of size 4 × 4
Kitiyanee Asanok +8 more
doaj +1 more source
Evolution of the Outflow in the Water Fountain Source IRAS 18043–2116
The Astrophysical Journal, 2023 We present the spectral and spatial evolution of H _2 O masers associated with the water fountain source IRAS 18043−2116, found in observations with the Nobeyama 45 m Telescope and the Australia Telescope Compact Array. We have found new highest-velocity
L. Uscanga +7 more
doaj +1 more source
5 cm OH Masers in Northern Star Formation Regions
The Astronomical JournalWe present a 6.0 GHz excited-state OH maser survey toward 155 northern star formation regions utilizing the Shanghai Tianma Radio Telescope. In total, we detect 44 6.0 GHz OH masers, 8 of which are new detections (one at 6016 MHz, two at 6030 MHz, and ...
Hai-Hua Qiao +6 more
doaj +1 more source
Excited-state OH Masers in the Water Fountain Source IRAS 18460-0151
The Astrophysical Journal LettersWater fountain objects are generally defined as evolved stars with low to intermediate initial mass accompanied by high-velocity molecular jets detectable in the 22.235 GHz H _2 O maser line.
Xu-Jia Ouyang +5 more
doaj +1 more source
Water Maser Detections toward 70 μm Infrared Dark Clumps at Early Star Formation Stage
The Astrophysical Journal LettersWater masers provided powerful probes of shocked gas and protostellar activity during the early stages of star formation. Using Very Large Array K -band observations of the 22 GHz water line, we report the first detections of water masers toward dense ...
Chao Ou +4 more
doaj +1 more source