Results 11 to 20 of about 176 (166)
Luminosity Outburst of a High-mass Young Stellar Object Triggered by the Surrounding Radiation Field
The Astrophysical Journal Letters, 2023 We present observations of the 6.7 GHz methanol and 4.8 GHz formaldehyde masers toward the high-mass young stellar object G24.33+0.14 (hereafter G24). Our observations were conducted from 2019 to 2021 using the Shanghai Tianma 65 m Radio Telescope and ...
Jun-Ting Liu +10 more
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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
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The 107 GHz Methanol Transition Is a Dasar in G0.253+0.016
The Astrophysical Journal, 2023 We present observations of population anti-inversion in the 3 _1 − 4 _0 A ^+ transition of CH _3 OH (methanol) at 107.013831 GHz toward the Galactic center cloud G0.253+0.016 (“The Brick”).
Alyssa Bulatek +4 more
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Circular Polarization of Astrophysical Masers [PDF]
Symposium - International Astronomical Union, 1988 Results of further calculations are presented to explore the non-linear, Zeeman overlap effect as the cause for the circular polarization of astrophysical masers. Emphasis is placed on the regime in which the Zeeman splitting is small and on the variation of the polarization with maser saturation.
S. Deguchi, G. Nedoluha, W. D. Watson
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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
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Broadband VLA Spectral-line Survey of a Sample of Ionized Jet Candidates
The Astrophysical Journal Supplement Series, 2023 The study of the interaction between ionized jets, molecular outflows, and their environments is critical to understanding high-mass star formation, especially because jets and outflows are thought to be key in the transfer of angular momentum outward ...
E. Sanchez-Tovar +4 more
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Luminosity Outburst Energized by the Collision between the Infalling Streamer and Disk in W51 North
The Astronomical Journal, 2023 We report the detection of the disk/torus, outflow, and inflow structures traced by H _2 O masers toward a high-mass young stellar object W51 North during its H _2 O maser outburst stage using the Karl G. Jansky Very Large Array (VLA).
Yan-Kun Zhang +3 more
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The Astrophysical Journal, 2023 We present the first results from the Southern Hemisphere Parallax Interferometric Radio Astrometry Legacy Survey: 10 μ as accurate parallaxes and proper motions for two Southern Hemisphere 6.7 GHz methanol masers obtained using the inverse MultiView ...
L. J. Hyland +13 more
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The Astrophysical Journal, 2023 We present High Sensitivity Array observations of the H _2 O megamasers of NGC 1068. We obtain absolute astrometry with 0.3 mas precision that confirms the association of the disk masers with the nuclear radio continuum source S1.
Jack F. Gallimore +1 more
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Maser radiation from collisionless shocks: application to astrophysical jets [PDF]
High Power Laser Science and Engineering, 2019 This paper describes a model of electron energization and cyclotron-maser emission applicable to astrophysical magnetized collisionless shocks. It is motivated by the work of Begelman, Ergun and Rees [Astrophys. J. 625, 51 (2005)] who argued that the cyclotron-maser instability occurs in localized magnetized collisionless shocks such as those expected ...
Speirs, D. C. +29 more
openaire +5 more sources