Results 1 to 10 of about 4,740 (197)
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
An Updated Reference Frame for the Galactic Inner Parsec
The Astrophysical Journal, 2023 Infrared observations of stellar orbits about Sgr A* probe the mass distribution in the inner parsec of the Galaxy and provide definitive evidence for the existence of a massive black hole.
Jeremy Darling +5 more
doaj +1 more source
Laboratory astrophysics: Investigation of planetary and astrophysical maser emission [PDF]
Space Science Reviews, 2013 This paper describes a model for cyclotron maser emission applicable to planetary auroral radio emission, the stars UV Ceti and CU Virginus, blazar jets and astrophysical shocks. These emissions may be attributed to energetic electrons moving into convergent magnetic fields that are typically found in association with dipole like planetary ...
Bingham, R. +8 more
openaire +3 more sources
Polarized Maser Emission with In-source Faraday Rotation
The Astrophysical Journal, 2023 We discuss studies of polarization in astrophysical masers with particular emphasis on the case where the Zeeman splitting is small compared to the Doppler profile, resulting in a blend of the transitions between magnetic substates.
T. L. Tobin, M. D. Gray, A. J. Kemball
doaj +1 more source
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
doaj +1 more source
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
openaire +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
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
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
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
doaj +1 more source