Results 21 to 30 of about 440 (199)
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
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
doaj +1 more source
Physical properties of Class I methanol masers [PDF]
, 2018 As first realised in the late 1980s, methanol masers come in two varieties, termed Class I and Class II. While Class II masers had observationally been extensively studied in the past, until recently relatively little attention was paid to Class I ...
Leurini, S. +3 more
core +1 more source
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
doaj +1 more source
VLBI observations of H2O and CH3OH masers in two high-mass YSOs [PDF]
, 2007 We have conducted phase-reference VLBI observations of H2O and CH3OH masers toward two high-mass star forming regions, Sh 2-255 IR and AFGL 5142. In Sh 2-255 infrared water masers are aligned along a direction close to the orientation of a large scale H2
MOSCADELLI, Luca +4 more
core +1 more source
Saturation and beaming in astrophysical masers
The Astrophysical Journal, 1985 A 'four-stream' model system of equations that are closely analogous to the equations of radiative transfer in a maser spectral line and are amenable to numerical solution are constructed. This model is used to investigate radiative transfer in asymmetric maser clouds.
C. Alcock, R. R. Ross
openaire +1 more source
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
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
VLA Observations of a Sample of Low-Brightness 6.7 GHz Methanol Masers [PDF]
, 2018 In 2014 we conducted a survey for 6.7 GHz methanol masers with the Arecibo Tele- scope toward far infrared sources selected from the Hi-GAL catalog of massive cores.
Armstrong, Jason +2 more
core +1 more source
Detection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser Emission
The Astrophysical Journal Letters, 2023 MWC 349A is one of the rare stars known to have hydrogen radio recombination line (RRL) masers. The bright maser emission makes it possible to study the dynamics of the system at milliarcsecond (mas) precision.
Sirina Prasad +7 more
doaj +1 more source