Results 31 to 40 of about 440 (199)

Cyclotron Maser Radiation from Astrophysical Shocks

The Astrophysical Journal, 2003
One of the most popular coherent radio emission mechanisms is electron cyclotron maser instability. In this article we demonstrate that electron cyclotron maser emission is directly associated with particular types of charged particle acceleration such as turbulence and shocks commonly inferred in astrophysical plasmas.
Bingham, R., Kellett, B.J., Cairns, R.A., Tonge, J., Mendonça, J.T.   +4 more
openaire   +3 more sources

Masers and Other Instabilities in a Weakly Magnetized Relativistic Plasma: Theory and the Astrophysical Relevance of the Maser [PDF]

The Astrophysical Journal, 2019
Abstract A sufficient condition for maser instability in a weakly magnetized relativistic plasma with an isotropic particle distribution function is given. Maser growth rates and polarizations are computed starting from the exact dielectric permittivity tensor of a magnetized plasma.
Andrei Gruzinov, Eli Waxman
openaire   +2 more sources

Formaldehyde Masers: Exclusive Tracers of High-mass Star Formation [PDF]

, 2015
The detection of four formaldehyde (H2CO) maser regions toward young high-mass stellar objects in the last decade, in addition to the three previously known regions, calls for an investigation of whether H2CO masers are an exclusive tracer of young high ...
Hofner, P., Kurtz, S., Brown, J. E., Araya, E. D., Creech-Eakman, M. J., Linz, H., OLMI, LUCA, Morales Ortiz, J.   +7 more
core   +1 more source

Effects of Fully Relativistic Condition on Electron Cyclotron Maser Emission

The Astrophysical Journal, 2023
The electron cyclotron maser (ECM) instability is a very important nonthermal radiation mechanism. It has been developed by proposing various electron distribution functions as well as the relativistic resonance condition, called the semirelativistic ...
Lijie Zhang, Jianfei Tang, Jinhua Shen, Dejin Wu, Ling Chen   +4 more
doaj   +1 more source

GLOBAL VERY LONG BASELINE INTERFEROMETRY OBSERVATIONS OF THE 6.0 GHz HYDROXYL MASERS IN ONSALA 1 [PDF]

, 2010
We present global very long baseline interferometry observations of the first excited-state hydroxyl (OH) masers in the massive star-forming region Onsala 1 (ON 1).
Sjouwerman, Loránt O., Fish, Vincent L.
core   +1 more source

Class I methanol masers: masers with extended green objects

, 2009
We have compared the results of a number of published class I methanol maser surveys with the catalogue of high-mass outflow candidates identified from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire survey (known as extended green objects ...
Chen, X (6446246), Simon Ellingsen (14735971), Shen, ZQ (15482123)   +2 more
core   +2 more sources

ALMA Detection of Masers and Dasars in the Hydrogen Recombination Lines of the Planetary Nebula Mz3

The Astrophysical Journal
The hydrogen recombination lines H30 α , H40 α , H42 α , H50 β , and H57 γ and the underlying bremsstrahlung continuum emission were detected with ALMA in the bipolar nebula Mz3.
Zulema Abraham, Pedro P. B. Beaklini, Isabel Aleman, Raghvendra Sahai, Albert Zijlstra, Stavros Akras, Denise R. Gonçalves, Toshiya Ueta   +7 more
doaj   +1 more source

Frequency Standard Contributions to Limitations on the Signal‐to‐Noise Ratio in Very Long Baseline Interferometric Observations

Radio Science, Volume 61, Issue 6, June 2026.
Abstract Since its observation in 2019, the first image of a super‐massive black hole using Very Long Baseline Interferometry (VLBI) with an Earth‐scale baseline has generated much scientific and public interest. Work is now underway to extend the baseline into space to obtain higher image resolution.
E. A. Burt, T. A. Ely, G. C. Bower, T. J. W. Lazio, M. Anderson, S. Hernandez   +5 more
wiley   +1 more source

ATCA OBSERVATIONS OF SiO MASERS IN THE GALACTIC CENTER

, 2010
We present the Australia Telescope Compact Array observations of the SiO masers in the Galactic center (GC) in transitions of v = 1, J = 2-1 at 86 GHz and v = 1, J = 1-0 at 43 GHz.
Zhi-Qiang Shen, An, Tao, Atsushi Miyazaki, Shen, Zhi-Qiang, Juan Li, Li, Juan, Tao An, Miyazaki, Atsushi   +7 more
core   +1 more source

Methanol masers and magnetic field in IRAS18089-1732 [PDF]

, 2018
Theoretical simulations have shown that magnetic fields play an important role in massive star formation: they can suppress fragmentation in the star forming cloud, enhance accretion via disc and regulate outflows and jets.
Surcis, G., Persson, M. V., Vlemmings, W., Dall'Olio, Daria, Richards, A. M. S., Richards, A., Beuther, H., Dall'Olio, D., Vlemmings, W. H. T., Lankhaar, B., Persson, M., Surcis, Gabriele, Varenius, E.   +12 more
core   +1 more source