Results 61 to 70 of about 173 (158)

Instabilities and the transport of polarized astrophysical maser radiation

The Astrophysical Journal, 1995
Time-dependent, radiative instabilities in the creation and transport of polarized astrophysical maser radiation in the presence of a magnetic field are calculated. The instabilities are similar to and occur under the same conditions as those found previously by Scappaticci & Watson for unpolarized maser radiation. The common limits in which the Zeeman
Bradley K. Wallin, William D. Watson
openaire   +1 more source

Spectral Structures of Jovian Broadband Kilometric Radiation Revealed by Cassini and Juno

Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.
Abstract Cassini flew past Jupiter in 2000/2001, and Juno has been orbiting the gas giant since mid‐2016. Here we focus on the spectral properties of Jovian broadband kilometric radiation (bKOM), and we classified them according to their slope in the time–frequency spectrum and distinguish four categories with negative, positive, mixed, or no slope in ...
G. Fischer, U. Taubenschuss, D. Píša, M. Imai, W. S. Kurth   +4 more
wiley   +1 more source

Testing OH Megamaser Identification Methods in H i Surveys: Updated Source-flagging Algorithms and New Detections in ALFALFA

The Astrophysical Journal
OH megamasers (OHMs) are extragalactic masers found primarily in gas-rich galaxy major mergers. To date, only ∼120 OHMs have been cataloged since their discovery in 1982, and efforts to identify distinct characteristics of OHM host galaxies have remained
Hayley Roberts, Jeremy Darling, Kelley M. Hess, Andrew J. Baker, Elizabeth A. K. Adams, Helga Dénes   +5 more
doaj   +1 more source

Lorentz violation bounds from torsion trace fermion sector and galaxy M 51 data and chiral dynamos

European Physical Journal C: Particles and Fields, 2017
Earlier we have computed a Lorentz violation (LV) bound for torsion terms via galactic dynamos and found bounds similar to the one obtained by Kostelecky et al. (Phys Rev Lett 100:111102, 2008) which is of the order of $$10^{-31}$$ 10 - 31 GeV.
L. C. Garcia de Andrade
doaj   +1 more source

Ray Tracing for Jupiter's Icy Moon Ionospheric Occultation of Jovian Auroral Radio Sources

Journal of Geophysical Research: Space Physics, Volume 129, Issue 6, June 2024.
Abstract The ionospheres of Jupiter's icy moons have been observed by in situ plasma measurements and radio science. However, their spatial structures have not yet been fully characterized. To address this, we developed a new ray tracing method for modeling the radio occultation of the ionospheres using Jovian auroral radio sources. Applying our method
Rikuto Yasuda, Tomoki Kimura, Hiroaki Misawa, Fuminori Tsuchiya, Baptiste Cecconi, Yasumasa Kasaba, Shinnosuke Satoh, Shotaro Sakai, Corentin K. Louis   +8 more
wiley   +1 more source

OH Maser Polarimetric Observations of Planetary Nebulae

The Astrophysical Journal
We present full-polarization observations of the four ground-state transitions of OH, carried out with the Australia Telescope Compact Array toward two very young planetary nebulae (PNe), IRAS 16333−4807 and IRAS 17393−2727. We detect Zeeman splitting in
L. Uscanga, M. D. Gray, J. F. Gómez, J. A. Green, K. Asanok, L. F. Miranda, M. A. Trinidad, G. Anglada, P. Boumis   +8 more
doaj   +1 more source

Surveys of the Milky Way and Magellanic System in the λ21-cm line of atomic hydrogen

EPJ Web of Conferences, 2012
In the next three years, surveys of the Northern and Southern skies using focal plane arrays on aperture synthesis radio telescopes will lead to a breakthrough in our knowledge of the warm and cool atomic phases of the interstellar medium and their ...
Dickey J.M.
doaj   +1 more source

Magnetic reconnection as the driving factor behind high-mass protostellar luminosity flares

Communications Physics
Magnetic reconnection, a critical process in astrophysical luminosity outbursts like solar flares, may also underpin such events in high-mass young stellar objects (HMYSOs).
Xi Chen, Jun-Ting Liu, Olga S. Bayandina, Shi-Min Song, Sergey Khaibrakhmanov, Andrej M. Sobolev, Sheng-Yuan Liu, Zhi-Wei Chen, Da-Lei Li, Bin Li, Bo Xia, Zhi-Qiang Shen, Tie Liu, Pak-Shing Li, Xiao-Juan Zhang   +14 more
doaj   +1 more source

Detections of Compact Radio Continuum toward Methanol Maser Rings Using the VLA

The Astrophysical Journal
High-mass protostars are deeply embedded in dust inside their natal cores and are not easily detectable. However, maser emission at centimeter wavelengths, owing to its high brightness, enables us to study gas kinematics in protostars’ circumstellar ...
Anna Bartkiewicz, Olga Bayandina, Alberto Sanna, Marian Szymczak, Luca Moscadelli, Agnieszka Kobak, Huib Jan van Langevelde, Ashwin Varma   +7 more
doaj   +1 more source

Polarization Observations of a Sample of 6.7 GHz Methanol Masers

The Astrophysical Journal
Spectra of 6.7 GHz methanol masers from 21 pointings of known star-forming regions are reported. C -band observations, using the Green Bank Telescope in full Stokes mode, have measured how polarization properties vary across the maser profiles in each ...
Paul Fallon, Derck P. Smits
doaj   +1 more source