Results 71 to 80 of about 440 (199)

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

EXPANDED VERY LARGE ARRAY DETECTION OF 36.2 GHz CLASS I METHANOL MASERS IN SAGITTARIUS A [PDF]

, 2009
We report on the interferometric detection of 36.2 GHz Class I methanol emission with the new 27-40 GHz Ka-band receivers available on the Expanded Very Large Array (EVLA).
Pihlström, Ylva M., Sjouwerman, Loránt O., Fish, Vincent L.   +2 more
core   +1 more source

Large-scale Effect of an Accretion Burst in the High-Mass Young Stellar Object G358.93-0.03-MM1

The Astronomical Journal
The high-mass young stellar object G358.93-0.03-MM1 underwent a rapid accretion burst event from 2019 January to June, resulting in flares observed in most class II methanol maser transitions starting in mid-January.
Dan Miao, Xi Chen, Olga S. Bayandina, Andrej M. Sobolev, Wan-jun Li, Koichiro Sugiyama   +5 more
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

Infrared variability, maser activity, and accretion of massive young stellar objects [PDF]

, 2017
Methanol and water masers indicate young stellar objects. They often exhibit flares, and a fraction shows periodic activity. Several mechanisms might explain this behavior but the lack of concurrent infrared (IR) data complicates the identification of ...
CARATTI O GARATTI, ALESSIO, Linz, Hendrik, MOSCADELLI, Luca, SANNA, ALBERTO, Linz, H., Garatti, A., Caratti o Garatti, A., Stecklum, Bringfried, Hodapp, K., Hodapp, Klaus, Sanna, A., Stecklum, B., Moscadelli, L.   +12 more
core   +1 more source

Investigating the Hot Zone Developed Under Short‐Circuiting Conditions and the Coupled Magnetosphere‐Ionosphere (M‐I) System for the Subauroral Arc's Inner‐Magnetosphere Generation Environment

Journal of Geophysical Research: Space Physics, Volume 129, Issue 6, June 2024.
Abstract Based on correlated magnetosphere‐ionosphere (M‐I) conjugate observations of seven events, we study the hot zone developed under short‐circuiting conditions leading (a) to the development of outward Subauroral Polarization Streams (SAPS) or Subauroral Ion Drifts (SAID) electric (E) field and (b) to the various subauroral arcs' absence or ...
Ildiko Horvath, Brian C. Lovell
wiley   +1 more source

Accelerations of Water Masers in NGC 4258

, 2017
The water masers in NGC4258 delineate the structure and dynamics of a sub-parsec-diameter accretion disk around a supermassive black hole. VLBA observations provide precise information about the positions in the plane of the sky and the three-dimensional
Greenhill, Lincoln, Moran, James, Bragg, Ann E., Henkel, Christian   +3 more
core   +1 more source

Unveiling Ionized Jet Morphologies: Subarcsecond VLA Observations of Compact Radio Sources

The Astronomical Journal
We present subarcsecond ( θ ∼ 0 $\mathop{.}\limits^{\unicode{x02033}}$ 1) resolution VLA 1.3 cm continuum and 22.2 GHz H _2 O maser observations toward 15 compact radio continuum sources with rising spectral index and eight string-like radio continuum ...
Tatiana M. Rodríguez, Peter Hofner, Emmanuel Momjian, Esteban D. Araya, Ananay Sethi, Viviana Rosero   +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

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