Results 51 to 60 of about 440 (199)

Excited-state OH Masers in the Water Fountain Source IRAS 18460-0151

The Astrophysical Journal Letters
Water fountain objects are generally defined as evolved stars with low to intermediate initial mass accompanied by high-velocity molecular jets detectable in the 22.235 GHz H _2 O maser line.
Xu-Jia Ouyang, Yong Zhang, Juan Li, Jun-ichi Nakashima, Xi Chen, Hai-Hua Qiao   +5 more
doaj   +1 more source

Quasilinear Wave‐Particle Analysis in the Source Region of Jovian Kilometric Radio Emission

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract Jovian broadband kilometric emission (bKOM) is observed by the Juno spacecraft within a source region in the northern hemisphere near the equatorward edge of the auroral oval. A well‐developed upward loss cone is the free‐energy source of the bKOM.
P. H. Yoon, J. D. Menietti, F. Allegrini, W. S. Kurth, J. B. Faden, G. B. Hospodarsky, J. E. P. Connerney, S. J. Bolton   +7 more
wiley   +1 more source

Masers and Star Formation Activities in W51A

The Astronomical Journal
Concurrently with the maser flare observed in W51-North during the 3 month monitoring of H _2 O, NH _3 , and CH _3 OH maser variability from 2020 January to April using the Tianma 65 m Radio Telescope, we conducted Very Large Array mappings for these ...
Yan-Kun Zhang, Xi Chen, You-Xin Wang, Shi-Min Song, Jun-Ting Liu, Ying Lu   +5 more
doaj   +1 more source

AKR Observations From All Local Times Indicate Substorm Activity

Journal of Geophysical Research: Space Physics, Volume 130, Issue 9, September 2025.
Abstract Auroral Kilometric Radiation (AKR) is known to present emission at lower frequencies near substorm onset, corresponding to activation of higher altitude sources along auroral magnetic field lines and acting as a proxy of the vertical distribution of acceleration processes during these events.
J. E. Waters, L. Lamy, J. Coxon, C. M. Jackman, C. J. Lao, C. Forsyth, A. R. Fogg   +6 more
wiley   +1 more source

A survey for OH masers in H2O maser galaxies with the Effelsberg and Green Bank radio telescopes [PDF]

, 2018
We present a search for OH maser emission in galaxies hosting H2O masers with the 100-m Effelsberg radio telescope and the Green Bank Telescope (GBT). This survey is aimed at investigating the apparent rarity and/or possible mutual exclusion of megamaser
Castangia, P., Surcis, G., Henkel, C., TARCHI, ANDREA, CASTANGIA, PAOLA, Tarchi, A., LADU, ELISABETTA, Surcis, Gabriele, Henkel, Christian, Ladu, E.   +9 more
core   +1 more source

Methanol masers in NGC 253 with ALCHEMI [PDF]

, 2022
Context. Methanol masers of Class I (collisionally pumped) and Class II (radiatively pumped) have been studied in great detail in our Galaxy in a variety of astrophysical environments such as shocks and star-forming regions and are they are helpful to ...
K. Sakamoto, Henkel, C., Aladro, R., D. S. Meier, Tanaka, K, Tanaka, K., Henkel, Christian, S. Muller, Aalto, Susanne,, Mauersberger, R.,, Aalto, S, Humire, Pedro,, Muller, S., Harada, Nanase, Mühle, S, Mauersberger, R, Mauersberger, R., Martin, S.,, Rivilla, VM, Emig, KL, Meier, D.S., Huang, K., Aalto, S., Viti, Serena, Mangum, Jeffrey G., Menten, K.M., Tanaka, Kunihiko,, Sakamoto, K.,, van der Werf, P.,, Muhle, S.,, Menten, K. M., Nakanishi, K., Rivilla, Víctor M., Meier, David S., Harada, N., Emig, K. L., Menten, K.,, Emig, K., Yoshimura, Y., Sakamoto, K, Herrero-Illana, R, Yoshimura, Y.,, S. Aalto, Henkel, C.,, S. Viti, S. Martín, Mangum, J. G.,, K.-Y. Huang, Nakanishi, Kouichiro, Mangum, J, Humire, P. K., Huang, K. -Y., Aladro, Rebeca, Colzi, L., Tanaka, Kunihiko, Mühle, S., Emig, K.L., Caux, Emmanuel, Menten, KM, Muller, Sebastien, Nakanishi, Kouichiro,, P. P. van der Werf, Gorski, Mark,, Huang, K. Y., Colzi, Laura, Aladro, Rebeca,, R. Mauersberger, Meier, D., Hern\ue1ndez-G\uf3mez, A., Muller, Sebastien,, Menten, K., Humire, P.K., Werf, P.P. van der, Caux, E.,, Rivilla, V. M., Caux, E, Y. Yoshimura, Humire, PK, R. Herrero-Illana, Yoshimura, Y, van der Werf, P., N. Harada, Hernández-Gómez, Antonio, Aalto, Susanne, Werf, Paul van der, Herrero-Illana, Rubén, Herrero-Illana, R., Huang, K.Y., Huang, K-Y, Huang, Ko-Yun, Colzi, L, Hernández-Gómez, A, Caux, E., S. Mühle, P. K. Humire, Colzi, L.,, Huang, K. Y.,, van der Werf, P. P., van der Werf, PP, Humire, P., Aladro, R, M. Gorski, Meier, DS, Sakamoto, K., Henkel, C, J. Mangum, K. L. Emig, Emig, K.L.,, E. Caux, Nakanishi, K, Martin, S, Viti, S, K. M. Menten, Martín, Sergio, Rivilla, V\uedctor M., K. Nakanishi, Meier, D. S., Harada, N.,, Viti, S., R. Aladro, Rivilla, V.M., Hernández-Gómez, A., Gorski, Mark, Humire, Pedro, A. Hernández-Gómez, Muller, S, L. Colzi, Viti, Serena,, Gorski, M, V. M. Rivilla, Martín, S., Mangum, J. G., Emig, Kimberly L., Herrero-Illana, R.,, C. Henkel, Meier, D. S.,, Gorski, M., K. Tanaka, Rivilla, V., Rivilla, Víctor M.,, Harada, N, Mangum, J., Hernández-Gómez, A.,   +142 more
core   +1 more source

Statistical Study on L‐O Mode Saturn Kilometric Radiation

Geophysical Research Letters, Volume 52, Issue 15, 16 August 2025.
Abstract Based on the 13 years‐long observation of Saturn kilometric radiation (SKR) by the Cassini/Radio and Plasma Wave Science instrument, this study derives statistics for left‐hand (L‐O) mode SKR emissions. These emissions span a frequency range from below 10 kHz to approximately 1,000 kHz, with spectral flux densities ranging between 10−24 and 10−
Junhao Pan, Siyuan Wu, Shengyi Ye, Georg Fischer, Laurent Lamy, Philippe Zarka, Ulrich Taubenschuss   +6 more
wiley   +1 more source

Numerical simulation of astrophysical cyclotron-maser emission [PDF]

2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013
Numerical simulations have been conducted at the University of Strathclyde to study the spatial growth rate and emission topology of the cyclotron maser instability responsible for auroral magnetospheric radio emission from stars and planets and intense non-thermal radio emission in other astrophysical contexts.
Speirs, D. C., McConville, S. L., Gillespie, K. M., Phelps, A.D.R., Cross, A. W., Ronald, K.   +5 more
openaire   +3 more sources

Spatial Distribution and Plasmaspheric Ducting of Auroral Kilometric Radiation Revealed by Wind, Polar, and Arase

AGU Advances, Volume 6, Issue 4, August 2025.
Abstract Auroral Kilometric Radiation (AKR), the dominant radio emission from Earth, has been extensively studied, though previous analyses were constrained by limited spacecraft coverage. This study utilizes long‐term observations from Polar, Wind, and Arase spacecraft to generate comprehensive global AKR occurrence rate maps, revealing a high ...
Siyuan Wu, Daniel K. Whiter, Sai Zhang, Ulrich Taubenschuss, Philippe Zarka, Georg Fischer, Laurent Lamy, Shengyi Ye, James Waters, Baptiste Cecconi, Ping Li, Caitriona M. Jackman, Alexandra R. Fogg, Claire Baskevitch, Yoshiya Kasahara, Yasumasa Kasaba   +15 more
wiley   +1 more source

H2O Masers and Supersonic Turbulence

, 2017
We use unpublished and published VLBI results to investigate the geometry and the statistical properties of the velocity field traced by H2O masers in five galactic regions of star formation — Sgr B2(M), W49N, W51(MAIN), W51N, and W3(OH).
Holder, B. P., Gezari, S., Reid, Malcolm, Strelnitski, V., Moran, James, Alexander, J.   +5 more
core   +1 more source