Results 31 to 40 of about 4,740 (197)

Astrophysical Maser Radiation from a Turbulent Medium: Application to 25 GHz Methanol Masers [PDF]

The Astrophysical Journal, 1998
Spectral and spatial distributions are calculated for astrophysical maser radiation that emerges from a turbulent medium. Turbulent-velocity fields are created by sampling from Kolmogorov-like distributions. The maps of maser emission created in a turbulent medium appear as if the emission results from a collection of isolated clumps moving with ...
Sobolev, A. M., Wallin, B.K., Watson, W. D.   +2 more
openaire   +2 more sources

RadioAstron space-VLBI project: studies of masers in star forming regions of our Galaxy and megamasers in external galaxies [PDF]

, 2017
Observations of the masers in the course of RadioAstron mission yielded detections of fringes for a number of sources in both water and hydroxyl maser transitions. Several sources display numerous ultra-compact details. This proves that implementation of
Alakoz, A. V., Baan, W. A., Shakhvorostova, N. N., Sobolev, A. M.   +3 more
core   +1 more source

Stellar masers, circumstellar envelopes, and supernova remnants

, 2007
This paper reviews recent advances in the study or circumstellar masers and masers found toward supernova remnants. The review is organized by science focus area, including the astrophysics of extended stellar atmospheres, stellar mass-loss processes and
Alvarez, Athol J. Kemball, Bessel, Colomer, Cotton, Cotton, Deguchi, Goss, Habing, Humphreys, Imai, Menten, Morris, Pardo, Sevenster, Sevenster, Sevenster, Soria-Ruiz, Szczerba, van Langevelde, Vlemmings, Vlemmings, Wittkowski, Yi   +23 more
core   +1 more source

A New Galactic 6cm Formaldehyde Maser [PDF]

, 2006
We report the detection of a new H2CO maser in the massive star forming region G23.71-0.20 (IRAS 18324-0820), i.e., the fifth region in the Galaxy where H2CO maser emission has been found. The new H2CO maser is located toward a compact HII region, and is
Boland W., Bronfman L., Casoli F., Cesaroni R., E. Araya, H. Linz, Han F., Henkel C., L. Olmi, P. Hofner, S. Kurtz, Schutte A. J., W. M. Goss   +12 more
core   +2 more sources

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

Recent Developments in Maser Theory

, 2007
This review covers selected developments in maser theory since the previous meeting, "Cosmic Masers: From Proto-Stars to Black Holes" (Migenes & Reid 2002).
De, De, Henkel, Kraus, Martin, Moshe Elitzur, Parra, Rieu   +7 more
core   +1 more source

GASKAP -- The Galactic ASKAP Survey [PDF]

, 2012
A survey of the Milky Way disk and the Magellanic System at the wavelengths of the 21-cm atomic hydrogen (HI) line and three 18-cm lines of the OH molecule will be carried out with the Australian Square Kilometre Array Pathfinder telescope.
A. Alberdi, A. Begum, A. Green, A. S. Hill, Andrew Walsh, B. Koribalski, B. Wakker, B. Winkel, B.-C. Koo, B.-Q. For, Baud, Bournaud, Breen, Brüns, C. R. Kerton, Caswell, Cichowolski, Cornwell, Crovisier, D. Leahy, D. McConnell, D. Nidever, D. Tafoya, D. Wu, Dickey, F. J. Lockman, Forster, G. Anglada, G. Joncas, Gibson, Green, H. Alyson Ford, H. Arce, Hennebelle, Hiroshi Imai, Hulsbosch, Högbom, Imai, J. A. Green, J. Bland-Hawthorn, J. Dawson, J. E. G. Peek, J. English, J. Nakashima, J. Rathborne, J.-H. Kang, Jacco Th. Van Loon, John M. Dickey, Johnston, José F. Gómez, K. A. Douglas, K. Bekki, Kalberla, Kalberla, Kerp, L. Staveley-Smith, L. Uscanga, Liszt, Liszt, Liszt, M. Bailey, M. Burton, M. Cunningham, M. Hoare, M. Voronkov, Marx, N. Ben Bekhti, N. Lo, Naomi McClure-Griffiths, Olano, P. Diamond, P. Kalberla, Paul Jones, Putman, Rau, S. Ellingsen, S. Gulyaev, Sevenster, Sjouwerman, Snežana Stanimirović, Stanimirović, Steven J. Gibson, T. Foster, T. Westmeier, Turner, V. Migenes, van Loon, Verheijen, W. Tian, Wakker, Wakker, Y. Gomez, Y. Zhang, Zijlstra   +93 more
core   +5 more sources

Radiative Instabilities in Three-dimensional Astrophysical Masers [PDF]

The Astrophysical Journal, 1995
Inherent instabilities in the radiative transfer for astrophysical masers have been recognized and calculated in the linear maser idealization in our previous investigations. The same instabilities are now shown to occur in the more realistic, three-dimensional geometries.
Gerardo A. Scappaticci, William D. Watson   +1 more
openaire   +1 more source

Masers

, 2011
An astrophysical MASER (Microwave Amplification by Stimulated Emission of Radiation) is a source of stimulated spectral line emission. Maser emission is observed from the circumstellar envelopes of evolved stars, molecular clouds/star-forming regions ...
Humphreys, Elizabeth
core   +1 more source

Long-term Variability of H$_2$CO Masers in Star-forming Regions [PDF]

, 2017
We present results of a multi-epoch monitoring program on variability of 6$\,$cm formaldehyde (H$_2$CO) masers in the massive star forming region NGC$\,$7538$\,$IRS$\,$1 from 2008 to 2015 conducted with the GBT, WSRT, and VLA.
Andreev, N., Araya, E. D., Hoffman, I. M., Hofner, P., Kurtz, S., Linz, H., Lorran-Costa, I., Olmi, L.   +7 more
core   +2 more sources