Results 11 to 20 of about 203 (158)

Proper Motions of Water Masers in W49 N Measured by KaVA

The Astrophysical Journal, 2023
We report the proper motions of 22 GHz water masers toward W49 N that were observed by the KVN and VERA Array (KaVA) during 2017 February–May. We found 263, 268, and 310 features in three successive epochs; they were distributed in a region of size 4 × 4
Kitiyanee Asanok, Malcolm D. Gray, Tomoya Hirota, Koichiro Sugiyama, Montree Phetra, Busaba H. Kramer, Tie Liu, Kee-Tae Kim, Bannawit Pimpanuwat   +8 more
doaj   +1 more source

WATER MASERS IN THE ANDROMEDA GALAXY. I. A SURVEY FOR WATER MASERS, AMMONIA, AND HYDROGEN RECOMBINATION LINES [PDF]

The Astrophysical Journal, 2016
ABSTRACT We report the results of a Green Bank Telescope survey for water masers, ammonia (1, 1) and (2, 2), and the H66α recombination line toward 506 luminous compact 24 μm emitting regions in the Andromeda Galaxy (M31). We include the 206 sources observed in the Darling water maser survey for completeness.
Jeremy Darling, Benjamin Gerard, Nikta Amiri, Kelsey Lawrence   +3 more
openaire   +2 more sources

WATER MASERS IN THE ANDROMEDA GALAXY. II. WHERE DO MASERS ARISE? [PDF]

The Astrophysical Journal, 2016
ABSTRACT We present a comparative multiwavelength analysis of water-maser-emitting regions and non-maser-emitting luminous 24 μm star-forming regions in the Andromeda Galaxy (M31) to identify the sites most likely to produce luminous water masers useful for astrometry and proper motion studies.
Nikta Amiri, Jeremy Darling
openaire   +2 more sources

Water Masers as an Early Tracer of Star Formation [PDF]

The Astrophysical Journal Supplement Series, 2022
Abstract We present a study of the correlation between 22 GHz water maser emission and far-infrared/submillimeter (IR/sub-mm) sources. The generalized linear model (GLM) is used to predict H2O maser detection in a particular source with defined physical parameters.
Dmitry A. Ladeyschikov, Yan Gong, Andrey M. Sobolev, Karl M. Menten, James S. Urquhart, Shari L. Breen, Nadezhda N. Shakhvorostova, Olga S. Bayandina, Alexander P. Tsivilev   +8 more
openaire   +3 more sources

Water Masers in Orion

The Astrophysical Journal, 1998
Measurements of the 616 → 523 line of H2O at 1.3 cm in the Orion region of star formation are reported. With a spatial resolution of ≈ 01, H2O maser emission was detected in two regions: Orion BN/KL and Orion S. The well-known masers in the BN/KL region are distributed in a 30'' by 30'' area. The "shell" masers, within the BN/KL region, are distributed
R. A. Gaume, T. L. Wilson, F. J. Vrba, K. J. Johnston, J. Schmid‐Burgk   +4 more
openaire   +1 more source

The Polarized Water Maser in Orion [PDF]

Symposium - International Astronomical Union, 1992
We present the results of 12 years of observations of the 8 km s−1 water maser in Orion. Four large flares in the flux density were observed, as well as variability in the degree and angle of polarization. The profile of the line is also variable, indicating the superposition of several sources.
Z. Abraham, J. W. S. Vilas Boas
openaire   +1 more source

Interacting masers and the extreme brightness of astrophysical water masers

The Astrophysical Journal, 1989
Extreme surface brightnesses have long been reported for water masers which are well beyond what is found in self-consistent, theoretical investigations of these masers. The transport of maser radiation is calculated when two masers, having the properties inferred for the numerous weaker masers and separated by distances characteristic of the molecular
Shuji Deguchi, William D. Watson
openaire   +1 more source

Water masers in the Kronian system [PDF]

Proceedings of the International Astronomical Union, 2009
AbstractThe presence of water has been considered for a long time as a key condition for life in planetary environments. The Cassini mission discovered water vapour in the Kronian system by detecting absorption of UV emission from a background star (Hansen et al. 2006).
Pogrebenko, Sergei V., Gurvits, Leonid I., Elitzur, Moshe, Cosmovici, Cristiano B., Avruch, Ian M., Pluchino, Salvatore, Montebugnoli, Stelio, Salerno, Emma, Maccaferri, Giuseppe, Mujunen, Ari, Ritakari, Jouko, Molera, Guifre, Wagner, Jan, Uunila, Minttu, Cimo, Giuseppe, Schilliro, Francesco, Bartolini, Marco, Fernández, J. A., Lazzaro, D., Prialnik, D., Schulz, R.   +20 more
openaire   +3 more sources

Supersonic Water Masers in 30 Doradus

The Astrophysical Journal, 2001
We report on extremely high velocity molecular gas, up to -80 km/s relative to the ambient medium, in the giant star-formation complex 30 Doradus in the Large Magellanic Cloud (LMC), as observed in new 22 GHz H2O maser emission spectra obtained with the Mopra radio telescope.
van Loon, Jacco Th., Zijlstra, Albert A.
openaire   +2 more sources

Probing AGN with Water Masers [PDF]

Symposium - International Astronomical Union, 1996
Observations of the angular distribution of the water masers in the nucleus of NGC4258 reveal the presence of a thin molecular disk in nearly perfect Keplerian orbit (Miyoshi et al., 1995; Moran et al., 1995). About 300 galaxies have been searched for nuclear water masers to a limiting sensitivity of about 0.1 Jy (e.g., Braatz, 1996); and 16 masers ...
J. M. Moran, L. J. Greenhill, J. R. Herrnstein, P. J. Diamond, M. Miyoshi, N. Nakai, M. Inoue   +6 more
openaire   +1 more source