Results 1 to 10 of about 7,116 (192)

VLA observations of water masers towards 6.7 GHz methanol maser sources [PDF]

Astronomy & Astrophysics, 2010
22 GHz water and 6.7 GHz methanol masers are usually thought as signposts of early stages of high-mass star formation but little is known about their associations and the physical environments they occur in. The aim was to obtain accurate positions and
A. Bartkiewicz, A. Brunthaler, Bartkiewicz, Bartkiewicz, Brunthaler, Beuther, Brand, Breen, Breen, Caswell, Cragg, Cyganowski, Cyganowski, Davis, De Buizer, De Buizer, Dodson, Elitzur, Fazio, H. J. van Langevelde, M. J. Reid, M. Szymczak, McCaughrean, Menten, Minier, Moscadelli, Moscadelli, Norris, Palla, Pestalozzi, Philips, Pillai, Reid, Rygl, Smith, Sridharan, Szymczak, Szymczak, Szymczak, Urquhart, van der Walt, van der Walt, Walsh, Xu, Y. M. Pihlström   +43 more
core   +2 more sources

Water Masers in the Andromeda Galaxy: I. A Survey for Water Masers, Ammonia, and Hydrogen Recombination Lines [PDF]

The Astrophysical Journal, 2016
We report the results of a Green Bank Telescope survey for water masers, ammonia (1,1) and (2,2), and the H66-alpha recombination line toward 506 luminous compact 24 micron-emitting regions in the Andromeda Galaxy (M31).
Amiri, Nikta, Darling, Jeremy, Gerard, Benjamin, Lawrence, Kelsey   +3 more
core   +2 more sources

The Parallax and 3D Kinematics of Water Masers in the Massive Star-forming Region G034.43+0.24

The Astrophysical Journal, 2023
We report a measurement of the trigonometric parallax of 22 GHz water masers in the massive star-forming region G034.43+0.24 as part of the Bar and Spiral Structure Legacy Survey using the Very Long Baseline Array.
Xiaofeng Mai, Bo Zhang, M. J. Reid, L. Moscadelli, Shuangjing Xu, Yan Sun, Jingdong Zhang, Wen Chen, Shiming Wen, Qiuyi Luo, Karl M. Menten, Xingwu Zheng, Andreas Brunthaler, Ye Xu, Guangli Wang   +14 more
doaj   +1 more source

Unusually Powerful Flare Phenomenon of the Water Maser in W51 and the Possibility of Detecting Gravitational Radiation from It

The Astrophysical Journal, 2023
Because of detailed monitoring of the 22.2 GHz water maser, carried out from 2021 October to 2023 May, a very powerful flare phenomenon was detected in the galactic object W51 near the radial velocity of 60 km s ^−1 with the amplitude of 140 kJy.
A. E. Volvach, L. N. Volvach, M. G. Larionov   +2 more
doaj   +1 more source

Physical Environments of the Luminosity Outburst Source NGC 6334I Traced by Thermal and Maser Lines of Multiple Molecules

The Astrophysical Journal Supplement Series, 2023
We have conducted a systematic line survey, primarily focused on transitions of the methanol and ammonia molecules, and monitoring observations of masers toward the high-mass star-forming region NGC 6334I.
Jiong-Heng Wu, Xi Chen, Yan-Kun Zhang, Simon P. Ellingsen, Andrej M. Sobolev, Zhang Zhao, Shi-Ming Song, Zhi-Qiang Shen, Bin Li, Bo Xia, Rong-Bin Zhao, Jing-Qing Wang, Ya-Jun Wu   +12 more
doaj   +1 more source

Simultaneous Time-monitoring Observations of H2O and SiO Masers toward the Supergiant VX Sagittarii

The Astrophysical Journal Supplement Series, 2023
We performed simultaneous monitoring observations of the 22.2 GHz H _2 O and 43.1/42.8/86.2/129.3 GHz SiO masers toward the red supergiant VX Sagittarii using the Korean VLBI Network single-dish telescopes.
Dong-Hwan Yoon, Se-Hyung Cho, Haneul Yang, Youngjoo Yun, Jaeheon Kim   +4 more
doaj   +1 more source

Water maser emission in IC 342 [PDF]

Astronomy & Astrophysics, 2002
The detection of 22 GHz water vapor emission from IC342 is reported, raising the detection rate among northern galaxies with 100 micron IRAS point source fluxes > 50 Jy to 16%. The maser, associated with a star forming region 10-15 arcsec west of the nucleus, consists of a single 0.5 km/s wide feature and reaches an isotropic luminosity of 0.01 ...
Tarchi A., Henkel C., Peck A. B., Menten K.M.   +3 more
openaire   +3 more sources

183 GHz Water Megamasers in Active Galactic Nuclei: A New Accretion Disk Tracer

The Astrophysical Journal, 2023
We present the results of an Atacama Large Millimeter/submillimeter Array survey to identify 183 GHz H _2 O maser emission from active galactic nuclei (AGNs) already known to host 22 GHz megamaser systems.
Dominic W. Pesce, James A. Braatz, Christian Henkel, Elizabeth M. L. Humphreys, C. M. Violette Impellizzeri, Cheng-Yu Kuo   +5 more
doaj   +1 more source

Evolution of the Outflow in the Water Fountain Source IRAS 18043–2116

The Astrophysical Journal, 2023
We present the spectral and spatial evolution of H _2 O masers associated with the water fountain source IRAS 18043−2116, found in observations with the Nobeyama 45 m Telescope and the Australia Telescope Compact Array. We have found new highest-velocity
L. Uscanga, H. Imai, J. F. Gómez, D. Tafoya, G. Orosz, T. P. McCarthy, Y. Hamae, K. Amada   +7 more
doaj   +1 more source

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