Water Maser Emission from Comets
The Astronomical Journal, 2000 We used the Very Large Array in 1997 January, February, March, and April to observe comet Hale-Bopp in the 1.35 cm H2O line. No line was detected in any of the four observations, and upper limits to the H2O line emission are presented. These upper limits are typically around 60 mJy, which is much lower than the ~2.5 Jy flux density reported for this ...
Ashley P. Graham +4 more
openaire +1 more source
Milliarcsecond structure of water maser emission in two young high-mass stellar objects associated with methanol masers [PDF]
, 2012 Context. The 22.2 GHz water masers are often associated with the 6.7 GHz methanol masers but owing to the different excitation conditions they likely probe independent spatial and kinematic regions around the powering young massive star. Aims.
A. Bartkiewicz +5 more
core +1 more source
Water Masers in W49N - The Youngest Stellar Jet?
, 1992 Observations by Gwinn, Moran, and Reid of the proper motions of water masers in W49N show that they have an elongated distribution expanding from a common center.
Elitzur, Moshe, Low, Mordecai-Mark Mac
core +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 +3 more
core +1 more source
Inner Workings: Astronomers are redrawing our corner of the Milky Way. [PDF]
Proc Natl Acad Sci U S A, 2021 Croswell K.
europepmc +1 more source
Flaring water masers associated with W49N [PDF]
, 2019 Aims. We present our monitoring observations and analysis of water masers associated with W49N taken in 2017 and 2018. A significant flare occurred during these observations. Methods. We used ground-based radio telescopes in Simeiz (RT-22), Torun (RT-32),
ZANICHELLI, Alessandra +32 more
core +1 more source
Radio Astronomical Antennas in the Central African Region to Improve the Sampling Function of the VLBI Network in the SKA Era? [PDF]
Sensors (Basel), 2022 Atemkeng M +4 more
europepmc +1 more source
Excitation of millimeter and submillimeter water masers
The Astrophysical Journal, 1991 The excitation of maser emission in millimeter and submillimeter transitions of interstellar and circumstellar water is considered. An escape probability method is used to determine the equilibrium populations in 349 rotational states of both ortho- and para-water under varying conditions of gas temperature, density, water abundance, and radiation ...
David A. Neufeld, Gary J. Melnick
openaire +1 more source
Measuring Magnetic Fields from Water Masers Associated with the Synchrotron Protostellar Jet in W3(H2O) [PDF]
, 2018 The Turner-Welch Object in the W3(OH) high-mass star forming complex drives a synchrotron jet, which is quite exceptional for a high-mass protostar, and is associated with a strongly polarized water maser source, W3(H2O), making it an optimal target to ...
Gabriele Surcis +5 more
core +1 more source
OBSERVATIONS OF MASSIVE STAR-FORMING REGIONS WITH WATER MASERS: MID-INFRARED IMAGING
, 2004 We present here a mid-infrared imaging survey of 26 sites of water maser emission. Observations were obtained at the Infrared Telescope Facility 3 m telescope with the University of Florida mid-infrared imager/spectrometer OSCIR, and the JPL mid-infrared
C. M. Telesco +3 more
core