Results 91 to 100 of about 5,254,583 (200)
The Discovery of Polarized Water Vapor Megamaser Emission in a Molecular Accretion Disk
The Astrophysical Journal LettersFor the first time in an extragalactic source, we detect linearly polarized H _2 O maser emission associated with the molecular accretion disk of NGC 1068.
Jack F. Gallimore +5 more
doaj +1 more source
Protostellar Outflows at the EarliesT Stages (POETS)
Astronomy & AstrophysicsContext. Magnetohydrodynamic (MHD) disk winds (DWs) can be responsible for removing angular momentum from the accretion disks of protostars, for driving mass accretion and disk evolution and dispersal, and, ultimately, for setting the conditions for ...
Moscadelli L. +15 more
doaj +1 more source
CMZoom. IV. Incipient High-mass Star Formation throughout the Central Molecular Zone
The Astrophysical JournalIn this work, we constrain the star-forming properties of all possible sites of incipient high-mass star formation in the Milky Way’s Galactic Center.
H Perry Hatchfield +17 more
doaj +1 more source
Observing astrophysical water masers Observing windows Masers as diagnostics Beaming Precise measurements Shocks Magnetic fields Multiple lines Pumping conditions constrain physical conditions n, T ...
openaire +1 more source
Properties of H2O Masers and Their Associated Sources in Sagittarius B2
The Astrophysical JournalWe present high-resolution Karl G. Jansky Very Large Array observations of the 22 GHz H _2 O maser line in the extended Sagittarius B2 cloud. We detect 499 H _2 O masers across the observed velocities between −39 and 172 km s ^−1 .
Nazar Budaiev +7 more
doaj +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
On Water Masers in Circumstellar Shells
The Astrophysical Journal, 1998 Detection rates for 22 GHz water masers from O-rich circumstellar shells are always less than 100%. This can in part be understood by revisiting high angular-resolution observations of masers in OH 39.7 + 1.5 and red supergiants. The pattern of occurrence for water masers around the pulsation cycle of OH 39.7 + 1.5 suggests that a detectable maser only
openaire +1 more source
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
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
SiO and CH3OH mega-masers in NGC 1068
, 2014 Maser is an acronym for microwave amplification by stimulated emission of radiation; in astronomy mega-masers are masers in galaxies that are >= 10(6) times more luminous than typical galactic maser sources.
Gao, Yu +6 more
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