Results 71 to 80 of about 173 (158)

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

An Updated Model for the Perseus Spiral Arm from Trigonometric Parallax and 3D Kinematic Distances of Distant Massive Stars

The Astrophysical Journal
We report trigonometric parallaxes and proper motions for three water masers and one methanol maser obtained with the Very Long Baseline Array as part of the Bar and Spiral Structure Legacy Survey.
L. J. Hyland, M. J. Reid, S. P. Ellingsen, A. Brunthaler, X. W. Zheng, K. M. Menten   +5 more
doaj   +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, Okouma P, Maina E, Ianjamasimanana R, Zambou S.   +4 more
europepmc   +1 more source

Bar-driven Shocks in NGC 1365 Revealed by the Most Luminous Extragalactic Class I Methanol Maser

The Astrophysical Journal Letters
We report the first detection of the 36.2 GHz (4 _−1  → 3 _0  E) Class I methanol (CH _3 OH) maser in the central region of the barred spiral galaxy NGC 1365.
Xi Chen, Tian Yang, Shimin Song, Simon Ellingsen, Shari Breen, Tiege McCarthy, Wenjin Yang, Ye-Wei Mao   +7 more
doaj   +1 more source

The 36 GHz Class I Methanol Maser in NGC 4945: A Tracer of Active Galactic Nucleus-driven Outflow–Interstellar Medium Interaction

The Astrophysical Journal Letters
Extragalactic Class I methanol masers are well-established tracers of bar-driven shocks in several nearby galaxies, but whether active galactic nucleus (AGN)-driven outflows can also excite such masers has remained unclear.
Xi Chen, Tian Yang, Shimin Song, Tiege McCarthy, Xiaoyun Xu, Simon Ellingsen, Shari Breen   +6 more
doaj   +1 more source

Field and intensity correlations: the Siegert relation from stars to quantum emitters. [PDF]

Eur Phys J D At Mol Opt Phys, 2022
Lassègues P, Biscassi MAF, Morisse M, Cidrim A, Matthews N, Labeyrie G, Rivet JP, Vakili F, Kaiser R, Guerin W, Bachelard R, Hugbart M.   +11 more
europepmc   +1 more source

Rapid time variations and radiative instabilities of astrophysical masers

The Astrophysical Journal, 1992
The time-varying intensities are obtained for astrophysical masers that are radiatively unstable. Numerical integrations of the time-dependent, nonlinear equations of radiative transfer are performed with the usual approximation of a linear maser.
Gerardo A. Scappaticci, William D. Watson   +1 more
openaire   +1 more source

A Millimeter Methanol Maser Ring Tracing the Deceleration of the Heat Wave Powered by the Massive Protostellar Accretion Outburst in G358.93–0.03 MM1

The Astrophysical Journal Letters
We present multiepoch, multiband Atacama Large Millimeter/submillimeter Array imaging of the new Class II millimeter methanol masers excited during the accretion outburst of the massive protostar G358.93−0.03 MM1. The highest angular resolution image (24
T. R. Hunter, C. L. Brogan, G. C. MacLeod, C. J. Cyganowski, R. A. Burns, B. A. McGuire   +5 more
doaj   +1 more source

Variabilities of Methanol Maser and Thermal Molecular Lines from an Accretion Burst Source G358.93-0.03

The Astronomical Journal
From 2019 January to June, the high-mass young stellar object G358.93-0.03 underwent a remarkable accretion burst. Detecting variations in the physical and kinematic environments during episodic accretion is essential for exploring such events. Searching
Shi-jie Zhang, Xi Chen, Yan-Kun Zhang, Dan Miao, Deng-Rong Lu, Bing-Gang Ju   +5 more
doaj   +1 more source

Cumulene carbenes in TMC-1: Astronomical discovery of <i>l</i>-H₂C₅ ^★. [PDF]

Astron Astrophys, 2021
Cabezas C, Tercero B, Agúndez M, Marcelino N, Pardo JR, de Vicente P, Cernicharo J.   +6 more
europepmc   +1 more source