Results 71 to 80 of about 176 (166)

Time variability of astrophysical masers [PDF]

Monthly Notices of the Royal Astronomical Society, 1978
M. Salem, M. S. Middleton
openaire   +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

Survey of S-type AGB Stars Using the KVN Four-band Receiving System: SMASTES II

The Astronomical Journal
We present the observational results of Simultaneous Multi-mAser Survey Toward Evolved Stars (SMASTES) II for 150 S-type asymptotic giant branch stars. Observations have been performed from 2023 September to 2024 March using the upgraded wide four-band ...
Seong-Min Son, Se-Hyung Cho, Jaeheon Kim, Hyeon Baek, Dong-Hwan Yoon, Kyung-Won Suh   +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

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

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

Maser Radiation in an Astrophysical Context (Overview)

, 2013
In this paper we will look at the phenomenon of Microwave Amplification by Stimulated Emission of Radiation (a maser system). We begin by deriving amplification by stimulated emission using time-dependent perturbation theory, in which the perturbation provided by external radiation.
openaire   +2 more sources

Survey of Oxygen-rich AGB Stars Using the KVN 4 Receiving Bands—SMASTES. I.

The Astronomical Journal
Simultaneous observations of 19 H _2 O and SiO maser and thermal lines were performed toward 155 M-type oxygen-rich (O-rich) AGB stars. We used the upgraded four-band (22/43/86/129 GHz) wide receiving system of the Korean VLBI Network (KVN).
Hyeon Baek, Se-Hyung Cho, Jaeheon Kim, Seung-Min Son, Dong-Hwan Yoon, Kyung-Won Suh   +5 more
doaj   +1 more source