Results 101 to 110 of about 4,740 (197)

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

Maser radiation from astrophysical jets

, 2016
Electromagnetic radiation from jets is normally considered to be incoherent synchrotron emission. Some aspects of radiation from both stellar and extragalactic jets could, however, be due to coherent emission mechanisms. Coherent radiation mechanisms have the advantage of being able to account for the high brightness temperatures inferred from some ...
Bingham, R, Cairns, R, Dawson, J, Tonge, J, Mendonca, J   +4 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

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

Understanding Accretion Outbursts in Massive Protostars through Maser Imaging

, 2019
The bright maser emission produced by several molecular species at centimeter to long millimeter wavelengths provides an essential tool for understanding the process of massive star formation. Unimpeded by the high dust optical depths that affect shorter
Bartkiewicz, Anna, Brisken, Walter, Brogan, Crystal L., Burns, Ross, Chibueze, James O., Cyganowski, Claudia J., Hirota, Tomoya, Hunter, Todd R., MacLeod, Gordon, Sanna, Alberto, Torrelles, José-María   +10 more
core  

Maser Emission in Astrophysical Plasmas: 2003 Robert Ellery Lecture [PDF]

Publications of the Astronomical Society of Australia, 2005
AbstractThere are three distinct types of ‘coherent emission’ in astrophysical plasmas: plasma emission (e.g. in solar radio bursts), electron cyclotron maser emission (e.g. in Jupiter's radio bursts), and pulsar radio emission. The development and current status of our understanding of coherent emission is reviewed, concentrating on plasma emission ...
openaire   +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

Numerical simulations of astrophysical cyclotron-maser emission [PDF]

, 2016
[Abstract unavailable]
Speirs, D. C., Bingham, R., Ronald, K., Phelps, A.D.R., McConville, S.L., Gillespie, K.M., Cairns, R. A., Kellett, B.J., Vorgul, I., Cross, A.W.   +9 more
openaire  

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