Results 91 to 100 of about 4,740 (197)

The electron–cyclotron maser for astrophysical application [PDF]

The Astronomy and Astrophysics Review, 2006
The electron–cyclotron maser is a process that generates coherent radiation from plasma. In the last two decades, it has gained increasing attention as a dominant mechanism of producing high-power radiation in natural high-temperature magnetized plasmas.
openaire   +3 more sources

Millimeter‐Wave WISP Search with Coherent Light‐Shining‐Through‐a‐Wall Toward the STAX Project

Annalen der Physik, Volume 536, Issue 1, January 2024.
This research article shows potential of millimeter waves for searching dark photons, one of the candidates of dark matter. By sharing a common reference signal, an excellent temporal coherency is achieved between production and detection of dark photons.
Akira Miyazaki, Tor Lofnes, Fritz Caspers, Paolo Spagnolo, John Jelonnek, Tobias Ruess, Johannes L. Steinmann, Manfred Thumm   +7 more
wiley   +1 more source

Testing OH Megamaser Identification Methods in H i Surveys: Updated Source-flagging Algorithms and New Detections in ALFALFA

The Astrophysical Journal
OH megamasers (OHMs) are extragalactic masers found primarily in gas-rich galaxy major mergers. To date, only ∼120 OHMs have been cataloged since their discovery in 1982, and efforts to identify distinct characteristics of OHM host galaxies have remained
Hayley Roberts, Jeremy Darling, Kelley M. Hess, Andrew J. Baker, Elizabeth A. K. Adams, Helga Dénes   +5 more
doaj   +1 more source

A Search for H2CO 6cm Emission toward Young Stellar Objects III: VLA Observations

, 2008
We report the results of our third survey for formaldehyde (H2CO) 6cm maser emission in the Galaxy. Using the Very Large Array, we detected two new H2CO maser sources (G23.01-0.41 and G25.83-0.18), thus increasing the sample of known H2CO maser regions ...
Boland W., Brand J., Caswell J. L., Caswell J. L., Caswell J. L., Codella C., Downes D., E. D. Araya, Forster J. R., Forster J. R., Forster J. R., Gardner F. F., H. Linz, Hill T., L. Olmi, MacLeod G. C., P. Hofner, S. Kurtz, Slysh V. I., W. M. Goss, Whiteoak J. B., Xu Y.   +21 more
core   +1 more source

The first detection of the 232 GHz vibrationally excited H2O maser in Orion KL with ALMA

, 2012
We investigated the ALMA science verification data of Orion KL and found a spectral signature of the vibrationally excited H2O maser line at 232.68670 GHz (nu2=1, 5,5,0-6,4,3).
Beuther, Blake, Chapman, Gaume, Hirota, Hirota, Humphreys, Kim, Reid, Zapata, Zapata   +10 more
core   +1 more source

Magnetic reconnection as the driving factor behind high-mass protostellar luminosity flares

Communications Physics
Magnetic reconnection, a critical process in astrophysical luminosity outbursts like solar flares, may also underpin such events in high-mass young stellar objects (HMYSOs).
Xi Chen, Jun-Ting Liu, Olga S. Bayandina, Shi-Min Song, Sergey Khaibrakhmanov, Andrej M. Sobolev, Sheng-Yuan Liu, Zhi-Wei Chen, Da-Lei Li, Bin Li, Bo Xia, Zhi-Qiang Shen, Tie Liu, Pak-Shing Li, Xiao-Juan Zhang   +14 more
doaj   +1 more source

Detections of Compact Radio Continuum toward Methanol Maser Rings Using the VLA

The Astrophysical Journal
High-mass protostars are deeply embedded in dust inside their natal cores and are not easily detectable. However, maser emission at centimeter wavelengths, owing to its high brightness, enables us to study gas kinematics in protostars’ circumstellar ...
Anna Bartkiewicz, Olga Bayandina, Alberto Sanna, Marian Szymczak, Luca Moscadelli, Agnieszka Kobak, Huib Jan van Langevelde, Ashwin Varma   +7 more
doaj   +1 more source

Astrophysical constraints on the proton-to-electron mass ratio with FAST

, 2019
That the laws of physics are the same at all times and places throughout the Universe is one of the basic assumptions of physics. Astronomical observations provide the only means to test this basic assumption on cosmological time and distance scales. The
Chen, Xi, Ellingsen, Simon P., Mei, Ying
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

Astrophysical Lasers Operating in optical Fe II Lines Lines in Stellar Ejecta of Eta Carinae

, 2004
After the discovery of space masers based on OH radicals (Weaver et al, 1965) and H2O (Cheung et al, 1969) such microwave lasers have been found to work in more than 100 molecular species (Elitzur, 1992; Townes, 1997), as well as in highly excited H ...
Allen, Bergeson, Betz, Bowen, Casperson, Cheung, Davidson, Hamann, Harper, Hartman, Hillier, Johansson, Johansson, Johansson, Johansson, Johansson, Johansson, Johnson, Jordan, Kimble, Klimov, Lavrinovich, Letokhov, Litvak, Mumma, Reid, S. Johansson, Schawlow, Smith, Strelnitskii, Thackeray, Townes, V. S. Letokhov, Verner, Weaver, Weigelt   +35 more
core   +1 more source