Results 11 to 20 of about 63 (52)

Masers: Precision probes of molecular gas [PDF]

, 2019
International audienceMaser emission from water, methanol, silicon monoxide and other molecules can reach brightness temperatures K. Such observations can achieve sub-pc precision for discs around black holes or sub-au scale interactions in protostellar
Decin, L., Richards, A.MS., Etoka, S., Humphreys, E.M.L., Richards, A. M. S., Baudry, A., Humphreys, E. M. L., Sobolev, A., Gray, M.D., Humphreys, E.ML., Decin, L.,, Gray, M. D.,, Sobolev, A. M.,, Humphreys, E. M.L., Vlemmings, W., Richards, A.M.S.,, Richards, A.M.S., Herpin, F., Vlemmings, Wouter, Etoka, S.,, Vlemmings, Wouter,, Herpin, Fabrice, Humphreys, L., Gray, M. D., Humphreys, E.,, Sobolev, A. M., Baudry, A.,, Humphreys, E., Richards, A. M.S., Herpin, F.,, Baudry, Alain   +30 more
core   +1 more source

A Survey of SiO J = 1 – 0 emission toward massive star-forming regions [PDF]

, 2023
Aims. The application of silicon monoxide (SiO) as a shock tracer arises from its propensity to occur in the gas phase as a result of shock-induced phenomena, including outflow activity and interactions between molecular clouds and expanding Hii regions ...
Kim, W. -J., J. S. Urquhart, W.-J. Kim, Fuller, G., G. A. Fuller, Urquhart, J.S., Fuller, G.A., Kim, K-T, K-T Kim, Kim, W., Urquhart, J., Kim, K., Kim, W.-J., V. S. Veena, Schilke, P., P. Schilke, K.-T. Kim, Fuller, G. A., Veena, V.S., Veena, V., Urquhart, J. S., Veena, V. S.   +21 more
core   +1 more source

Is there a maser in the silicon monoxide ground state

The Astrophysical Journal, 1975
Observations are reported of weak emission from the ground vibrational state of SiO in the Orion molecular cloud. It is shown that this emission has a rather smooth low-intensity profile extending over a large velocity range and is present at velocities where maser emissions from the first and second vibrational states are absent.
D. Buhl, L. E. Snyder, F. J. Lovas, D. R. Johnson   +3 more
openaire   +1 more source

The Astrometric Animation of Water Masers towards the Mira Variable BX Cam

, 2022
We report VLBI monitoring observations of the 22 GHz water (H$_{2}$O) masers around the Mira variable BX Cam, which were carried out as a part of the EAVN Synthesis of Stellar Maser Animations (ESTEMA) project.
Chibueze, J. O., Amada, K., Xu, Shuangjing, Rioja, M. J., Jung, Taehyun, Zhang, Bo, Sobolev, Andrey, Wen, Shiming, Cho, Se-Hyung, Kim, Jaeheon, Rioja, Maria, Kim, D. -J., Amada, Kei, Cui, L., Yonekura, Y., Oyadomari, Miyako, Orosz, G., Chibueze, James O., Sobolev, A. M., Dodson, Richard, Oh, S., Yonekura, Yoshinori, Yun, Youngjoo, Oyadomari, M., Sun, Yan, Kim, Dong-Jin, Yun, Y., Nakashima, J. -I., Chibueze, James, Wen, S., Orosz, Gabor, Oh, Sejin, Zhang, B., Imai, H., Mai, X., Zhang, J., Zhang, Jingdong, Xu, S., Cui, Lang, Sobolev, Andrey M., Imai, Hiroshi, Kim, J., Dodson, R., Rioja, Maria J., Jung, T., Mai, Xiaofeng, Sun, Y., Cho, S. -H., Nakashima, Jun-ichi   +48 more
core   +1 more source

Correlation between SiO v = 3 J = 1 → 0 maser excitation and the light curve of a long-period variable star [PDF]

, 2018
In order to understand the excitation mechanisms of silicon monoxide (SiO) masers around long-period variables (LPVs), we have investigated distributions of the SiO v = 2 and v = 3 J = 1 → 0 masers around 12 LPVs by very long baseline interferometry ...
Takumi Nagayama, Matsumoto, N., Oyadomari, M., Jun-ichi Nakashima, Oyama, T., Tomoaki Oyama, Nagayama, T., Nakashima, J. -I., Hiroshi Imai, Miyako Oyadomari, Naoko Matsumoto, Imai, H., Cho, S. -H., Se-Hyung Cho   +13 more
core   +1 more source

SiO, 29SiO, and 30SiO Emission from 67 Oxygen-rich Stars: A Survey of 61 Maser Lines from 7 to 1 mm

, 2022
16 pags., 11 figs., 7 tabs. -- Unified Astronomy Thesaurus concepts: Silicon monoxide masers (1458); Asymptotic giant branch (108); Interstellar medium (847); Interstellar molecules (849); Circumstellar envelopes (237); Stellar evolution (1599); Surveys
Rizzo, José Ricardo, García-Miró, C., Cernicharo, José   +2 more
core   +1 more source

SiO maser movies

, 2000
We show how the intensity and spatial distribution of silicon monoxide masers varies with time according to the parameters of a current model. The variation of the masers at 43 GHz in the v=1 vibrational state is presented as an animation. Where possible,
Humphreys, E. M L, E.M.L. Humphreys, Gray, M. D., M.D. Gray   +3 more
core   +1 more source

Maser Investigation toward Off-Plane Stars (MIOPS): Detection of SiO Masers in the Galactic Thick Disk and Halo

The Astrophysical Journal
Studying stars that are located off the Galactic plane is important for understanding the formation history of the Milky Way. We searched for SiO masers toward off-plane O-rich asymptotic giant branch (AGB) stars from the catalog presented by Mauron et ...
Wenjin Yang, Yuanwei Wu, Yan Gong, Nicolas Mauron, Bo Zhang, Karl M. Menten, Xiaofeng Mai, Dejian Liu, Juan Li, Jingjing Li   +9 more
doaj   +1 more source

Investigating Asymmetry Development from SiO to H2O Maser Regions in VX Sagittarii

The Astronomical Journal
Simultaneous very-long-baseline interferometry monitoring observations of H _2 O and SiO masers toward VX Sagittarii were conducted from 2014 February to 2019 January.
Dong-Hwan Yoon, Se-Hyung Cho, Youngjoo Yun, Haneul Yang, Jaeheon Kim   +4 more
doaj   +1 more source

Maser Polarization and magnetic fields

, 2012
Maser polarization observations can reveal unique information on the magnetic field strength and structure for a large number of very different astronomical objects.
Vlemmings, Wouter, Vlemmings, Wouter,
core   +1 more source