Results 1 to 10 of about 4,855 (170)

First Interstellar HCO$^+$ Maser [PDF]

The Astrophysical Journal, 2012
A previously unseen maser in the J = 1 - 0 transition of HCO$^+$ has been detected by the Combined Array for Millimeter-wave Astronomy (CARMA). A sub-arcsecond map was produced of the 2 arcmin$^2$ region around DR21(OH), which has had previous detections
Araya, Crutcher, Fish, Hakobian, Slysh, Zapata   +5 more
core   +2 more sources

Autonomous orbit determination and timekeeping in lunar distant retrograde orbits by observing X‐ray pulsars

NAVIGATION, Volume 68, Issue 4, Page 687-708, Winter 2021., 2021
Abstract A server satellite that is parked in a stable distant retrograde orbit (DRO) in the vicinity of the Moon can provide navigation service for satellites in the Earth–Moon system. In this study, X‐ray pulsar navigation (XPNAV) is investigated to determine the server's orbital position and velocity, and maintain its onboard timing autonomously to ...
Jiangkai Liu, Wenbin Wang, Hao Zhang, Leizheng Shu, Yang Gao   +4 more
wiley   +1 more source

Broadband VLA Spectral-line Survey of a Sample of Ionized Jet Candidates

The Astrophysical Journal Supplement Series, 2023
The study of the interaction between ionized jets, molecular outflows, and their environments is critical to understanding high-mass star formation, especially because jets and outflows are thought to be key in the transfer of angular momentum outward ...
E. Sanchez-Tovar, E. D. Araya, V. Rosero, P. Hofner, S. Kurtz   +4 more
doaj   +1 more source

Proper Motions of Water Masers in W49 N Measured by KaVA

The Astrophysical Journal, 2023
We report the proper motions of 22 GHz water masers toward W49 N that were observed by the KVN and VERA Array (KaVA) during 2017 February–May. We found 263, 268, and 310 features in three successive epochs; they were distributed in a region of size 4 × 4
Kitiyanee Asanok, Malcolm D. Gray, Tomoya Hirota, Koichiro Sugiyama, Montree Phetra, Busaba H. Kramer, Tie Liu, Kee-Tae Kim, Bannawit Pimpanuwat   +8 more
doaj   +1 more source

GASKAP -- The Galactic ASKAP Survey [PDF]

, 2012
A survey of the Milky Way disk and the Magellanic System at the wavelengths of the 21-cm atomic hydrogen (HI) line and three 18-cm lines of the OH molecule will be carried out with the Australian Square Kilometre Array Pathfinder telescope.
A. Alberdi, A. Begum, A. Green, A. S. Hill, Andrew Walsh, B. Koribalski, B. Wakker, B. Winkel, B.-C. Koo, B.-Q. For, Baud, Bournaud, Breen, Brüns, C. R. Kerton, Caswell, Cichowolski, Cornwell, Crovisier, D. Leahy, D. McConnell, D. Nidever, D. Tafoya, D. Wu, Dickey, F. J. Lockman, Forster, G. Anglada, G. Joncas, Gibson, Green, H. Alyson Ford, H. Arce, Hennebelle, Hiroshi Imai, Hulsbosch, Högbom, Imai, J. A. Green, J. Bland-Hawthorn, J. Dawson, J. E. G. Peek, J. English, J. Nakashima, J. Rathborne, J.-H. Kang, Jacco Th. Van Loon, John M. Dickey, Johnston, José F. Gómez, K. A. Douglas, K. Bekki, Kalberla, Kalberla, Kerp, L. Staveley-Smith, L. Uscanga, Liszt, Liszt, Liszt, M. Bailey, M. Burton, M. Cunningham, M. Hoare, M. Voronkov, Marx, N. Ben Bekhti, N. Lo, Naomi McClure-Griffiths, Olano, P. Diamond, P. Kalberla, Paul Jones, Putman, Rau, S. Ellingsen, S. Gulyaev, Sevenster, Sjouwerman, Snežana Stanimirović, Stanimirović, Steven J. Gibson, T. Foster, T. Westmeier, Turner, V. Migenes, van Loon, Verheijen, W. Tian, Wakker, Wakker, Y. Gomez, Y. Zhang, Zijlstra   +93 more
core   +9 more sources

Luminosity Outburst of a High-mass Young Stellar Object Triggered by the Surrounding Radiation Field

The Astrophysical Journal Letters, 2023
We present observations of the 6.7 GHz methanol and 4.8 GHz formaldehyde masers toward the high-mass young stellar object G24.33+0.14 (hereafter G24). Our observations were conducted from 2019 to 2021 using the Shanghai Tianma 65 m Radio Telescope and ...
Jun-Ting Liu, Xi Chen, Xiao-Dian Chen, Zhi-Wei Chen, Shi-Min Song, You-Xin Wang, Yan-Kun Zhang, Zhang Zhao, Bin Li, Bo Xia, Zhi-Qiang Shen   +10 more
doaj   +1 more source

Simultaneous Time-monitoring Observations of H2O and SiO Masers toward the Supergiant VX Sagittarii

The Astrophysical Journal Supplement Series, 2023
We performed simultaneous monitoring observations of the 22.2 GHz H _2 O and 43.1/42.8/86.2/129.3 GHz SiO masers toward the red supergiant VX Sagittarii using the Korean VLBI Network single-dish telescopes.
Dong-Hwan Yoon, Se-Hyung Cho, Haneul Yang, Youngjoo Yun, Jaeheon Kim   +4 more
doaj   +1 more source

Luminosity Outburst Energized by the Collision between the Infalling Streamer and Disk in W51 North

The Astronomical Journal, 2023
We report the detection of the disk/torus, outflow, and inflow structures traced by H _2 O masers toward a high-mass young stellar object W51 North during its H _2 O maser outburst stage using the Karl G. Jansky Very Large Array (VLA).
Yan-Kun Zhang, Xi Chen, Shi-Ming Song, You-Xin Wang   +3 more
doaj   +1 more source

The Discovery of the Zeeman Effect in 38 GHz Class II Methanol Masers

The Astrophysical Journal, 2023
Magnetic fields likely play an important role in star formation, but the number of directly measured magnetic field strengths remains scarce. We observed the 38.3 and 38.5 GHz Class II methanol (CH _3 OH) maser lines toward the high-mass star-forming ...
E. Momjian, A. P. Sarma
doaj   +1 more source

The Parallax and 3D Kinematics of Water Masers in the Massive Star-forming Region G034.43+0.24

The Astrophysical Journal, 2023
We report a measurement of the trigonometric parallax of 22 GHz water masers in the massive star-forming region G034.43+0.24 as part of the Bar and Spiral Structure Legacy Survey using the Very Long Baseline Array.
Xiaofeng Mai, Bo Zhang, M. J. Reid, L. Moscadelli, Shuangjing Xu, Yan Sun, Jingdong Zhang, Wen Chen, Shiming Wen, Qiuyi Luo, Karl M. Menten, Xingwu Zheng, Andreas Brunthaler, Ye Xu, Guangli Wang   +14 more
doaj   +1 more source