Results 11 to 20 of about 478 (176)

CREATING THE RT-32 RADIO TELESCOPE ON THE BASIC OF MARK-4B ANTENNA SYSTEM. 2. ESTIMATION OF THE POSSIBILITY FOR MAKING SPECTRAL OBSERVATIONS OF RADIO ASTRONOMICAL OBJECTS

Radio Physics and Radio Astronomy, 2019
Purpose: Technical capabilities of the MARK-4B antenna system necessary for its further using as a 32-meter radiotelescope (RT-32) and making simultaneous spectral radioastronomical observations in the C and K frequency ranges, are investigated ...
A. V. Antyufeyev, A. M. Korolev, O. M. Patoka, V. M. Shulga, O. M. Ulyanov, O. M. Reznichenko, V. V. Zakharenko, V. I. Prisiazhnii, A. V. Poichalo, V. V. Voityuk, V. N. Mamarev, V. V. Ozhinskii, V. P. Vlasenko, V. M. Chmil, V. I. Lebed, M. I. Palamar, A. V. Chaikovskii, Yu. V. Pasternak, M. A. Strembitskii, M. P. Natarov, S. O. Steshenko, V. V. Glamazdyn, A. S. Shubny, A. A. Kirilenko, D. Y. Kulik, A. M. Pylypenko   +25 more
doaj   +1 more source

On the Possibility of Determining the Distance to the Galactic Center from the Geometry of Spiral Arm Segments

Open Astronomy, 2015
A new approach to determining the solar galactocentric distance, R0, from the geometry of spiral-arm segments is proposed. Geometric aspects of the problem are analyzed and a simplified three-point method for estimating R0 from objects in a spiral ...
Nikiforov I. I., Veselova A. V.
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

Detection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser Emission

The Astrophysical Journal Letters, 2023
MWC 349A is one of the rare stars known to have hydrogen radio recombination line (RRL) masers. The bright maser emission makes it possible to study the dynamics of the system at milliarcsecond (mas) precision.
Sirina Prasad, Qizhou Zhang, James Moran, Yue Cao, Izaskun Jimenéz-Serra, Jesus Martín-Pintado, Antonio Martínez-Henares, Alejandro Báez-Rubio   +7 more
doaj   +1 more source

Review of Zeeman Effect Observations of Regions of Star Formation

Frontiers in Astronomy and Space Sciences, 2019
The Zeeman effect is the only observational technique available to measure directly the strength of magnetic fields in regions of star formation. This chapter reviews the physics of the Zeeman effect and its practical use in both extended gas and in ...
Richard M. Crutcher, Athol J. Kemball
doaj   +1 more source

Determination of the Solar Galactocentric Distance from the Kinematics of Masers

Open Astronomy, 2015
We determine the parameters of Galactic rotation and the solar galactocentric distance R0 by simultaneously solving Bottlinger’s kinematic equations using data for masers with known line-of-sight velocities and highly accurate VLBI trigonometric ...
Bajkova A. T., Bobylev V. V.
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 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

5 cm OH Masers in Northern Star Formation Regions

The Astronomical Journal
We present a 6.0 GHz excited-state OH maser survey toward 155 northern star formation regions utilizing the Shanghai Tianma Radio Telescope. In total, we detect 44 6.0 GHz OH masers, 8 of which are new detections (one at 6016 MHz, two at 6030 MHz, and ...
Hai-Hua Qiao, Xu-Jia Ouyang, Zhi-Qiang Shen, Shari L. Breen, Kai Yang, Xi Chen, Juan Li   +6 more
doaj   +1 more source

Marriage, Wealth, and the Spread of Cohabitation in Canada

The British Journal of Sociology, EarlyView.
ABSTRACT Research demonstrates a robust link between marriage and wealth. Wealth facilitates marriage, which then fosters wealth accumulation, resulting in significant net worth disparities between married and cohabiting couples. Does the decline of marriage and growth of cohabitation alter this relationship?
Maude Pugliese
wiley   +1 more source