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13 papers · 2 filters
Parallaxes for W49N and G048.60+0.02: Distant Star Forming Regions in the Perseus Spiral Arm
B. Zhang, M. J. Reid, K. M. Menten +4
We report trigonometric parallax measurements of 22 GHz HO masers in two massive star-forming regions from VLBA observations as part of the BeSSeL Survey. The distances of $11.…
The Parallax of W43: a Massive Star Forming Complex near the Galactic Bar
B. Zhang, L. Moscadelli, M. Sato +7
We report trigonometric parallax measurements of masers in the massive star forming complex W43 from VLBA observations as part of the BeSSeL Survey. Based on measurements of three…
Short-Term Radio Variability and Parsec-Scale Structure in a Gamma-Ray Narrow-Line Seyfert 1 Galaxy 1H 0323+342
Kiyoaki Wajima, Kenta Fujisawa, Masaaki Hayashida +3
We made simultaneous single-dish and very long baseline interferometer (VLBI) observations of a narrow-line Seyfert 1 galaxy (NLS1) 1H 0323+342, showing gamma-ray activity revealed…
A Schwarzschild model of the Galactic bar with initial density from N-body simulations
Yougang Wang, Shude Mao, Richard J. Long +1
Using the potential from N-body simulations, we construct the Galactic bar models with the Schwarzschild method. By varying the pattern speed and the position angle of the bar, we…
A spectroscopic and proper motion search of Sloan digital Sky Survey: red subdwarfs in binary systems
Z. H. Zhang, D. J. Pinfield, B. Burningham +13
Red subdwarfs in binary systems are crucial for both model calibration and spectral classification. We search for red subdwarfs in binary systems from a sample of high proper motio…
Internal Motion of 6.7-GHz Methanol Masers in H II Region S269
Satoko Sawada-Satoh, Kenta Fujisawa, Koichiro Sugiyama +2
We present the first internal motion measurement of the 6.7-GHz methanol maser within S269, a small HII region in the outer Galaxy, which was carried out in 2006 and 2011 using the…