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FOLLOW-UP OBSERVATIONS TOWARD PLANCK COLD CLUMPS WITH GROUND-BASED RADIO TELESCOPES
LIU, TIE,WU, YUEFANG,MARDONES, DIEGO,KIM, KEE-TAE,MENTEN, KARL M.,TATEMATSU, KEN,CUNNINGHAM, MARIA,JUVELA, MIKA,ZHANG, QIZHOU,GOLDSMITH, PAUL F,LIU, SHENG-YUAN,ZHANG, HUA-WEI,MENG, FANYI,LI, DI,LO, NA The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
The physical and chemical properties of prestellar cores, especially massive ones, are still far from being well understood due to the lack of a large sample. The low dust temperature (< 14 K) of Planck cold clumps makes them promising candidates for prestellar objects or for sources at the very initial stages of protostellar collapse. We have been conducting a series of observations toward Planck cold clumps (PCCs) with ground-based radio telescopes. In general, when compared with other star forming samples (e.g. infrared dark clouds), PCCs are more quiescent, suggesting that most of them may be in the earliest phase of star formation. However, some PCCs are associated with protostars and molecular outflows, indicating that not all PCCs are in a prestellar phase. We have identified hundreds of starless dense clumps from a mapping survey with the Purple Mountain Observatory (PMO) 13.7-m telescope. Follow-up observations suggest that these dense clumps are ideal targets to search for prestellar objects.
TRIGONOMETRIC PARALLAXES OF STAR FORMING REGIONS IN THE PERSEUS SPIRAL ARM
Choi, Y. K.,Hachisuka, K.,Reid, M. J.,Xu, Y.,Brunthaler, A.,Menten, K. M.,Dame, T. M. IOP Publishing 2014 The Astrophysical journal Vol.790 No.2
<P>We report trigonometric parallaxes and proper motions of water masers for 12 massive star forming regions in the Perseus spiral arm of the Milky Way as part of the Bar and Spiral Structure Legacy (BeSSel) Survey. Combining our results with 14 parallax measurements in the literature, we estimate a pitch angle of 9 degrees.9 +/- 1 degrees.5 for a section of the Perseus arm. The three-dimensional Galactic peculiar motions of these sources indicate that on average they are moving toward the Galactic center and slower than the Galactic rotation.</P>
First 230 GHz VLBI fringes on 3C 279 using the APEX Telescope
Wagner, J.,Roy, A. L.,Krichbaum, T. P.,Alef, W.,Bansod, A.,Bertarini, A.,Gü,sten, R.,Graham, D.,Hodgson, J.,Mä,rtens, R.,Menten, K.,Muders, D.,Rottmann, H.,Tuccari, G.,Weiss, A.,Wieching, G.,W EDP Sciences 2015 Astronomy and astrophysics Vol.581 No.-