Sgr B2(N): A bipolar outflow and rotating hot core revealed by ALMA
作者： Kazuya Saigo , Patricio Sanhueza , Aya E. Higuchi , Tetsuo Hasegawa , James O. Chibueze
DOI: 10.1088/0004-637X/815/2/106
关键词:
摘要: We present the results of SiO (2-1) and SO2 (12-13) line observations Sgr B2(N) made with Atacama Large Millimeter/submillimeter Array (ALMA) at an angular resolution ~2arcsec. Our analysis emission reveals a bipolar molecular outflow in east-west direction whose driving source is located K2. In addition, core shows north-south velocity gradient most probably indicating hot gas rotating around Fractional abundances (X(SO2) X(SiO), respectively) outflowing are derived from comparisons C18O emission. Assuming excitation temperature 100+-50 K, we calculate X(SO2) = 2.3X10^-8 X(SiO) 1.2X10^-9. The SgrB2(N) K2 characterized as young (5X10^3yr) massive (~2000Msun), but moderately collimated (~60deg) outflow. also report possible detection (v=2, J=2-1) maser position If confirmed, it would make 4th star forming region associated masers.
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sci-hub.st 参考文章(88)
C. G. de Pree, R. A. Gaume, W. M. Goss, M. J. Claussen, The Sagittarius B2 Star-forming Region. III. High-Resolution H52 alpha and H66 alpha Observations of Sagittarius B2 Main The Astrophysical Journal. ,vol. 464, pp. 788- ,(1996) , 10.1086/177364
R. Genzel, D. Downes, J. Bieging, H2O Masers Associated with Compact H II Regions in SGR B2 Monthly Notices of the Royal Astronomical Society. ,vol. 177, ,(1976) , 10.1093/MNRAS/177.1.101P
David M. Mehringer, Karl M. Menten, 44 GHz Methanol Masers and Quasi-Thermal Emission in Sagittarius B2 The Astrophysical Journal. ,vol. 474, pp. 346- 361 ,(1997) , 10.1086/303454
Paul F. Goldsmith, Ronald L. Snell, T. Hasegawa, N. Ukita, Small-scale structure and chemical differentiation in the central region of the Sagittarius B2 molecular cloud The Astrophysical Journal. ,vol. 314, pp. 525- ,(1987) , 10.1086/165083
S. B. Charnley, SULFURETTED MOLECULES IN HOT CORES The Astrophysical Journal. ,vol. 481, pp. 396- 405 ,(1997) , 10.1086/304011
Aya E. Higuchi, Shigehisa Takakuwa, James O. Chibueze, Kazuya Saigo, Patricio Sanhueza, Guido Garay, IRAS16547-4247: A New Candidate of a Protocluster Unveiled with ALMA arXiv: Astrophysics of Galaxies. ,(2014) , 10.1088/2041-8205/798/2/L33
H. Beuther, K. M. Menten, P. Schilke, C. M. Walmsley, T. K. Sridharan, F. Wyrwoski, Massive molecular outflows arXiv: Astrophysics. ,(2001) , 10.1051/0004-6361:20011808
Riccardo Cesaroni, Daniele Galli, Giuseppe Lodato, Malcolm Walmsley, Qizhou Zhang, The critical role of disks in the formation of high-mass stars. Nature. ,vol. 444, pp. 703- 706 ,(2006) , 10.1038/NATURE05344
D. C. Lis, P. F. Goldsmith, J. E. Carlstrom, N. Z. Scoville, Millimeter-wavelength aperture synthesis observations of massive star-forming regions in Sagittarius B2 The Astrophysical Journal. ,vol. 402, pp. 238- 248 ,(1993) , 10.1086/172127
M. T. Beltrán, Á. Sánchez-Monge, R. Cesaroni, M. S. N. Kumar, D. Galli, C. M. Walmsley, S. Etoka, R. S. Furuya, L. Moscadelli, T. Stanke, F. F. S. van der Tak, S. Vig, K.-S. Wang, H. Zinnecker, D. Elia, E. Schisano, Filamentary structure and Keplerian rotation in the high-mass star-forming region G35.03+0.35 imaged with ALMA Astronomy and Astrophysics. ,vol. 571, ,(2014) , 10.1051/0004-6361/201424031