Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...535..857s&link_type=abstract
The Astrophysical Journal, Volume 535, Issue 2, pp. 857-868.
Astronomy and Astrophysics
Astronomy
30
Ism: Clouds, Ism: Individual (Sagittarius B2), Ism: Kinematics And Dynamics, Ism: Molecules, Stars: Formation
Scientific paper
We present maps of a ~14 pc × 20 pc region covering the Sgr B2 molecular cloud complex in the 13CO (1-0) and CS (1-0) lines with high angular resolution. A more restricted central area was also mapped in the C18O (1-0) line. The 13CO cloud consists of two components: a compact core of ~3 pc in diameter roughly centered on Sgr B2(M) and an extended plateau of ~17 pc × 7.5 pc area containing the maser sources and most of the H II regions. Compact, massive (~3×105 Msolar) C18O cores are associated with Sgr B2(M) and Sgr B2(N). The obtained intensity distributions are compared with those of molecular masers and compact H II regions reported in the literature. Low-velocity (40-65 km s-1) masers, with positions roughly aligned in the north-south line connecting the three major compact H II region complexes, are located near the eastern margin of a large hole in the low-velocity molecular cloud. In contrast, most of the high-velocity (65-80 km s-1) masers are distributed near the center of a compact molecular cloud at higher velocity, where a shock seems to have occurred. These results provide further evidence supporting the cloud-cloud collision hypothesis based on limited 13CO (1-0) data. In addition, this hypothesis appears to be consistent with a wide range of new observations that have appeared in the literature.
Hasegawa Tetsuo
Miyawaki Ryosuke
Sato Fumio
Whiteoak John B.
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