The small-scale distribution of emission from the 6.7-GHz transition of methanol in SGR B2

Details The small-scale distribution of emission from the 6.7-GHz transition of methanol in SGR B2 The small-scale distribution of emission from the 6.7-GHz transition of methanol in SGR B2

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273.1033h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 4, pp. 1033-1040.

Astronomy and Astrophysics

Astronomy

21

Masers, Stars: Formation, Ism: Individual: Sgr B2, Ism: Kinematics And Dynamics, Ism: Molecules, Radio Lines: Ism

Scientific paper

The Australia Telescope Compact Array has been used to map the distribution of emission from the 6.7-GHz 5_1-6_0A^+ transition of methanol over the HII region/molecular cloud complex Sgr B2. Images obtained with restored beamwidths of 3 arcsec and lower reveal the presence of 11 methanol maser locations, seven of which are near maser positions for other molecules. Methanol absorption has been detected in two well-known clouds, with velocities near 65 and 80 km s^-1, which observations of other molecules have shown to be associated with Sgr B2. Although other transitions, including the 2_0-_-1E transition of methanol at 12.2 GHz, have shown that the 65 km s^-1 cloud extends over all the continuum emission, the 6.7-GHz absorption is confined to the north and west, with optical depths of around unity. No absorption was found to be associated with a third known cloud with a velocity near 50 km s^-1. We suggest that 6.7-GHz absorption occurs only in the regions of higher temperature in the molecular clouds. Assumed cloud temperatures of 20 K yield methanol column densities as high as 7.5x10^18 cm^-2.

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