Aperture Synthesis Imaging of a High-Velocity Compact Cloud near the Galactic Center

Details Aperture Synthesis Imaging of a High-Velocity Compact Cloud near the Galactic Center Aperture Synthesis Imaging of a High-Velocity Compact Cloud near the Galactic Center

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60..429o&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.60, No.3, pp.429--434

Astronomy and Astrophysics

Astronomy

4

Galaxies: Nuclei, Galaxy: Center, Ism: Clouds, Ism: Molecules

Scientific paper

We observed CO J = 1-0 and HCN J = 1-0 line emission toward a high-velocity, compact molecular cloud, CO0.02-0.02, near the center of our Galaxy, using the Nobeyama Millimeter Array (NMA). A CO velocity-integrated map with a resolution of 4.''3×2.''4 shows two oval clumps with sizes of 0.8pc. These clumps are seperated by 1.2pc, being located at the eastern and southwestern peripheries of the CO0.02-0.02 cloud. The overall distribution of HCN emission coincides with that taken with the Nobeyama 45m telescope. The HCN velocity-integrated map with a resolution of 6.''1×3.''4 shows two prominent peaks in the cloud center. Both NMA maps at VLSR˜110kms-1 show an arc-shaped edge in the southeast, which may correspond to the edge of the "emission cavity" found in the CO J = 3-2 integrated-intesity map. We also noticed a faint radio continuum "arc" that encircles the bulk of the CO0.02-0.02 cloud. These results support the notion that CO0.02-0.02 has been accelerated, heated, and compressed in a series of supernova shocks that occurred within the last (3-5)×104yr. We suggest that a massive compact cluster with an age of 10-30Myr is responsible for the formation of the CO 0.02-0.02 cloud.

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