Observations of the Galactic Center with NICMOS, the AAT, and the VLA: Evidence for the Interaction of SGR A East and the Circumnuclear Disk

Details Observations of the Galactic Center with NICMOS, the AAT, and the VLA: Evidence for the Interaction of SGR A East and the Circumnuclear Disk Observations of the Galactic Center with NICMOS, the AAT, and the VLA: Evidence for the Interaction of SGR A East and the Circumnuclear Disk

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.8403s&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #84.03; Bulletin of the American Astronomical Society, Vol. 31, p.970

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Scientific paper

We present a synthesis of recent observations of the inner few parsecs of the Galaxy with NICMOS/HST, UNSWIRF on the AAT, and the VLA. These include H_2 and [FeII] narrow-band images, OH (1720 MHz) maser observations, and radio continuum measurements. These observations suggest that the outer edge of the Circumnuclear Disk (CND) is collisionally excited whereas the inner edge is likely to be heated predominantly by the IRS 16 cluster. Subarcsecond resolution images in H_2 reveal new linear features: one outlining the outer, northwestern edge of the CND and another appearing to extend from beyond the CND towards a highly disturbed region where the Northern Arm intersects the CND. Highly extincted regions are also imaged near the inner edge of the CND. The kinematic and spatial correlation of H_2 and OH (1720 MHz) as well as the spatial distribution of radio continuum emission at 90cm suggest that Sgr A East is interacting with and shocking the CND.

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