Wide Field Radio Imaging of the Galactic Center

Details Wide Field Radio Imaging of the Galactic Center Wide Field Radio Imaging of the Galactic Center

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aspc..186..403k&link_type=abstract

The Central Parsecs of the Galaxy, ASP Conference Series, Vol. 186. Edited by Heino Falcke, Angela Cotera, Wolfgang J. Duschl, F

Astronomy and Astrophysics

Astronomy

8

Scientific paper

We present a large and sensitive sub-arcminute resolution meter wavelength image of the Galactic Center. Archival 330 MHz (λ0.9 m) VLA observations were reprocessed utilizing wide-field imaging [index wide-field imaging] algorithms developed at the National Radio Astronomy Laboratory and the Naval Research Laboratory. The resulting image is a significant improvement over previous ones, both providing higher fidelity images of known sources and revealing many new sources. We have also used ``targeted faceting'' to generate images at the full resolution of the data for the first time for regions well away from Sgr A [index Source ! Sgr A]. At 330 MHz the VLA is sensitive to both thermal and non-thermal sources, and this image provides an excellent overview of the large-scale structure (2° times 2°) in the Galactic Center. Several new sources have been found, and a catalogue of over 100 sources is being prepared. Subsequent observations of one of these new features has led to the discovery of a new non-thermal filament with a unique orientation along the plane; observations of other new features are in progress. Improved imaging and sensitivity has allowed for better spectral index determinations. In particular, the spectral index (between 330 and 1400 MHz) as a function of length along several non-thermal filaments has been measured. The spectral index was found to be constant, indicating that these may be young features. A second epoch 330 MHz Galactic Center imaging campaign, an efficient monitor for source variability and transients [index transients], is in progress as is a first epoch campaign with the new 74 MHz VLA observing system.

Affiliated with

Also associated with

No associations

Rating

Wide Field Radio Imaging of the Galactic Center does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Wide Field Radio Imaging of the Galactic Center, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wide Field Radio Imaging of the Galactic Center will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1498113