A Wide-Field 90 Centimeter VLA Image of the Galactic Center Region

Details A Wide-Field 90 Centimeter VLA Image of the Galactic Center Region A Wide-Field 90 Centimeter VLA Image of the Galactic Center Region

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....119..207l&link_type=abstract

The Astronomical Journal, Volume 119, Issue 1, pp. 207-240.

Astronomy and Astrophysics

Astronomy

119

Galaxy: Center, Radio Continuum

Scientific paper

We present a wide-field, high dynamic range, high-resolution, long-wavelength (λ=90 cm) VLA image of the Galactic center region. The image is centered on Sgr A, covers an area of 4degx5deg with an angular resolution of 43", and has a rms sensitivity of ~5 mJy beam-1. The image was constructed from archival (1989 and 1991) VLA data of Pedlar et al. and Anantharamaiah et al. using new three-dimensional image restoration techniques. These three-dimensional imaging techniques resolve the problem of non-coplanar baselines encountered at long wavelengths and yield distortion-free imaging of far-field sources with improved sensitivity. At λ=90 cm the VLA is sensitive to both thermal and nonthermal emission and the resulting image gives an unprecedented contextual perspective of the large-scale radio structure in this unique and complicated region. We have catalogued over a hundred sources from this image and present for each source its 90 cm flux density, position, and size. For many of the small- diameter sources, we also derive the 20/90 cm spectral index. The spectral index as a function of length along several of the isolated nonthermal filaments has been estimated and found to be constant. We have found six new small-diameter sources, as well as several extended regions of emission, which are clearly distinct sources that have not been previously identified at higher frequencies. These data are presented as a first epoch of VLA observations that can be used to search for source variability in conjunction with a second epoch of observations that were recently initiated.

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