A WIDE-AREA VLA CONTINUUM SURVEY NEAR THE GALACTIC CENTER AT 6 AND 20 cm WAVELENGTHS

作者：Law C J^*; Yusef Zadeh F; Cotton W D

来源：Astrophysical Journal, The - Supplement Series, 2008, 177(2): 515-545.

DOI：10.1086/588218

• Galaxy: center
• radio continuum: general
• surveys

We describe the results of a millijansky sensitivity VLA survey of roughly 1 deg(2) near the Galactic center at 6 and 20 cm. Catalogs of compact and filamentary structures are given and compared to previous surveys of the region. Eight of the unusual nonthermal radio filaments are detected in 6 cm polarized emission; three of these are the first such detections, confirming their nonthermal nature. This survey found emission from a filament at (l, b) = (359.1, 0.75), or a projected distance from Sgr A* of 200 pc, greatly extending the latitude range observed with such features. There is also new evidence for spatial gradients in the 6/20 cm spectral indices of some filaments, and we discuss models for these gradients. In studying compact sources, the combination of spectral index and polarization information allows us to identify pulsar candidates and compact H II regions in the survey. There is also some evidence that the flux measurements of compact sources may be affected by electron scattering from the interstellar medium in the central few hundred parsecs of the Galaxy.

• 出版日期2008-8
• 单位西北大学