A Wide-area VLA Continuum Survey near the Galactic Center at 6 and 20 cm Wavelengths

Abstract

We describe the results of a mJy-sensitivity, VLA survey of roughly 1 square degree 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 HII 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 cent ral few hundred parsecs of the Galaxy.

Accepted to ApJS. Uses emulateapj style with 47 pages, 29 figures, and 13 tables

References in corpus (3)

• The ATNF Pulsar Catalogue
• GBT Multiwavelength Survey of the Galactic Center Region
• Extragalactic sources towards the central region of the Galaxy

Cited by in corpus (17)

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• A 6.7 GHz Methanol Maser Survey II. Low Galactic Latitudes
• Fourier Plane Image Combination by Feathering
• Constraining the Evolutionary Fate of Central Compact Objects: "Old" Radio Pulsars in Supernova Remnants
• ASGARD: A Large Survey for Slow Galactic Radio Transients. I. Overview and First Results
• The physical and chemical structure of Sagittarius B2 -- VI. UCHII regions in Sgr B2
• A 6.7 GHz methanol maser survey of the central molecular zone
• Populations of Magnetized Filaments in the Intracluster Medium and the Galactic Center
• Statistical Properties of the Population of the Galactic Center Filaments II: The Spacing Between Filaments
• A global view on star formation: The GLOSTAR Galactic plane survey X. Galactic HII region catalog using radio recombination lines
• The Galactic Center Lobe Filled with Thermal Plasma
• Detailed molecular observations toward the Double Helix Nebula
• G0.173-0.42: an X-ray and radio magnetized filament near the galactic center
• The SARAO MeerKAT Galactic Plane Survey filamentary source catalogue