A wide-area VLA continuum survey near the Galactic center at 6 and 20 CM wavelengths

C. J. Law, F. Yusef-Zadeh, W. D. Cotton

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

We describe the results of a millijansky sensitivity VLA survey of roughly 1 deg2 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 cmpolarized 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 fluxmeasurements of compact sources may be affected by electron scattering from the interstellar medium in the central few hundred parsecs of the Galaxy.

Original languageEnglish (US)
Pages (from-to)515-545
Number of pages31
JournalAstrophysical Journal, Supplement Series
Volume177
Issue number2
DOIs
StatePublished - Aug 1 2008

Keywords

  • Galaxy: center
  • Radio continuum: general
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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