The northern extension of the radio arc near the Galactic center

Details The northern extension of the radio arc near the Galactic center The northern extension of the radio arc near the Galactic center

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..729y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 729-738.

Astronomy and Astrophysics

Astronomy

38

Galactic Nuclei, Milky Way Galaxy, Radio Sources (Astronomy), Very Large Array (Vla), High Resolution, Low Frequencies, Nonthermal Radiation, Polarization (Waves), Radio Telescopes, Thermal Radiation

Scientific paper

High-resolution observations of the positive-latitude extension of the radio continuum arc at 1 = 0.2 deg, the northern polarized lobe, have been carried out at both 6 and 20 cm wavelengths. These observations show clearly that the northern lobe is composed of a number of filaments which join continuously with the more prominent, linear, filamentary structures constituting the radio continuum arc, thus confirming the suggestion based on single-dish observations that the polarized lobe and the arc are physically associated. Attention is drawn to a puzzling absorption filament adjacent to the nonthermal filaments in the 6 cm images, implying the existence of a thermal component associated with the system of nonthermal filaments. These observations help clarify the spatial relationship between the thermal and nonthermal structures constituting the continuum arc, provide pictorial evidence that the nonthermal and thermal features are interacting, and support the hypothesis that the geometry of the magnetic field is poloidal near the Galactic center. The images are used to argue against the suggestion that the lobe is a manifestation activity associated with the Galactic nucleus.

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