Northern extension of the radio arc near the Galactic center

Journal Article · Wed Jun 01 04:00:00 EDT 1988 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/166417· OSTI ID:7067388

Yusef-zadeh, F; Morris, M

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. 30 references.

• Research Organization: NASA, Goddard Space Flight Center, Greenbelt, MD (USA); California Univ., Los Angeles (USA)
• OSTI ID: 7067388
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 329; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTENNAS
COSMIC RADIO SOURCES
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
GALAXIES
GALAXY NUCLEI
INTERSTELLAR MAGNETIC FIELDS
MAGNETIC FIELDS
MILKY WAY
MORPHOLOGY
POLARIZATION
RADIATIONS
RADIO EQUIPMENT
RADIO TELESCOPES
RADIOWAVE RADIATION
TELESCOPES
THERMAL RADIATION