G0. 18-0. 04 - interaction of thermal and nonthermal radio structures in the arc near the galactic center

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Astron. J.; (United States)

OSTI ID:5465197

Yusef-Zadeh, F; Morris, M

Using a high-resolution radio-continuum image made at a frequency of 4.8 GHz, the radio source G0.18-0.04 located at the intersection of the galactic center Arc with the galactic plane is discussed. In this direction, the radio Arc is composed of a set of linear, nonthermal filamentary structures superimposed on a narrow, sickle-shaped, thermal feature which crosses them. The radio image suggests a physical interaction between the thermal and nonthermal structures. It is argued that the magnetic field is dynamically important and that its strength is estimated to be very large (0.001 G). Furthermore, it is suggested that the ionization of G0.18-0.04 is caused by collisional ionization rather than ultraviolet photons from massive stars. The discussion presents possible ways in which some of the energy of the relativistc particles or the magnetic field in the nonthermal filaments might be extracted to ionize ambient gas in the galactic plane. 24 references.

• Research Organization: NASA, Goddard Space Flight Center, Greenbelt, MD; California Univ., Los Angeles
• OSTI ID: 5465197
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 94; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC GASES
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ENERGY RANGE
FLUIDS
GALAXY NUCLEI
GASES
IMAGES
IONIZATION
MAGNETIC FIELDS
MORPHOLOGY
POINT SOURCES
RADIATION SOURCES
RADIATIONS
RADIOWAVE RADIATION
RELATIVISTIC RANGE