Radio continuum observations of the edge-on spiral galaxy NGC 4666

Details Radio continuum observations of the edge-on spiral galaxy NGC 4666 Radio continuum observations of the edge-on spiral galaxy NGC 4666

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231..765s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, April 1, 1988, p. 765-772.

Astronomy and Astrophysics

Astronomy

10

Radio Astronomy, Radio Observation, Radio Spectra, Relativistic Electron Beams, Spiral Galaxies, Very Large Array (Vla), Flux Density, High Resolution, Radio Emission, Radio Telescopes

Scientific paper

Radio continuum emission from the edge-on spiral galaxy NGC 4666 has been studied using high-resolution observations at 327 MHz with the Ooty Synthesis Radio Telescope and at 1465 and 4885 MHz with the VLA. Radio emission has been detected from the disk of the galaxy as well as from the halo up to a distance of about 7 kpc from the galactic plane. The radio spectral index between 327 and 1465 MHz remains almost constant (alpha = 0.60) with height to a distance of about 5 kpc above the plane of the galaxy. Beyond this distance, the spectrum steepens rapidly. The galaxy has also been observed at 4750 MHz with the Effelsberg 100-m telescope and the spectrum of the integrated flux density is derived. The total intensity spectrum and the variation of the radio spectral index between 327 and 1465 MHz are examined in the context of simple propagation models for the relativistic electrons which diffuse and/or convect from the galactic disk into the halo. The recent theoretical studies of transport mechanisms utilizing extended source functions, variable diffusion coefficient and convection (dynamical halo) are discussed. The present results are broadly consistent with all these models.

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