A halo and a blow-out in NGC 253

Details A halo and a blow-out in NGC 253 A halo and a blow-out in NGC 253

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..334c&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 334-335 (SEE N93-26706 10-90)

Physics

Barred Galaxies, Cosmic Dust, Emission Spectra, Galactic Halos, Radio Emission, Synchrotrons, Galactic Nuclei, Magnetic Fields, Very Large Array (Vla)

Scientific paper

We present the discovery of a 'synchrotron halo' in NGC 253. NGC 253 is an inclined, dusty, barred Sc galaxy in the Sculptor Group. It is also one of the prototype nuclear star burst galaxies. Very Large Array observations at 327 MHz and 1.4 GHz have revealed a synchrotron emitting 'halo' extending 9 kpc above and below the plane of NGC 253 (assuming a distance of 4 Mpc). The spectral index for the radio emission steepens from -0.7 in the disk to -1.0 in the halo. The fractional polarization at 1.4 GHz increases from less than or equal to 2 percent in the disk up to 20 percent in the halo, and the magnetic field vectors project parallel to the plane over most of the halo.

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