The amorphous galaxy NGC 3448. II - Continuum radio emission, and the discovery of a population of starburst-associated radio sources

Details The amorphous galaxy NGC 3448. II - Continuum radio emission, and the discovery of a population of starburst-associated radio sources The amorphous galaxy NGC 3448. II - Continuum radio emission, and the discovery of a population of starburst-associated radio sources

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1045n&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, May 1987, p. 1045-1053. NSERC-supported research.

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23

Extragalactic Radio Sources, Galactic Evolution, Galactic Structure, Spectrum Analysis, Starburst Galaxies, Astronomical Maps, Astronomical Models, Far Infrared Radiation, Galactic Nuclei

Scientific paper

The amorphous galaxy NGC 3448 of the Arp 205 system was observed at low and high resolution at the VLA at λλ 22, 18, 6, and 2 cm continuum. High-resolution images at 6 cm resolve the nuclear region into a family of radio sources falling along the conspicuous dust lane of NGC 3448. These unresolved point sources are reminiscent of those found in M82, and are probably individual or unresolved complexes of SN/SNR. No continuum emission is seen in its companion UGC 6016. This low-resolution maps of NGC 3448 are dominated by signal from the center of the galaxy. No polarized emission was detected, giving an upper limit of 6 μG on the magnetic field strength in the tidal appendages. The diffuse emission from the "body" of NGC 3448 appears to have a thermal origin. The far-infrared luminosity of NGC 3448 compares with that of M82. Its FIR-to-6-cm intensity ratio is typical of other starburst galaxies. The authors suggest that NGC 3448 is experiencing a starburst characterized by a supernova rate of one about every ˜10 yr. NGC 3448 appears to be a good analog of M82.

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