Optical spectroscopy of the radio-loud nuclei of spiral galaxies - Starbursts or monsters?

Details Optical spectroscopy of the radio-loud nuclei of spiral galaxies - Starbursts or monsters? Optical spectroscopy of the radio-loud nuclei of spiral galaxies - Starbursts or monsters?

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1077h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 88, Aug. 1983, p. 1077-1087. Research supported by the University of Maryland.

Astronomy and Astrophysics

Astronomy

77

Astronomical Spectroscopy, Galactic Nuclei, Radio Sources (Astronomy), Spiral Galaxies, Bursts, Galactic Structure, H Ii Regions, Infrared Astronomy, Nonthermal Radiation, Optical Emission Spectroscopy, Starburst Galaxies, Supernova Remnants

Scientific paper

Optical spectroscopic data pertaining to the physical state, kinematics and spatial extent of emission line gas near the radio-loud nuclei of spiral galaxies are combined with published optical, radio and IR data, in an examination of the Condon et al (1982) suggestion that the nuclear radio emission in galaxies of this class is produced by multiple SNRs generated by a nuclear starburst. It is found that only about 1/3 of the spiral galaxies examined have optical spectroscopic properties consistent with those of 'extranuclear starbursts'. Evidence is adduced for the view that the putative nuclear starbursts must differ significantly from extranuclear starbursts. While giant H II regions generally have thermal radio emission, the radio-loud nuclei exhibit nonthermal radio emission whose spectrum is much steeper than that of SNRs.

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