Discrete Radio Sources in the Spiral Galaxy NGC 6946

Details Discrete Radio Sources in the Spiral Galaxy NGC 6946 Discrete Radio Sources in the Spiral Galaxy NGC 6946

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....119.1711h&link_type=abstract

The Astronomical Journal, Volume 119, Issue 4, pp. 1711-1719.

Astronomy and Astrophysics

Astronomy

13

Ism: Dust, Extinction, Galaxies: Individual (Ngc 6946), Ism: H Ii Regions, Radio Continuum, Ism: Supernova Remnants

Scientific paper

We analyze the 2"-resolution, high-sensitivity radio continuum observations of the nearby spiral galaxy NGC 6946 at 6 and 20 cm by Lacey, Duric, & Goss to derive a luminosity function at each wavelength for 43 H II region candidates and for 15 supernova remnant (SNR) candidates. The H II region radio luminosity functions are best fitted by power laws consistent with the shape of the optical luminosity function of Bonnarel, Boulsteix, & Marcelin. The SNR luminosity functions are fitted by considerably steeper power laws than the H II region luminosity functions. Extinctions to the H II regions are estimated from a comparison of radio flux densities with new optical fluxes derived from the Hα observations of Van Dyk. A dependence of extinction on galactocentric radius is investigated, but none is found.

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