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Date and Time of the Query: 2019-06-25 T14:47:09 PDT
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For refcode 2000AJ....119.1711H:
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Copyright by American Astronomical Society. Reproduced by permission
2000AJ....119.1711H DISCRETE RADIO SOURCES IN THE SPIRAL GALAXY NGC 6946 SCOTT D. HYMAN Department of Physics, Sweet Briar College, Sweet Briar, VA 24595; hyman@sbc.edu CHRISTINA K. LACEY AND KURT W. WEILER Remote Sensing Division, Naval Research Laboratory, Code 7213, Washington, DC 20375-5320; lacey@rsd.nrl.navy.mil, weiler@rsd.nrl.navy.mil AND SCHUYLER D. VAN DYK Infrared Processing and Analysis Center, California Institute of Technology, Mail Stop 100-22, Pasadena, CA 91129; vandyk@ipac.caltech.edu Received 1999 October 10; accepted 2000 January 4 ABSTRACT 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 H{alpha} observations of Van Dyk. A dependence of extinction on galactocentric radius is investigated, but none is found. Key words: dust, extinction-galaxies: individual (NGC 6946) -H II regions- radio continuum-supernova remnants
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