On the possible importance of Markarian 359

Abstract

view Abstract Citations (35) References (7) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the possible importance of Markarian 359. Davidson, K. ; Kinman, T. D. Abstract Results are presented for three-color photometry and observations with an intensified image dissector-scanner of the central regions of Markarian 359, a face-on galaxy with a compact nucleus that contains dense permitted-line gas in which the apparent velocity dispersion is only a few hundred kilometers/sec. UBV photometric data are reported for six circular regions centered on the galactic nucleus, and the emission-line intensities in the wavelength range from 3400 to 6800 A are examined. It is found that the line intensities are like those which would result if the broad permitted lines were largely removed from the spectrum of a Seyfert nucleus of class 1 and that the H-beta line is broader than the forbidden O III line but not nearly as wide as the broad permitted component in a typical Seyfert 1 spectrum. The differences in line width are explained in terms of a gas component which is too dense to emit much forbidden-line radiation and which has a larger velocity dispersion than the lower-density gas where the forbidden lines originate. Further observations of this unusual galaxy are recommended. Publication: The Astrophysical Journal Pub Date: November 1978 DOI: 10.1086/156541 Bibcode: 1978ApJ...225..776D Keywords: Astronomical Photometry; Emission Spectra; Galaxies; Seyfert Galaxies; Spectral Line Width; Forbidden Bands; Galactic Nuclei; Ubv Spectra; Astrophysics; Galactic Nuclei:Spectra; Seyfert Galaxies: Nuclei full text sources ADS | data products NED (2)