Echelle spectrometry of the Seyfert galaxies NGC 3783 and Markarian 509

Abstract

view Abstract Citations (74) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Echelle spectrometry of the Seyfert galaxies NGC 3783 and Markarian 509. Atwood, B. ; Baldwin, J. A. ; Carswell, R. F. Abstract Echelle spectrometry of two Seyfert galaxies, NGC 3783 and Markarian 509, is used to investigate the narrow and broad emission-line profiles. In NGC 3783 it is found that while the narrow emission lines have smooth profiles, they must be the summation of a number of components having different electron densities and/or temperatures. In Markarian 509 the forbidden S II and N II line profiles are similar to those of forbidden O III, suggesting that the physical conditions as a function of velocity are more homogeneous than for NGC 3783. The broad H-alpha and H-beta lines in both galaxies have approximately identical profiles. For Mrk 509, a cross-correlation of the two profiles indicates that the number of optically thin unresolved clouds needed to make up the emission line region is greater than about 50,000. Publication: The Astrophysical Journal Pub Date: June 1982 DOI: 10.1086/160011 Bibcode: 1982ApJ...257..559A Keywords: Emission Spectra; Galactic Nuclei; Seyfert Galaxies; Spectral Line Width; Spectrophotometry; Continuous Spectra; Electron Density (Concentration); Electron Energy; Forbidden Bands; H Lines; High Resolution; Molecular Clouds; Spectrum Analysis; Astronomy full text sources ADS | data products NED (3) SIMBAD (2)