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- W1972678003 abstract "view Abstract Citations (103) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Variability of Markarian 1018: Seyfert 1.9 to Seyfert 1 Cohen, Ross D. ; Rudy, Richard J. ; Puetter, R. C. ; Ake, T. B. ; Foltz, Craig B. Abstract Simultaneous IUE and optical spectrophotometry of the Seyfert 1.9 galaxy Markarian 1018 is presented. The strength of H-beta(broad) has increased by a factor of 6.6 in 4 yr, and the galaxy now shows strong broad UV and optical line emission similar to that seen in normal Seyfert 1 galaxies, but with markedly asymmetric line profiles. As in other variable Seyfert galaxies, H-alpha emission has also increased but by a lesser amount than H-beta. Furthermore, Ly-alpha (not observed during the first epoch) is now quite strong relative to H-beta and H-alpha. Inspection of the line profiles reveals nearly identical blue asymmetric line profiles in all permitted lines; these show evidence of significant profile evolution over a 1 yr time scale. The present line ratios and the nature of their variability suggest that the enhancement in the broad-line emission is not caused by the removal of obscuring dust but by the 'lighting up' of the broad-line region. Publication: The Astrophysical Journal Pub Date: December 1986 DOI: 10.1086/164758 Bibcode: 1986ApJ...311..135C Keywords: Seyfert Galaxies; Spectrophotometry; Ultraviolet Astronomy; Computational Astrophysics; H Alpha Line; H Beta Line; Iue; Line Spectra; Ultraviolet Spectra; Astrophysics; GALAXIES: INDIVIDUAL NAME: MARKARIAN 1018; GALAXIES: SEYFERT; SPECTROPHOTOMETRY; ULTRAVIOLET: SPECTRA full text sources ADS | data products SIMBAD (6) NED (6) MAST (1) INES (1)" @default.
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- W1972678003 date "1986-12-01" @default.
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- W1972678003 title "Variability of Markarian 1018 - Seyfert 1.9 to Seyfert 1" @default.
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