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Title:
A multiwavelength study of the Seyfert 1 galaxy MCG-6-30-15
Authors:
Reynolds, C. S.; Ward, M. J.; Fabian, A. C.; Celotti, A.
Affiliation:
AA(Colorado, Univ., Boulder), AB(Leicester, Univ.), AC(Cambridge, Univ.), AD(SISSA)
Publication:
Royal Astronomical Society, Monthly Notices, vol. 2911, p. 403 (MNRAS Homepage)
Publication Date:
11/1997
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
SEYFERT GALAXIES, ROSAT MISSION, X RAY SPECTRA, ACTIVE GALACTIC NUCLEI, VISIBLE SPECTRUM, PHOTOIONIZATION, ULTRAVIOLET ASTRONOMY, LINE SPECTRA
Bibliographic Code:
1997MNRAS.291..403R

Abstract

We present a multiwaveband spectroscopic study of the nearby Seyfert 1 galaxy MCG-6-30-15. New optical spectra from the Anglo-Australian Telescope are presented which clearly show the effects of dust extinction/reddening on both the emission-line spectrum and the nonstellar AGN continuum. The reddening is constrained to be in the range E(B-V) = 0.61-1.09. Spectroscopy in the X-ray band, with both ROSAT and ASCA, reveals absorption by the warm absorber but little or no neutral absorption expected to accompany the dust responsible for the optical reddening. The dusty warm absorber solution to this discrepancy is discussed, and photoionization models of such warm absorbers are constructed. The optical spectrum also displays the relatively strong 'coronal' lines of forbidden Fe X 6375 A, forbidden Fe XI 3.7892 A, and forbidden Fe XIV 45303 A. We show that these lines may plausibly originate from the outer regions of the warm absorber, although better calculations of the collision strengths for these transitions are required in order to address this issue conclusively. We also present new ultraviolet data from the IUE and suggest that much of the observed UV flux is scattered into our line of sight. We conclude with a discussion of the global energetics of this system.

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