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Title:
Hopkins ultraviolet telescope observations of the far-ultraviolet spectrum of NGC 4151
Authors:
Kriss, G. A.; Davidsen, A. F.; Blair, William P.; Bowers, C. W.; Dixon, W. V.; Durrance, S. T.; Feldman, P. D.; Ferguson, H. C.; Henry, R. C.; Kimble, R. A.; Kruk, J. W.; Long, Knox S.; Moos, H. W.; Vancura, O.
Affiliation:
AA(Johns Hopkins University, Baltimore, MD), AB(Johns Hopkins University, Baltimore, MD), AC(Johns Hopkins University, Baltimore, MD), AD(Johns Hopkins University, Baltimore, MD), AE(Johns Hopkins University, Baltimore, MD), AF(Johns Hopkins University, Baltimore, MD), AG(Johns Hopkins University, Baltimore, MD), AH(Cambridge University Institute of Astronomy, England), AI(Johns Hopkins University, Baltimore, MD), AJ(NASA, Goddard Space Flight Center, Greenbelt, MD)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. 485-491. (ApJ Homepage)
Publication Date:
06/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Spectroscopy, Columbia (Orbiter), Far Ultraviolet Radiation, Seyfert Galaxies, Ultraviolet Telescopes, Active Galactic Nuclei, Emission Spectra, Iue, Lyman Alpha Radiation, Red Shift
DOI:
10.1086/171448
Bibliographic Code:
1992ApJ...392..485K

Abstract

Observations of the FUV spectrum of the Seyfert galaxy NGC 4151 from 912 to 1860 A during the flight of Astro-1 aboard the space shuttle Columbia in December 1990 are reported. Broad emission lines with full-width at half-maximum of about 8500 km/s dominate the spectrum. Numerous absorption features modify the continuum shape, particularly at wavelengths shortward of Ly-alpha. The continuum turns over sharply below 1000 A and disappears by 924 A, well above the redshifted Lyman edge of NGC 4151 at 915 A. The absorption lines have intrinsic widths of about 1000 km/s and are blueshifted relative to the system velocity of NGC 4151 by 200-1300 km/s. Absorption of the continuum by the converging higher-order Lyman lines explains the sharp turnover of the continuum below 1000 A. The blueshifts of the absorption lines, their large intrinsic widths, and the inferred high densities are all consistent with outflowing material originating in the broad-line region.

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