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    Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

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    Kriss_2019_ApJ_881_153.pdf
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    Description:
    Final Published Version
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    Author
    Grier, C. J. cc
    Vestergaard, M.
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2019-08-22
    Keywords
    galaxies: active; galaxies: individual (NGC 5548)
    galaxies: nuclei
    galaxies: Seyfert
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    G. A. Kriss et al 2019 ApJ 881 153
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    Copyright © 2019. The American Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We model the ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 obtained with the Hubble Space Telescope during the 6 month reverberation mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblends the individual emission lines. Using the modeled spectra, we measure the response to continuum variations for the deblended and absorption-corrected individual broad emission lines, the velocity-dependent profiles of Lyα and C iv, and the narrow and broad intrinsic absorption features. We find that the time lags for the corrected emission lines are comparable to those for the original data. The velocity-binned lag profiles of Lyα and C iv have a double-peaked structure indicative of a truncated Keplerian disk. The narrow absorption lines show a delayed response to continuum variations corresponding to recombination in gas with a density of ~105 cm−3. The high-ionization narrow absorption lines decorrelate from continuum variations during the same period as the broad emission lines. Analyzing the response of these absorption lines during this period shows that the ionizing flux is diminished in strength relative to the far-ultraviolet continuum. The broad absorption lines associated with the X-ray obscurer decrease in strength during this same time interval. The appearance of X-ray obscuration in ~2012 corresponds with an increase in the luminosity of NGC 5548 following an extended low state. We suggest that the obscurer is a disk wind triggered by the brightening of NGC 5548 following the decrease in size of the broad-line region during the preceding low-luminosity state.
    Note
    Open access article
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/ab3049
    Version
    Final published version
    Sponsors
    NASA; Space Telescope Science Institute; National Science Foundation (NSF); NSF [AST-1412315]; Padua University [AST-1412693]; NSF CAREER grant [DOR1699945/16, DOR1715817/17, DOR1885254/18, BIRD164402/16]; NASA through Chandra award [AST-1253702]; HHMI [AR7-18013X, NAS8-03060, HST-AR-13240.009]; NSF Fellowship [AST-1302093]; ADAP [NNX13AC26G, NNX13AC63G, NNX13AE99G]; STScI [ATP 17-0141]; Huffaker scholarship [HST-AR-13914, HST-AR-15018]; Polish National Science Center grant Polonez [2016/21/P/ST9/04025]; NSERC [NNH13CH61C]; UK Science and Technology Facilities Council [ST/J001651/1]; National Research Foundation of Korea (NRF); National Research Foundation of Korea (NRF) - Korean government (MSIT) [2017R1A3A3001362]; NWO, the Netherlands Organization for Scientific Research [AST-0618209]; UC Center for Galaxy Evolution; Fondecyt [AST-1009571, AST-1210311]; NSF graduate fellowship [1120328]; UCSB Dean's Fellowship; NOVA; Nederlandse Onderzoekschool voor Astronomie; CNPq; National Council for Scientific and Technological Development (Brazil); Packard Foundation in the form of a Packard Research Fellowship; TABASGO Foundation; Christopher R. Redlich Fund; Miller Institute for Basic Research in Science (UC Berkeley); Danish Council for Independent Research [DFF 4002-00275]; National Research Foundation of Korea (NRF) - Korean government; National Aeronautics and Space Administration [2010-0027910]
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab3049
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