Journal ArticleDOI
Direct evidence of non-disk optical continuum emission around an active black hole
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TLDR
In this article, the authors report new reverberation data based on a unique narrowband-imaging design, and argue that time delays between adjacent optical bands are primarily associated with the reprocessing of light by a farther away under-appreciated non-disk component.Abstract:
Accretion onto black holes is key to their growth over cosmic time1, especially during the active galactic nuclei phase when the inflowing material forms a radiatively efficient accretion disk2. To probe the disk, indirect imaging methods such as reverberation mapping3–6 and microlensing7,8 are required. Recent findings suggest that the disk may be larger than theoretical predictions by a factor of a few4,6,9, thus casting doubt on our understanding of accretion in the general astrophysical context. Whether new physics is implied10–12 or poorly understood biases are in effect5,6,13,14 is a longstanding question. Here, we report new reverberation data based on a unique narrowband-imaging design15, and argue that time delays between adjacent optical bands are primarily associated with the reprocessing of light by a farther away under-appreciated non-disk component. This component is associated with high-density photoionized material that is uplifted from the outer accretion disk, probably by radiation-pressure force on dust, and thus may represent the long-sought origin of the broad-line region16. Our findings suggest that the optical phenomenology of some active galactic nuclei may be substantially affected by non-disk continuum emission with implications for measuring the fundamental properties of black holes and their active environs over cosmic time. New variability data of the accretion disk in active galactic nuclei argue for the existence of a farther away under-appreciated non-disk component associated with high-density photoionized material that is uplifted from the outer accretion disk.read more
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Journal ArticleDOI
Quantifying the impact of variable BLR diffuse continuum contributions on measured continuum interband delays
Kirk T. Korista,M. R. Goad +1 more
TL;DR: In this article, the authors thank Gary Ferland for his continued development and support of the photoionisation code, and the University of Leicester for the hospitality of their University of Leicestershire.
Journal ArticleDOI
Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142
Edward M. Cackett,Jonathan Gelbord,Yan-Rong Li,Keith Horne,Jian-Min Wang,Aaron J. Barth,Jin-Ming Bai,Wei-Hao Bian,Russell W. Carroll,Pu Du,Rick Edelson,Michael R. Goad,Luis C. Ho,Chen Hu,Viraja Khatu,Bin Luo,Jake Miller,Ye-Fei Yuan +17 more
TL;DR: In this paper, the authors performed an intensive accretion disk reverberation mapping campaign on the high accretion rate active galactic nucleus Mrk 142 in early 2019 and measured significant time lags between the different wavelength light curves, finding that through the UV and optical the wavelength-dependent lags, τ(λ), generally follow the relation τ (λ)∝λ4/3, as expected for theT∝R−3/4profile of a steady-state optically-thick, geometrically-thin disk, though can also be fit by τ
Journal ArticleDOI
Reverberation mapping of active galactic nuclei: from X-ray corona to dusty torus.
TL;DR: In this paper, the authors provide an overview of the reverberation mapping technique and its varied applications and use it to measure black hole masses and to probe the innermost X-ray emitting region, the UV/optical accretion disk, the broad emission line region, and the dusty torus.
References
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Journal ArticleDOI
SExtractor: Software for source extraction
E. Bertin,E. Bertin,S. Arnouts +2 more
TL;DR: The SExtractor ( Source Extractor) as mentioned in this paper is an automated software that optimally detects, deblends, measures and classifies sources from astronomical images, which is particularly suited to the analysis of large extragalactic surveys.
Journal ArticleDOI
Measuring Reddening with Sloan Digital Sky Survey Stellar Spectra and Recalibrating SFD
TL;DR: In this paper, the authors measured the difference between the measured and predicted colors of a star, as derived from stellar parameters from the Sloan Extension for Galactic Understanding and Exploration Stellar Parameter Pipeline, and achieved uncertainties of 56, 34, 25, and 29 mmag in the colors u − g, g − r, r − i, and i − z, per star.
Journal ArticleDOI
Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
TL;DR: Lee et al. as discussed by the authors measured the difference between the measured and predicted colors of a star, as derived from stellar parameters from the SEGUE Stellar Parameter Pipeline, and achieved uncertainties of 56, 34, 25, and 29 mmag in the colors u-g, g-r, r-i, and i-z, per star.
Book ChapterDOI
Black holes in binary systems. Observational appearance
N. I. Shakura,R. A. Sunyaev +1 more
TL;DR: In this paper, the structure and radiation spectrum of the disk around a black hole are investigated. But the authors focus on the formation of a disk around the black hole and not on the physical structure of the accreting matter.
Journal ArticleDOI
Template ultraviolet to near-infrared spectra of star-forming galaxies and their application to K-corrections
Anne L. Kinney,Daniela Calzetti,Ralph C. Bohlin,Kerry Mcquade,Thaisa Storchi-Bergmann,Henrique R. Schmitt +5 more
TL;DR: In this article, the spectral properties of quiescentred and starburst galaxies are used to derive K-corrections as a function of morphological type and redshift. But the improved K-correlations are not sufficient to explain the excess counts in faint blue galaxies.
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