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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Continuum Reverberation Mapping of Mrk 876 over Three Years with Remote Robotic Observatories
Astronomical Journal, Volume 953, No. 2, Article 137, Year 2023
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Description
Continuum reverberation mapping probes the size scale of the optical continuum-emitting region in active galactic nuclei (AGN). Through 3 yr of multiwavelength photometric monitoring in the optical with robotic observatories, we perform continuum reverberation mapping on Mrk 876. All wave bands show large-amplitude variability and are well correlated. Slow variations in the light curves broaden the cross-correlation function (CCF) significantly, requiring detrending in order to robustly recover interband lags. We measure consistent interband lags using three techniques (CCF, JAVELIN, and PyROA), with a lag of around 13 days from u to z. These lags are longer than the expected radius of 12 days for the self-gravitating radius of the disk. The lags increase with wavelength roughly following λ4/3, as would be expected from thin disk theory, but the lag normalization is approximately a factor of 3 longer than expected, as has also been observed in other AGN. The lag in the i band shows an excess that we attribute to variable Hα broad-line emission. A flux–flux analysis shows a variable spectrum that follows fν ∝ λ−1/3, as expected for a disk, and an excess in the i band that also points to strong variable Hα emission in that band. © 2023. The Author(s).
Authors & Co-Authors
Miller, Jake A.
United States, Detroit
Wayne State University
Cackett, Edward M.
United States, Detroit
Wayne State University
Goad, Michael R.
United Kingdom, Leicester
University of Leicester
Hörne, Keith D.
United Kingdom, St Andrews
University of st Andrews
Barth, Aaron J.
United States, Irvine
University of California, Irvine
Romero-Colmenero, Encarnacion
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Fausnaugh, Michael M.
United States, Columbus
The Ohio State University
Gelbord, Jonathan M.
United States, Burlington
Spectral Sciences, Inc.
Korista, Kirk T.
Unknown Affiliation
Landt, Hermine
United Kingdom, Durham
Durham University
Treu, Tommaso L.
United States, Los Angeles
University of California, Los Angeles
Winkler, Hartmut
South Africa, Johannesburg
University of Johannesburg
Statistics
Authors: 12
Affiliations: 11
Identifiers
Doi:
10.3847/1538-4357/ace342
ISSN:
00046256
Research Areas
Environmental