Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIII. Ultraviolet Time Lag of Hβ Emission in Mrk 142
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Published:2023-11-17
Issue:2
Volume:958
Page:127
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ISSN:0004-637X
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Container-title:The Astrophysical Journal
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language:
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Short-container-title:ApJ
Author:
Khatu Viraja C.ORCID,
Gallagher Sarah C.ORCID,
Horne KeithORCID,
Cackett Edward M.ORCID,
Hu Chen,
Pasquini Sofia,
Hall PatrickORCID,
Wang Jian-MinORCID,
Bian Wei-HaoORCID,
Li Yan-RongORCID,
Bai Jin-Ming,
Chen Yong-Jie,
Du PuORCID,
Goad Michael,
Jiang Bo-WeiORCID,
Li Sha-ShaORCID,
Songsheng Yu-YangORCID,
Wang Chan,
Xiao MingORCID,
Yu Zhe
Abstract
Abstract
We performed a rigorous reverberation-mapping analysis of the broad-line region (BLR) in a highly accreting (L/L
Edd = 0.74–3.4) active galactic nucleus, Markarian 142 (Mrk 142), for the first time using concurrent observations of the inner accretion disk and the BLR to determine a time lag for the Hβ
λ4861 emission relative to the ultraviolet (UV) continuum variations. We used continuum data taken with the Niel Gehrels Swift Observatory in the UVW2 band, and the Las Cumbres Observatory, Dan Zowada Memorial Observatory, and Liverpool Telescope in the g band, as part of the broader Mrk 142 multiwavelength monitoring campaign in 2019. We obtained new spectroscopic observations covering the Hβ broad emission line in the optical from the Gemini North Telescope and the Lijiang 2.4 m Telescope for a total of 102 epochs (over a period of 8 months) contemporaneous to the continuum data. Our primary result states a UV-to-Hβ time lag of
8.68
−
0.72
+
0.75
days in Mrk 142 obtained from light-curve analysis with a Python-based running optimal average algorithm. We placed our new measurements for Mrk 142 on the optical and UV radius–luminosity relations for NGC 5548 to understand the nature of the continuum driver. The positions of Mrk 142 on the scaling relations suggest that UV is closer to the “true” driving continuum than the optical. Furthermore, we obtain
log
(
M
•
/
M
⊙
)
= 6.32 ± 0.29 assuming UV as the primary driving continuum.
Funder
Gouvernement du Canada ∣ Natural Sciences and Engineering Research Council of Canada
National Aeronautics and Space Administration
National Science Foundation
National Science Foundation of China
National Key R&D Program of China
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
1 articles.
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