The Astrophysical Journal (Jan 2023)
The Seoul National University AGN Monitoring Project. IV. Hα Reverberation Mapping of Six AGNs and the Hα Size–Luminosity Relation
- Hojin Cho,
- Jong-Hak Woo,
- Shu Wang,
- Donghoon Son,
- Jaejin Shin,
- Suvendu Rakshit,
- Aaron J. Barth,
- Vardha N. Bennert,
- Elena Gallo,
- Edmund Hodges-Kluck,
- Tommaso Treu,
- Hyun-Jin Bae,
- Wanjin Cho,
- Adi Foord,
- Jaehyuk Geum,
- Yashashree Jadhav,
- Yiseul Jeon,
- Kyle M. Kabasares,
- Daeun Kang,
- Wonseok Kang,
- Changseok Kim,
- Donghwa Kim,
- Minjin Kim,
- Taewoo Kim,
- Huynh Anh N. Le,
- Matthew A. Malkan,
- Amit Kumar Mandal,
- Daeseong Park,
- Songyoun Park,
- Hyun-il Sung,
- Vivian U,
- Peter R. Williams
Affiliations
- Hojin Cho
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Jong-Hak Woo
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Shu Wang
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Donghoon Son
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Jaejin Shin
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]; Major in Astronomy and Atmospheric Sciences, Kyungpook National University , Daegu 41566, Republic of Korea; Korea Astronomy and Space Science Institute , Daejeon 34055, Republic of Korea
- Suvendu Rakshit
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]; Aryabhatta Research Institute of Observational Sciences , Manora Peak, Nainital-263001, Uttarakhand, India
- Aaron J. Barth
- ORCiD
- Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California , Irvine, CA 92697-4575, USA
- Vardha N. Bennert
- ORCiD
- Physics Department, California Polytechnic State University , San Luis Obispo, CA 93407, USA
- Elena Gallo
- ORCiD
- Department of Astronomy, University of Michigan , Ann Arbor, MI 48109, USA
- Edmund Hodges-Kluck
- ORCiD
- Department of Astronomy, University of Michigan , Ann Arbor, MI 48109, USA; NASA/GSFC , Code 662, Greenbelt, MD 20771, USA
- Tommaso Treu
- ORCiD
- Department of Physics and Astronomy, University of California , Los Angeles, CA 90095-1547, USA
- Hyun-Jin Bae
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]; Department of Astronomy, Yonsei University , Seoul 03722, Republic of Korea
- Wanjin Cho
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Adi Foord
- ORCiD
- Kavli Institute of Particle Astrophysics and Cosmology, Stanford University , Stanford, CA 94305, USA
- Jaehyuk Geum
- Major in Astronomy and Atmospheric Sciences, Kyungpook National University , Daegu 41566, Republic of Korea
- Yashashree Jadhav
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Yiseul Jeon
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Kyle M. Kabasares
- ORCiD
- Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California , Irvine, CA 92697-4575, USA
- Daeun Kang
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Wonseok Kang
- ORCiD
- National Youth Space Center , Goheung 59567, Republic of Korea; Spacebeam Inc. , Cheongju 28165, Republic of Korea
- Changseok Kim
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Donghwa Kim
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]; Graduate School of Data Science, Seoul National University , Seoul 08826, Republic of Korea
- Minjin Kim
- ORCiD
- Major in Astronomy and Atmospheric Sciences, Kyungpook National University , Daegu 41566, Republic of Korea
- Taewoo Kim
- ORCiD
- National Youth Space Center , Goheung 59567, Republic of Korea; Spacebeam Inc. , Cheongju 28165, Republic of Korea; Department of Astronomy and Space Science, Chungbuk National University , Cheongju 28644, Republic of Korea
- Huynh Anh N. Le
- ORCiD
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]; CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China , Hefei 230026, People’s Republic of China
- Matthew A. Malkan
- ORCiD
- Department of Physics and Astronomy, University of California , Los Angeles, CA 90095-1547, USA
- Amit Kumar Mandal
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Daeseong Park
- ORCiD
- Major in Astronomy and Atmospheric Sciences, Kyungpook National University , Daegu 41566, Republic of Korea; Korea Astronomy and Space Science Institute , Daejeon 34055, Republic of Korea
- Songyoun Park
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; [email protected]
- Hyun-il Sung
- ORCiD
- Korea Astronomy and Space Science Institute , Daejeon 34055, Republic of Korea
- Vivian U
- ORCiD
- Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California , Irvine, CA 92697-4575, USA
- Peter R. Williams
- ORCiD
- Department of Physics and Astronomy, University of California , Los Angeles, CA 90095-1547, USA
- DOI
- https://doi.org/10.3847/1538-4357/ace1e5
- Journal volume & issue
-
Vol. 953,
no. 2
p. 142
Abstract
The broad-line region (BLR) size–luminosity relation has paramount importance for estimating the mass of black holes in active galactic nuclei (AGNs). Traditionally, the size of the H β BLR is often estimated from the optical continuum luminosity at 5100 Å, while the size of the H α BLR and its correlation with the luminosity is much less constrained. As a part of the Seoul National University AGN Monitoring Project, which provides 6 yr photometric and spectroscopic monitoring data, we present our measurements of the H α lags of high-luminosity AGNs. Combined with the measurements for 42 AGNs from the literature, we derive the size–luminosity relations of the H α BLR against the broad H α and 5100 Å continuum luminosities. We find the slope of the relations to be 0.61 ± 0.04 and 0.59 ± 0.04, respectively, which are consistent with the H β size–luminosity relation. Moreover, we find a linear relation between the 5100 Å continuum luminosity and the broad H α luminosity across 7 orders of magnitude. Using these results, we propose a new virial mass estimator based on the H α broad emission line, finding that the previous mass estimates based on scaling relations in the literature are overestimated by up to 0.7 dex at masses lower than 10 ^7 M _⊙ .
Keywords
