Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband Photometry
In our previous work on broadband photometric reverberation mapping (PRM), we proposed the interpolated cross-correlation function (ICCF)-Cut process to obtain the time lags of the H α emission line from two broadband lightcurves via subtracting the continuum emission from the line band. Extending t...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad34d6 |
| _version_ | 1797198315231641600 |
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| author | Qinchun Ma Yuhan Wen Xue-Bing Wu Huapeng Gu Yuming Fu |
| author_facet | Qinchun Ma Yuhan Wen Xue-Bing Wu Huapeng Gu Yuming Fu |
| author_sort | Qinchun Ma |
| collection | DOAJ |
| description | In our previous work on broadband photometric reverberation mapping (PRM), we proposed the interpolated cross-correlation function (ICCF)-Cut process to obtain the time lags of the H α emission line from two broadband lightcurves via subtracting the continuum emission from the line band. Extending the work, we enlarge our sample to the Zwicky Transient Facility (ZTF) database. We adopt two criteria to select 123 type 1 active galactic nuclei (AGNs) with sufficient variability and smooth light curves from 3537 AGNs at z < 0.09 with more than 100 epoch observations in the g and r bands from the ZTF database. We calculate the H α time lags for 23 of them that have previous spectroscopic reverberation mapping (SRM) results using the ICCF-Cut, Just Another Vehicle for Estimating Lags In Nuclei (JAVELIN), and χ ^2 methods. Our obtained H α time lags are slightly larger than the H β time lags, which is consistent with the previous SRM results and the theoretical model of the AGN broad-line region. The comparisons between the SRM and PRM lag distributions and between the subtracted emission line light curves indicate that after selecting AGNs with the two criteria, combining the ICCF-Cut, JAVELIN, and χ ^2 methods provides an efficient way to get the reliable H α lags from the broadband PRM. Such techniques can be used to estimate the black hole masses of a large sample of AGNs in large multiepoch photometric sky surveys such as the Legacy Survey of Space and Time and the survey from the Wide Field Survey Telescope in the near future. |
| first_indexed | 2024-04-24T06:57:54Z |
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| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-04-24T06:57:54Z |
| publishDate | 2024-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj.art-9d9241b481f245d98b57b14727437bba2024-04-22T10:24:51ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-019661510.3847/1538-4357/ad34d6Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband PhotometryQinchun Ma0https://orcid.org/0000-0003-0827-2273Yuhan Wen1Xue-Bing Wu2https://orcid.org/0000-0002-7350-6913Huapeng Gu3Yuming Fu4https://orcid.org/0000-0002-0759-0504Department of Astronomy, School of Physics, Peking University , Beijing 100871, People's Republic of China ; maqinchun@pku.edu.cn; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of China ; wuxb@pku.edu.cnDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People's Republic of China ; maqinchun@pku.edu.cn; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of China ; wuxb@pku.edu.cnDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People's Republic of China ; maqinchun@pku.edu.cn; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of China ; wuxb@pku.edu.cnDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People's Republic of China ; maqinchun@pku.edu.cn; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of China ; wuxb@pku.edu.cnLeiden Observatory, Leiden University , P.O. Box 9513, NL-2300 RA Leiden, The Netherlands; Kapteyn Astronomical Institute, University of Groningen , P.O. Box 800, NL-9700 AV Groningen, The NetherlandsIn our previous work on broadband photometric reverberation mapping (PRM), we proposed the interpolated cross-correlation function (ICCF)-Cut process to obtain the time lags of the H α emission line from two broadband lightcurves via subtracting the continuum emission from the line band. Extending the work, we enlarge our sample to the Zwicky Transient Facility (ZTF) database. We adopt two criteria to select 123 type 1 active galactic nuclei (AGNs) with sufficient variability and smooth light curves from 3537 AGNs at z < 0.09 with more than 100 epoch observations in the g and r bands from the ZTF database. We calculate the H α time lags for 23 of them that have previous spectroscopic reverberation mapping (SRM) results using the ICCF-Cut, Just Another Vehicle for Estimating Lags In Nuclei (JAVELIN), and χ ^2 methods. Our obtained H α time lags are slightly larger than the H β time lags, which is consistent with the previous SRM results and the theoretical model of the AGN broad-line region. The comparisons between the SRM and PRM lag distributions and between the subtracted emission line light curves indicate that after selecting AGNs with the two criteria, combining the ICCF-Cut, JAVELIN, and χ ^2 methods provides an efficient way to get the reliable H α lags from the broadband PRM. Such techniques can be used to estimate the black hole masses of a large sample of AGNs in large multiepoch photometric sky surveys such as the Legacy Survey of Space and Time and the survey from the Wide Field Survey Telescope in the near future.https://doi.org/10.3847/1538-4357/ad34d6Active galactic nucleiReverberation mappingSupermassive black holes |
| spellingShingle | Qinchun Ma Yuhan Wen Xue-Bing Wu Huapeng Gu Yuming Fu Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband Photometry The Astrophysical Journal Active galactic nuclei Reverberation mapping Supermassive black holes |
| title | Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband Photometry |
| title_full | Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband Photometry |
| title_fullStr | Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband Photometry |
| title_full_unstemmed | Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband Photometry |
| title_short | Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband Photometry |
| title_sort | hα time delays of active galactic nuclei from the zwicky transient facility broadband photometry |
| topic | Active galactic nuclei Reverberation mapping Supermassive black holes |
| url | https://doi.org/10.3847/1538-4357/ad34d6 |
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