Corona-heated Accretion-disk Reprocessing: Frequency-resolved Lag Predictions for UV/Optical Reverberation Mapping of Active Galactic Nuclei
Continuum reverberation mapping with high-cadence, long-term UV/optical monitoring of active galactic nuclei (AGNs) enables us to resolve the AGN central engine sizes on different timescales. The frequency-resolved time lags of NGC 5548 (the target for the AGN STORM I campaign) are inconsistent with...
| Main Authors: | , , |
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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/ad16ea |
| _version_ | 1797307120308191232 |
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| author | Jie Chen Mouyuan Sun Zhi-Xiang Zhang |
| author_facet | Jie Chen Mouyuan Sun Zhi-Xiang Zhang |
| author_sort | Jie Chen |
| collection | DOAJ |
| description | Continuum reverberation mapping with high-cadence, long-term UV/optical monitoring of active galactic nuclei (AGNs) enables us to resolve the AGN central engine sizes on different timescales. The frequency-resolved time lags of NGC 5548 (the target for the AGN STORM I campaign) are inconsistent with the X-ray reprocessing of the classical Shakura–Sunyaev disk model. Here we show that the frequency-resolved time lags in NGC 5548 can be well produced by the Corona-Heated Accretion-disk Reprocessing (CHAR) model. Moreover, we make CHAR model predictions of the frequency-resolved time lags for Mrk 817, the source of the AGN STORM II campaign. We also obtain frequency-resolved time lags as a function of the BH mass and Eddington ratio, which is valid for BH masses from 10 ^6.5 to 10 ^9 M _⊙ and Eddington ratios from 0.01 to 1. Moreover, we demonstrate that with the time spans of current continuum reverberation-mapping campaigns, the lag–luminosity relation of the CHAR model can be ${\tau }_{\mathrm{gz}}\propto {L}_{5100}^{0.55\pm 0.04}$ , which is consistent with observations. Future observations can test our results and shed new light on resolving the AGN central engine. |
| first_indexed | 2024-03-08T00:52:42Z |
| format | Article |
| id | doaj.art-363820d738db46da9f49ef319fae2a71 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-08T00:52:42Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-363820d738db46da9f49ef319fae2a712024-02-14T17:17:52ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01962213410.3847/1538-4357/ad16eaCorona-heated Accretion-disk Reprocessing: Frequency-resolved Lag Predictions for UV/Optical Reverberation Mapping of Active Galactic NucleiJie Chen0https://orcid.org/0000-0002-4765-1500Mouyuan Sun1https://orcid.org/0000-0002-0771-2153Zhi-Xiang Zhang2https://orcid.org/0000-0002-2419-6875Department of Astronomy, Xiamen University , Xiamen, Fujian 361005, People's Republic of China ; msun88@xmu.edu.cn; Department of Astronomy, School of Physics, Peking University , Beijing 100871, People's Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of ChinaDepartment of Astronomy, Xiamen University , Xiamen, Fujian 361005, People's Republic of China ; msun88@xmu.edu.cnDepartment of Astronomy, Xiamen University , Xiamen, Fujian 361005, People's Republic of China ; msun88@xmu.edu.cnContinuum reverberation mapping with high-cadence, long-term UV/optical monitoring of active galactic nuclei (AGNs) enables us to resolve the AGN central engine sizes on different timescales. The frequency-resolved time lags of NGC 5548 (the target for the AGN STORM I campaign) are inconsistent with the X-ray reprocessing of the classical Shakura–Sunyaev disk model. Here we show that the frequency-resolved time lags in NGC 5548 can be well produced by the Corona-Heated Accretion-disk Reprocessing (CHAR) model. Moreover, we make CHAR model predictions of the frequency-resolved time lags for Mrk 817, the source of the AGN STORM II campaign. We also obtain frequency-resolved time lags as a function of the BH mass and Eddington ratio, which is valid for BH masses from 10 ^6.5 to 10 ^9 M _⊙ and Eddington ratios from 0.01 to 1. Moreover, we demonstrate that with the time spans of current continuum reverberation-mapping campaigns, the lag–luminosity relation of the CHAR model can be ${\tau }_{\mathrm{gz}}\propto {L}_{5100}^{0.55\pm 0.04}$ , which is consistent with observations. Future observations can test our results and shed new light on resolving the AGN central engine.https://doi.org/10.3847/1538-4357/ad16eaAccretionActive galactic nucleiSupermassive black holes |
| spellingShingle | Jie Chen Mouyuan Sun Zhi-Xiang Zhang Corona-heated Accretion-disk Reprocessing: Frequency-resolved Lag Predictions for UV/Optical Reverberation Mapping of Active Galactic Nuclei The Astrophysical Journal Accretion Active galactic nuclei Supermassive black holes |
| title | Corona-heated Accretion-disk Reprocessing: Frequency-resolved Lag Predictions for UV/Optical Reverberation Mapping of Active Galactic Nuclei |
| title_full | Corona-heated Accretion-disk Reprocessing: Frequency-resolved Lag Predictions for UV/Optical Reverberation Mapping of Active Galactic Nuclei |
| title_fullStr | Corona-heated Accretion-disk Reprocessing: Frequency-resolved Lag Predictions for UV/Optical Reverberation Mapping of Active Galactic Nuclei |
| title_full_unstemmed | Corona-heated Accretion-disk Reprocessing: Frequency-resolved Lag Predictions for UV/Optical Reverberation Mapping of Active Galactic Nuclei |
| title_short | Corona-heated Accretion-disk Reprocessing: Frequency-resolved Lag Predictions for UV/Optical Reverberation Mapping of Active Galactic Nuclei |
| title_sort | corona heated accretion disk reprocessing frequency resolved lag predictions for uv optical reverberation mapping of active galactic nuclei |
| topic | Accretion Active galactic nuclei Supermassive black holes |
| url | https://doi.org/10.3847/1538-4357/ad16ea |
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