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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.02652 |
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| _version_ | 1866910634245881856 |
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| author | Netzer, Hagai Goad, Michael R. Barth, Aaron J. Cackett, Edward M. Horne, Keith Hu, Chen Kara, Erin Korista, Kirk T. Kriss, Gerard A. Lewin, Collin Montano, John Arav, Nahum Behar, Ehud Brotherton, Michael S. Chelouche, Doron de Rosa, Gisella Bonta, Elena Dalla Dehghanian, Maryam Ferland, Gary J. Fian, Carina Homayouni, Yasaman Ilic, Dragana Kaspi, Shai Kovacevic, Andjelka B. Landt, Hermine Popovic, Luka C. Storchi-Bergmann, Thaisa Wang, Jian-Min Zaidouni, Fatima |
| author_facet | Netzer, Hagai Goad, Michael R. Barth, Aaron J. Cackett, Edward M. Horne, Keith Hu, Chen Kara, Erin Korista, Kirk T. Kriss, Gerard A. Lewin, Collin Montano, John Arav, Nahum Behar, Ehud Brotherton, Michael S. Chelouche, Doron de Rosa, Gisella Bonta, Elena Dalla Dehghanian, Maryam Ferland, Gary J. Fian, Carina Homayouni, Yasaman Ilic, Dragana Kaspi, Shai Kovacevic, Andjelka B. Landt, Hermine Popovic, Luka C. Storchi-Bergmann, Thaisa Wang, Jian-Min Zaidouni, Fatima |
| contents | The local (z=0.0315) AGN Mrk 817, was monitored over more than 500 days with space-borne and ground-based instruments as part of a large international campaign AGN STORM 2. Here, we present a comprehensive analysis of the broad-band continuum variations using detailed modeling of the broad line region (BLR), several types of disk winds classified by their optical depth, and new numerical simulations. We find that diffuse continuum (DC) emission, with additional contributions from strong and broad emission lines, can explain the continuum lags observed in this source during high and low luminosity phases. Disk illumination by the variable X-ray corona contributes only a small fraction of the observed continuum lags. Our BLR models assume radiation pressure-confined clouds distributed over a distance of 2-122 light days. We present calculated mean-emissivity radii of many emission lines, and DC emission, and suggest a simple, transfer-function-dependent method that ties them to cross-correlation lag determinations. We do not find clear indications for large optical depth winds but identify the signature of lower column density winds. In particular, we associate the shortest observed continuum lags with a combination of tau(1 Ryd) approx. 2 wind and a partly shielded BLR. Even smaller optical depth winds may be associated with X-ray absorption features and with noticeable variations in the width and lags of several high ionization lines like HeII and CIV. Finally, we demonstrate the effect of torus dust emission on the observed lags in the i and z bands. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_02652 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | AGN STORM 2: X. The origin of the interband continuum delays in Mrk 817 Netzer, Hagai Goad, Michael R. Barth, Aaron J. Cackett, Edward M. Horne, Keith Hu, Chen Kara, Erin Korista, Kirk T. Kriss, Gerard A. Lewin, Collin Montano, John Arav, Nahum Behar, Ehud Brotherton, Michael S. Chelouche, Doron de Rosa, Gisella Bonta, Elena Dalla Dehghanian, Maryam Ferland, Gary J. Fian, Carina Homayouni, Yasaman Ilic, Dragana Kaspi, Shai Kovacevic, Andjelka B. Landt, Hermine Popovic, Luka C. Storchi-Bergmann, Thaisa Wang, Jian-Min Zaidouni, Fatima Astrophysics of Galaxies The local (z=0.0315) AGN Mrk 817, was monitored over more than 500 days with space-borne and ground-based instruments as part of a large international campaign AGN STORM 2. Here, we present a comprehensive analysis of the broad-band continuum variations using detailed modeling of the broad line region (BLR), several types of disk winds classified by their optical depth, and new numerical simulations. We find that diffuse continuum (DC) emission, with additional contributions from strong and broad emission lines, can explain the continuum lags observed in this source during high and low luminosity phases. Disk illumination by the variable X-ray corona contributes only a small fraction of the observed continuum lags. Our BLR models assume radiation pressure-confined clouds distributed over a distance of 2-122 light days. We present calculated mean-emissivity radii of many emission lines, and DC emission, and suggest a simple, transfer-function-dependent method that ties them to cross-correlation lag determinations. We do not find clear indications for large optical depth winds but identify the signature of lower column density winds. In particular, we associate the shortest observed continuum lags with a combination of tau(1 Ryd) approx. 2 wind and a partly shielded BLR. Even smaller optical depth winds may be associated with X-ray absorption features and with noticeable variations in the width and lags of several high ionization lines like HeII and CIV. Finally, we demonstrate the effect of torus dust emission on the observed lags in the i and z bands. |
| title | AGN STORM 2: X. The origin of the interband continuum delays in Mrk 817 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.02652 |