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| Format: | Preprint |
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2023
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| Online-Zugang: | https://arxiv.org/abs/2308.00742 |
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| author | Homayouni, Y. Kriss, Gerard A. De Rosa, Gisella Plesha, Rachel Cackett, Edward M. Goad, Michael R. Korista, Kirk T. Horne, Keith Fischer, Travis Waters, Tim Barth, Aaron J. Kara, Erin A. Landt, Hermine Arav, Nahum Boizelle, Benjamin D. Bentz, Misty C. Brotherton, Michael S. Chelouche, Doron Bonta, Elena Dalla Dehghanian, Maryam Du, Pu Ferland, Gary J. Fian, Carina Gelbord, Jonathan Grier, Catherine J. Hall, Patrick B. Hu, Chen Ilic, Dragana Joner, Michael D. Kaastra, Jelle Kaspi, Shai Kovacevic, Andjelka B. Kynoch, Daniel Li, Yan-Rong Mehdipour, Missagh Miller, Jake A. Mitchell, Jake Montano, John Netzer, Hagai Neustadt, J. M. M. Partington, Ethan Popovic, Luka C. Proga, Daniel Storchi-Bergmann, Thaisa Sanmartim, David Siebert, Matthew R. Treu, Tommaso Vestergaard, Marianne Wang, Jian-Min Ward, Martin J. Zaidouni, Fatima Zu, Ying |
| author_facet | Homayouni, Y. Kriss, Gerard A. De Rosa, Gisella Plesha, Rachel Cackett, Edward M. Goad, Michael R. Korista, Kirk T. Horne, Keith Fischer, Travis Waters, Tim Barth, Aaron J. Kara, Erin A. Landt, Hermine Arav, Nahum Boizelle, Benjamin D. Bentz, Misty C. Brotherton, Michael S. Chelouche, Doron Bonta, Elena Dalla Dehghanian, Maryam Du, Pu Ferland, Gary J. Fian, Carina Gelbord, Jonathan Grier, Catherine J. Hall, Patrick B. Hu, Chen Ilic, Dragana Joner, Michael D. Kaastra, Jelle Kaspi, Shai Kovacevic, Andjelka B. Kynoch, Daniel Li, Yan-Rong Mehdipour, Missagh Miller, Jake A. Mitchell, Jake Montano, John Netzer, Hagai Neustadt, J. M. M. Partington, Ethan Popovic, Luka C. Proga, Daniel Storchi-Bergmann, Thaisa Sanmartim, David Siebert, Matthew R. Treu, Tommaso Vestergaard, Marianne Wang, Jian-Min Ward, Martin J. Zaidouni, Fatima Zu, Ying |
| contents | An intensive reverberation mapping campaign on the Seyfert 1 galaxy Mrk817 using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) revealed significant variations in the response of the broad UV emission lines to fluctuations in the continuum emission. The response of the prominent UV emission lines changes over a $\sim$60-day duration, resulting in distinctly different time lags in the various segments of the light curve over the 14 months observing campaign. One-dimensional echo-mapping models fit these variations if a slowly varying background is included for each emission line. These variations are more evident in the CIV light curve, which is the line least affected by intrinsic absorption in Mrk817 and least blended with neighboring emission lines. We identify five temporal windows with distinct emission line response, and measure their corresponding time delays, which range from 2 to 13 days. These temporal windows are plausibly linked to changes in the UV and X-ray obscuration occurring during these same intervals. The shortest time lags occur during periods with diminishing obscuration, whereas the longest lags occur during periods with rising obscuration. We propose that the obscuring outflow shields the ultraviolet broad lines from the ionizing continuum. The resulting change in the spectral energy distribution of the ionizing continuum, as seen by clouds at a range of distances from the nucleus, is responsible for the changes in the line response. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_00742 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817 Homayouni, Y. Kriss, Gerard A. De Rosa, Gisella Plesha, Rachel Cackett, Edward M. Goad, Michael R. Korista, Kirk T. Horne, Keith Fischer, Travis Waters, Tim Barth, Aaron J. Kara, Erin A. Landt, Hermine Arav, Nahum Boizelle, Benjamin D. Bentz, Misty C. Brotherton, Michael S. Chelouche, Doron Bonta, Elena Dalla Dehghanian, Maryam Du, Pu Ferland, Gary J. Fian, Carina Gelbord, Jonathan Grier, Catherine J. Hall, Patrick B. Hu, Chen Ilic, Dragana Joner, Michael D. Kaastra, Jelle Kaspi, Shai Kovacevic, Andjelka B. Kynoch, Daniel Li, Yan-Rong Mehdipour, Missagh Miller, Jake A. Mitchell, Jake Montano, John Netzer, Hagai Neustadt, J. M. M. Partington, Ethan Popovic, Luka C. Proga, Daniel Storchi-Bergmann, Thaisa Sanmartim, David Siebert, Matthew R. Treu, Tommaso Vestergaard, Marianne Wang, Jian-Min Ward, Martin J. Zaidouni, Fatima Zu, Ying Astrophysics of Galaxies An intensive reverberation mapping campaign on the Seyfert 1 galaxy Mrk817 using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) revealed significant variations in the response of the broad UV emission lines to fluctuations in the continuum emission. The response of the prominent UV emission lines changes over a $\sim$60-day duration, resulting in distinctly different time lags in the various segments of the light curve over the 14 months observing campaign. One-dimensional echo-mapping models fit these variations if a slowly varying background is included for each emission line. These variations are more evident in the CIV light curve, which is the line least affected by intrinsic absorption in Mrk817 and least blended with neighboring emission lines. We identify five temporal windows with distinct emission line response, and measure their corresponding time delays, which range from 2 to 13 days. These temporal windows are plausibly linked to changes in the UV and X-ray obscuration occurring during these same intervals. The shortest time lags occur during periods with diminishing obscuration, whereas the longest lags occur during periods with rising obscuration. We propose that the obscuring outflow shields the ultraviolet broad lines from the ionizing continuum. The resulting change in the spectral energy distribution of the ionizing continuum, as seen by clouds at a range of distances from the nucleus, is responsible for the changes in the line response. |
| title | AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2308.00742 |