AGN STORM 2. I. First results: A Change in the Weather of Mrk 817 | Instituto de Astrofísica de Andalucía

DOI:

10.3847/1538-4357/ac2159

Publication date:

24/12/2021

Main author:

Kara, Erin

IAA authors:

Aceituno, Jesús

Authors:

Kara, Erin;Mehdipour, Missagh;Kriss, Gerard A.;Cackett, Edward M.;Arav, Nahum;Barth, Aaron J.;Byun, Doyee;Brotherton, Michael S.;De Rosa, Gisella;Gelbord, Jonathan;Hernández Santisteban, Juan V.;Hu, Chen;Kaastra, Jelle;Landt, Hermine;Li, Yan-Rong;Miller, Jake A.;Montano, John;Partington, Ethan;Aceituno, Jesús;Bai, Jin-Ming;Bao, Dongwei;Bentz, Misty C.;Brink, Thomas G.;Chelouche, Doron;Chen, Yong-Jie;Colmenero, Encarni Romero;Dalla Bontà, Elena;Dehghanian, Maryam;Du, Pu;Edelson, Rick;Ferland, Gary J.;Ferrarese, Laura;Fian, Carina;Filippenko, Alexei V.;Fischer, Travis;Goad, Michael R.;González Buitrago, Diego H.;Gorjian, Varoujan;Grier, Catherine J.;Guo, Wei-Jian;Hall, Patrick B.;Ho, Luis C.;Homayouni, Y.;Horne, Keith;Ilić, Dragana;Jiang, Bo-Wei;Joner, Michael D.;Kaspi, Shai;Kochanek, Christopher S.;Korista, Kirk T.;Kynoch, Daniel;Li, Sha-Sha;Liu, Jun-Rong;McHardy, Ian M.;McLane, Jacob N.;Mitchell, Jake A. J.;Netzer, Hagai;Olson, Kianna A.;Pogge, Richard W.;Popović, Luka Č.;Proga, Daniel;Storchi-Bergmann, Thaisa;Strasburger, Erika;Treu, Tommaso;Vestergaard, Marianne;Wang, Jian-Min;Ward, Martin J.;Waters, Tim;Williams, Peter R.;Yang, Sen;Yao, Zhu-Heng;Zastrocky, Theodora E.;Zhai, Shuo;Zu, Ying

Journal:

The Astrophysical Journal

Publication type:

Article

Volume:

922

Pages:

151

Abstract:

We present the first results from the ongoing, intensive, multiwavelength monitoring program of the luminous Seyfert 1 galaxy Mrk 817. While this active galactic nucleus was, in part, selected for its historically unobscured nature, we discovered that the X-ray spectrum is highly absorbed, and there are new blueshifted, broad, and narrow UV absorption lines, which suggest that a dust-free, ionized obscurer located at the inner broad-line region partially covers the central source. Despite the obscuration, we measure UV and optical continuum reverberation lags consistent with a centrally illuminated Shakura-Sunyaev thin accretion disk, and measure reverberation lags associated with the optical broad-line region, as expected. However, in the first 55 days of the campaign, when the obscuration was becoming most extreme, we observe a de-coupling of the UV continuum and the UV broad emission-line variability. The correlation recovered in the next 42 days of the campaign, as Mrk 817 entered a less obscured state. The short C IV and Lyα lags suggest that the accretion disk extends beyond the UV broad-line region.

Database:

ADS

URL:

https://ui.adsabs.harvard.edu/#abs/2021ApJ...922..151K/abstract

ADS Bibcode:

2021ApJ...922..151K

Keywords:

159;Astrophysics - High Energy Astrophysical Phenomena;Astrophysics - Astrophysics of Galaxies