AGN STORM 2. I. First results: A Change in the Weather of Mrk 817
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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 Ly alpha lags suggest that the accretion disk extends beyond the UV broad-line region.
Originalsprog | Engelsk |
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Artikelnummer | 151 |
Tidsskrift | Astrophysical Journal |
Vol/bind | 922 |
Udgave nummer | 2 |
Antal sider | 21 |
ISSN | 0004-637X |
DOI | |
Status | Udgivet - 26 nov. 2021 |
Links
- https://arxiv.org/pdf/2105.05840.pdf
Indsendt manuskript
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