AGN STORM 2. I. First results: A Change in the Weather of Mrk 817

AGN STORM 2. I. First results: A Change in the Weather of Mrk 817
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AGN STORM 2. I. 第一个结果:Mrk 817 天气的变化

DOI:
10.3847/1538-4357/ac2159
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发表时间:
2021-05
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
John Mon
John Mon
中科院分区:
其他
文献类型:
--
作者:
Erin Kara;Missagh Mehdipour;Gerard A. Kriss;Edward M. Cackett;Nahum Arav;Aaron J. Barth;Doyee Byun;Michael S. Brotherton;Gisella De Rosa;Jonathan Gelbord;Juan V. Hernández Santisteban;Chen Hu;Jelle Kaastra;Hermine L;t;Yan-Rong Li;Jake A. Miller;John Mon

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抽象的。我们目前的第一个结果,从正在进行的,密集的,多波长的监测计划的发光塞弗特1星系Mrk 817。虽然这个活跃的星系核,在一定程度上,选择其历史上未被掩盖的性质,我们发现,X射线光谱是高度吸收,有新的蓝移,宽,窄的紫外线吸收线,这表明,一个无尘,电离遮蔽位于内部宽线区域部分覆盖了中央源。尽管遮蔽,我们测量紫外线和光学连续混响滞后一致的中心照明Shakura-Sunyaev薄吸积盘,并测量混响滞后与光学宽线区域,如预期的。然而,在运动的前55天,当遮蔽变得最极端时,我们观察到紫外线连续谱和紫外线宽发射线变化的解耦。在接下来的42天的战役中,这种相关性恢复了,因为Mrk 817进入了一种不那么模糊的状态。短的Civ和Lyα滞后表明吸积盘延伸到紫外宽线区域之外。
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.
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