AGN STORM 2. XII. Ground-based Optical Photometry and Lag Measurements of Mrk 817
文献类型：期刊论文
| 作者 | Montano, John W.2; Barth, Aaron J.2; Horne, Keith3; Cackett, Edward M.4; Rosa, Gisella De5; Homayouni, Y.5,6; Kara, Erin A.7; Kriss, Gerard A.5; Landt, Hermine8; Apolonio, Gilvan G.9 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-06-01 |
| 卷号 | 1003期号:2 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae6103 |
| 产权排序 | 第29完成单位 |
| 文献子类 | Article |
| 英文摘要 | We present the ground-based imaging campaign and light curves of Markarian 817 as part of the multiwavelength monitoring program AGN STORM 2. Observations were carried out over 1.4 yr in the uBgVriz filters, with a median cadence of 0.4 day in the g band. Reverberation lags are measured using three methods (interpolated cross-correlation function (ICCF), Just Another Vehicle for Estimating Lags In Nuclei, and PyROA) with the Swift UVW2 band (1928 & Aring;) as the reference light curve. The ICCF centroid lags range from 3.0 +/- 0.8 days for the u band up to 7.9 +/- 1.5 days for z, and are consistent with a tau proportional to lambda 4/3 dependence, the relation expected for lamppost reprocessing by a Shakura-Sunyaev disk. Lags measured with the other methods are systematically shorter, and deviate from a lambda 4/3 power-law spectrum at long wavelengths. The lags exceed thin-disk reprocessing predictions by factors of similar to 3-6, similar to the disk size discrepancy seen in other Seyfert galaxies. We divide the campaign into three epochs with different levels of mean luminosity and X-ray obscuring column density and find that the lags vary by as much as a factor of 2 between epochs. The intrinsic spectral energy distribution is bluer and brighter during the first third of the campaign, and the longest continuum reverberation lags are obtained during that period. These results suggest that changes in ionizing luminosity can produce large variations in continuum lags on short timescales by altering the diffuse continuum luminosity emitted by the broad-line region (BLR) and/or obscuring outflow, although changes in obscuration between the central engine and BLR may also contribute to the lag variations. |
| 学科主题 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | ACTIVE GALACTIC NUCLEI ; SUPERMASSIVE BLACK-HOLES ; BROAD-LINE REGION ; RADIUS-LUMINOSITY RELATIONSHIP ; COSMIC ORIGINS SPECTROGRAPH ; X-RAY REVERBERATION ; ACCRETION-DISK ; CONTINUUM REVERBERATION ; SPACE TELESCOPE ; ULTRAVIOLET OBSERVATIONS |
| 资助项目 | National Science Foundation (NSF)[AST-1907290]; Space Telescope Science Institute (STScI)[NAS5-26555] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001770263500001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Science Foundation (NSF)[AST-1907290] ; Space Telescope Science Institute (STScI)[NAS5-26555] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29227]  |
| 专题 | 星系类星体研究组 |
| 通讯作者 | Montano, John W. |
| 作者单位 | 1.School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel; 2.Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA 92697-4575, USA; 3.SUPA School of Physics and Astronomy, North Haugh, St. Andrews, KY16 9SS, Scotland, UK; 4.Department of Physics and Astronomy, Wayne State University, 666 W. Hancock St., Detroit, MI 48201, USA; 5.Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA; 6.University of Connecticut, Department of Physics, 2152 Hillside Rd., Unit 3046, Storrs, CT 06269-3046, USA; 7.MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; 8.Centre for Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK; 9.Department of Physics and Astronomy, N283 ESC, Brigham Young University, Provo, UT 84602, USA; 10.Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA; |
| 推荐引用方式 GB/T 7714 | Montano, John W.,Barth, Aaron J.,Horne, Keith,et al. AGN STORM 2. XII. Ground-based Optical Photometry and Lag Measurements of Mrk 817[J]. ASTROPHYSICAL JOURNAL,2026,1003(2). |
| APA | Montano, John W..,Barth, Aaron J..,Horne, Keith.,Cackett, Edward M..,Rosa, Gisella De.,...&Zaidouni, Fatima.(2026).AGN STORM 2. XII. Ground-based Optical Photometry and Lag Measurements of Mrk 817.ASTROPHYSICAL JOURNAL,1003(2). |
| MLA | Montano, John W.,et al."AGN STORM 2. XII. Ground-based Optical Photometry and Lag Measurements of Mrk 817".ASTROPHYSICAL JOURNAL 1003.2(2026). |
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来源：云南天文台
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