New clues to jet launching: The inner disks in radio loud quasars may be more stable
文献类型：期刊论文
| 作者 | Cai, ZhenYi1,2; Sun, YuHan1,2; Wang, JunXian1,2; Zhu, FeiFan1,2,3; Gu, WeiMin4,6; Yuan, Feng5,6
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| 刊名 | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
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| 出版日期 | 2019-06-01 |
| 卷号 | 62期号:6页码:14 |
| ISSN号 | 1674-7348 |
| 关键词 | accretion and accretion disks quasars galactic jets |
| DOI | 10.1007/s11433-018-9330-4 |
| 英文摘要 | Jet launching in radio loud (RL) quasars is one of the fundamental problems in astrophysics. Exploring the differences in the inner accretion disk properties between RL and radio quiet (RQ) quasars might yield helpful clues to this puzzle. We previously discovered that the shorter term UV/optical variations of quasars are bluer than the longer term ones, i.e., the so-called timescale- dependent color variation. This is consistent with the scheme that the faster variations come from the inner and hotter disk regions, thus providing a useful tool to map the accretion disk which is otherwise unresolvable. In this work we compare the UV/optical variations of RL quasars in SDSS Stripe 82 to those of several RQ samples, including those matched in redshift-luminosity-black hole mass and/or color-magnitude. We find that while both RL and RQ populations appear bluer when they brighten, RL quasars potentially show a weaker/flatter dependence on timescale in their color variation. We further find that while both RL and RQ populations on average show similar variation amplitudes at long timescales, fast variations of RL sources appear weaker/smaller (at timescales of 25-300 d in the observer's frame), and the difference is more prominent in the g-band than in the r-band. Inhomogeneous disk simulations can qualitatively reproduce these observed differences if the inner accretion disk of RL quasars fluctuates less based on simple toy models. Though the implications are likely model dependent, the discovery points to an interesting diagram that magnetic fields in RL quasars may be prospectively stronger and play a key role in both jet launching and the stabilization of the inner accretion disk. |
| 资助项目 | National Basic Research Program of China[2015CB857005] ; National Natural Science Foundation of China[11233002] ; National Natural Science Foundation of China[11421303] ; National Natural Science Foundation of China[11503024] ; National Natural Science Foundation of China[11873045] ; Chinese Top-notch Young Talents Program, and Frontier Science Key Research Program, China Academy Sciences[QYZDJ-SSW-SLH006] ; Fundamental Research Funds for the Central Universities ; Ministry of Science and Technology of China[2016YFA0400704] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000454519100001 |
| 源URL | [http://119.78.226.72/handle/331011/32017]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Cai, ZhenYi; Sun, YuHan; Wang, JunXian |
| 作者单位 | 1.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China 2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China 3.Penn State Univ, Dept Astron & Astrophys, 537 Davey Lab, University Pk, PA 16802 USA 4.Xiamen Univ, Dept Astron, Xiamen 361005, Peoples R China 5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 6.Xiamen Univ, SHAO XMU Joint Ctr Astrophys, Xiamen 361005, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cai, ZhenYi,Sun, YuHan,Wang, JunXian,et al. New clues to jet launching: The inner disks in radio loud quasars may be more stable[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2019,62(6):14. |
| APA | Cai, ZhenYi,Sun, YuHan,Wang, JunXian,Zhu, FeiFan,Gu, WeiMin,&Yuan, Feng.(2019).New clues to jet launching: The inner disks in radio loud quasars may be more stable.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,62(6),14. |
| MLA | Cai, ZhenYi,et al."New clues to jet launching: The inner disks in radio loud quasars may be more stable".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 62.6(2019):14. |
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来源：上海天文台
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