NAOC Open IR
New clues to jet launching: The inner disks in radio loud quasars may be more stable
Cai ZhenYi1; Sun YuHan1; Wang JunXian1; Zhu FeiFan1; Gu WeiMin3; Yuan Feng4
2019
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
ISSN1674-7348
Volume62Issue:6
AbstractJet 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.
KeywordOPTICAL VARIABILITY PROPERTIES DIGITAL SKY SURVEY BLACK-HOLE MASS X-RAY ACCRETION ENERGY QUIET LUMINOSITY CONTINUUM SELECTION accretion and accretion disks quasars galactic jets
Language英语
Funding Project[National Basic Research Program of China] ; [National Natural Science Foundation of China] ; [Chinese Top-notch Young Talents Program, and Frontier Science Key Research Program, China Academy Sciences] ; [Fundamental Research Funds for the Central Universities] ; [Ministry of Science and Technology of China]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/66666
Collection中国科学院国家天文台
Affiliation1.中国科学技术大学
2.University Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.厦门大学
4.中国科学院国家天文台
Recommended Citation
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).
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).
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).
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