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Magnetic accretion disk-outflow model for the state transition in X-ray binaries
Cao, Xinwu1,2,3; You, Bei4,5; Yan, Zhen6,7
2021-10-14
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume654Pages:7
AbstractContext. The hard-to-soft state transition of the outbursts in X-ray binaries (XRBs) is triggered by the rising of the mass accretion rate as a result of the disk instability. The hard X-ray transition luminosity is found to be tightly correlated to the soft X-ray peak luminosity in the soft state, the physical origin of which is still a mystery. Aims. In order to explain the observed correlation between the hard X-ray transition luminosity and the soft X-ray peak luminosity in the soft state, we construct a magnetic disk-outflow model for the state transition in XRBs. Methods. We assumed that the large-scale magnetic field in the outer thin disk is formed through an inverse cascade of the field generated by the small-scale dynamo, which is then advected by the inner advection-dominated accretion flow (ADAF). The advected field accelerates a fraction of the gas in the ADAF into the outflows. We calculated the transition luminosity of an ADAF that is driven by these magnetic outflows, which vary with the mass accretion rate of the outer disk. Results. During the outbursts, the heating front moves inward, and the field strength at the heating front of the outer disk is proportional to the accretion rate of the disk. Much angular angular momentum of the inner ADAF is carried away by the outflows for a stronger magnetic field, which leads to a high radial velocity of the ADAF. This increases the critical mass accretion rate of the ADAF with the field strength, and it therefore leads to a correlation between transition luminosity and the peak luminosity in the thermal state. We found that the values of the viscosity parameter alpha of the neutron star XRBs are systematically higher for those of the black hole (BH) XRBs (alpha similar to 0.05-0.15 for BHs, and alpha similar to 0.15-0.4 for neutron stars). Our model predicts that the transition luminosity may be higher than the peak luminosity provided alpha is sufficiently high, which is able to explain a substantial fraction of outbursts in BHXRBs that do not reach the thermally dominant accretion state.
Keywordaccretion, accretion disks magnetic fields black hole physics binaries: general X-rays: binaries ISM: jets and outflows
Funding OrganizationNSFC ; NSFC ; China Manned Space Project ; China Manned Space Project ; CAS ; CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; NSFC ; NSFC ; China Manned Space Project ; China Manned Space Project ; CAS ; CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; NSFC ; NSFC ; China Manned Space Project ; China Manned Space Project ; CAS ; CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; NSFC ; NSFC ; China Manned Space Project ; China Manned Space Project ; CAS ; CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS
DOI10.1051/0004-6361/202141652
WOS KeywordADVECTION-DOMINATED ACCRETION ; BLACK-HOLES ; SOFT STATE ; LIGHT CURVES ; GX 339-4 ; MASS ; FIELD ; HYSTERESIS ; OUTBURSTS ; FLUX
Language英语
Funding ProjectNSFC[11773050] ; NSFC[11833007] ; NSFC[12073023] ; NSFC[11903024] ; NSFC[U1838103] ; NSFC[U1931203] ; NSFC[11773055] ; NSFC[U1838203] ; NSFC[U1938114] ; China Manned Space Project[CMS-CSST-2021-A06] ; CAS[QYZDJ-SSWSYS023] ; Youth Innovation Promotion Association of CAS[2020265]
Funding OrganizationNSFC ; NSFC ; China Manned Space Project ; China Manned Space Project ; CAS ; CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; NSFC ; NSFC ; China Manned Space Project ; China Manned Space Project ; CAS ; CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; NSFC ; NSFC ; China Manned Space Project ; China Manned Space Project ; CAS ; CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; NSFC ; NSFC ; China Manned Space Project ; China Manned Space Project ; CAS ; CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000707189400002
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/74517
Collection中国科学院国家天文台
Corresponding AuthorCao, Xinwu
Affiliation1.Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, 38 Zheda Rd, Hangzhou 310027, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
4.Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China
5.Wuhan Univ, Astron Ctr, Wuhan 430072, Peoples R China
6.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
7.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Cao, Xinwu,You, Bei,Yan, Zhen. Magnetic accretion disk-outflow model for the state transition in X-ray binaries[J]. ASTRONOMY & ASTROPHYSICS,2021,654:7.
APA Cao, Xinwu,You, Bei,&Yan, Zhen.(2021).Magnetic accretion disk-outflow model for the state transition in X-ray binaries.ASTRONOMY & ASTROPHYSICS,654,7.
MLA Cao, Xinwu,et al."Magnetic accretion disk-outflow model for the state transition in X-ray binaries".ASTRONOMY & ASTROPHYSICS 654(2021):7.
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