2021A&A...654A..81C

Query : 2021A&A...654A..81C

2021A&A...654A..81C - Astronomy and Astrophysics, volume 654A, 81-81 (2021/10-1)

Magnetic accretion disk-outflow model for the state transition in X-ray binaries.

CAO X., YOU B. and YAN Z.

Abstract (from CDS):


Context. 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 α of the neutron star XRBs are systematically higher for those of the black hole (BH) XRBs (α∼0.05-0.15 for BHs, and α∼0.15-0.4 for neutron stars). Our model predicts that the transition luminosity may be higher than the peak luminosity provided α is sufficiently high, which is able to explain a substantial fraction of outbursts in BHXRBs that do not reach the thermally dominant accretion state.

Abstract Copyright: © ESO 2021

Journal keyword(s): accretion, accretion disks - magnetic fields - black hole physics - binaries: general - X-rays: binaries - ISM: jets and outflows

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1942 2

Query : 2021A&A...654A..81C

Basic data :
V* V1521 Cyg -- High Mass X-ray Binary
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		X (X,3A,...), Rad (ECX6,GB6,...), gam (2AGL,1FGL,...), HXB (2013ApJS), WR* (WR), HX? (2016ApJS), Q? (2021MNRAS), V* (V*), NIR (2MASS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		20 32 25.78 +40 57 27.9 (Infrared) [ 60 60 90 ] C 2003yCat.2246....0C
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		20 30 37.63 +40 47 12.6 [ 60 60 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		079.84549 +00.70006 [ 60 60 90 ]
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type: 		WN4/5-6/7 C 1996A&A...314..521V
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (3) :
J 15.309 [0.059] C 2003yCat.2246....0C
H 13.192 [0.057] C 2003yCat.2246....0C
K 11.921 [0.031] C 2003yCat.2246....0C
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
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Some important notes on this object about identifications and objects associations.
notes:

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (41) :
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X Cyg X-3 87GB 203037.0+404726 PBC J2032.4+4057 WR 145a
3A 2030+407 GPS 2030+407 RGB J2032+409 1XRS 20305+407
2AGL J2033+4100 GPSR 079.846+0.700 RX J2032.3+4057 [AAA2018] FGL J2032.1+4058
2E 4376 GT 2030+407 1RXS J203226.2+405725 [BM83] X2030+407
2E 2030.5+4047 1H 2030+407 SWIFT J2032.5+4055 [BSF97] J203225.77+405728.0
ECX6-23 H 2030+407 SWIFT J2032.4+4057 [FS2003] 1076
1ES 2030+40.7 INTEGRAL1 118 TIC 17032547 [KRL2007b] 376
1FGL J2032.4+4057 1M 2030+407 2U 2030+40 [WBC2013] J203225.6+405726
2FGL J2032.1+4049 2MASS J20322578+4057279 3U 2030+40
4FGL J2032.6+4053 18P 57 4U 2030+40
GB6 B2030+4047 19P 17 V* V1521 Cyg

References (1942 between 1850 and 2024) (Total 1942)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


distance : 1    MK : 1   

   

Observing logs


herschel : 4    ISO : 30    XMM : 3   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : V* V1521 Cyg

Link by name to the catalogue in VizieR :

2E 4376 2MASS J20322578+4057279 1RXS J203226.2+405725 V* V1521 Cyg

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Indications mainly about references on other documents
Notes (1) :

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