2001A&A...375..328N


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST18:05:59

2001A&A...375..328N - Astronomy and Astrophysics, volume 375, 328-337 (2001/8-3)

Properties of photoionized gas in accretion-powered sources.

NAKAYAMA M. and MASAI K.

Abstract (from CDS):

The UV/X-ray irradiated gas around a compact object was studied by solving the hydrostatic balance coupling with the ionization and thermal balances to obtain the structure over the accretion disk. The gas is ionized and heated by the strong radiation from the compact source, and becomes a recombining plasma; the kinetic energy of the particles is much lower than the energy of the ionization state. The characteristic thermal properties significantly affect the cooling rate, and consequently the structure of the gas. Under gravitation due to the compact object, the structure of the gas is classified into three distinct regimes: (I) a dynamically stable region of high temperature, (II) a stable region of low temperature, and (III) an unstable two-phase region of intermediate temperature. We found that the stability condition dT/dΞ>0 does not simply apply to the photoionized gas under gravity, where T is the gas temperature and Ξ is the ratio of the radiation pressure to the gas pressure. Regions I and II are located in that order from the central source toward the outer disk, and region III forms at the interface between the two stable regions. The two phases of high and low temperatures in region III could be smeared marginally by electron conduction, but the dynamically unstable part likely remains at the temperature of kT∼100eV. This characteristic temperature appears purely due to atomic processes and is independent of the source parameters such as the mass or the luminosity of the system. This temperature is of critical importance to the ionization state and radiation mechanisms in the gas. The line-like narrow recombination continua and recombination-cascade lines dominate in the region below ∼100eV, while the featureless free-free continuum dominates the radiation spectrum in the region of higher temperatures. These properties are widely true of accretion-powered sources, from stellar-mass systems like X-ray binaries to massive systems like active galactic nuclei, and should be taken into account for the gas dynamics of the accretion flows.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - instabilities - radiation mechanisms: non-thermal - stars binaries: close - galaxies: active

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 - 2020
#notes
1 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1778 2

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST18:05:59

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


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 (1FGL,2FGL,...), HXB (Ref,2013ApJS..209...14K), HX? (Ref), WR* (WR), V* (V*), IR (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 12.5 [ 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) :
079.84548 +00.70005 [ 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
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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 (38) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

X Cyg X-3 GPS 2030+407 PBC J2032.4+4057 WR 145a
3A 2030+407 GPSR 079.846+0.700 RGB J2032+409 1XRS 20305+407
2E 4376 GT 2030+407 RX J2032.3+4057 [AAA2018] FGL J2032.1+4058
2E 2030.5+4047 1H 2030+407 1RXS J203226.2+405725 [BM83] X2030+407
ECX6-23 H 2030+407 SWIFT J2032.5+4055 [BSF97] J203225.77+405728.0
1ES 2030+40.7 INTEGRAL1 118 SWIFT J2032.4+4057 [FS2003] 1076
1FGL J2032.4+4057 1M 2030+407 2U 2030+40 [KRL2007b] 376
2FGL J2032.1+4049 2MASS J20322578+4057279 3U 2030+40 [WBC2013] J203225.6+405726
GB6 B2030+4047 18P 57 4U 2030+40
87GB 203037.0+404726 19P 17 V* V1521 Cyg

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References (1778 between 1850 and 2020) (Total 1778)
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


ISO : 30    XMM : 3    herschel : 4   

   


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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2020.10.24-18:05:59

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