The Importance of Accretion Torques in Pulsing X-ray Sources
نویسندگان
چکیده
منابع مشابه
Modes of Accretion in X-ray Sources
Three classical modes of accretion are briefly discussed: wind-fed, spherical, and disk. The three modes are illustrated with the mass transfer onto black holes in high-mass X-ray binaries. Then a new regime of mini-disk accretion is described and it is argued that observed wind-fed X-ray sources are likely to accrete in this regime. Switching from one accretion mode to another can cause the ob...
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We present estimates for the accretion rates in 13 X–ray bursting sources which exhibit photospheric expansion, basing on theoretical models of stationary, radiatively driven winds from neutron stars. The relatively high values obtained, Ṁacc∼> 10 M⊙/yr, are in accordance with theoretical limits for unstable helium burning, and, at the same time, almost never exceed the “dynamical” limit for st...
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Soft, potentially thermal spectral components observed in some ULXs can be fit with models for emission from cool, optically-thick accretion disks. If that description is correct, the low temperatures that are observed imply accretion onto “intermediate-mass” black holes. Subsequent work has found that these components may follow an inverse relationship between luminosity and temperature, imply...
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The X-ray spectra of the most extreme ultra-luminous X-ray sources – those with L ≥ 1040 erg s−1 – remain something of a mystery. Spectral roll-over in the 5–10 keV band was originally detected in in the deepest XMM-Newton observations of the brightest sources; this is confirmed in subsequent NuSTAR spectra. This emission can be modeled via Comptonization, but with low electron temperatures (kT...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1976
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/174.1.25p