منابع مشابه
Geometrical beaming of stellar mass ULXs
The presence or lack of eclipses in the X-ray light curves of ultraluminous X-ray sources (ULXs) can be directly linked to the accreting system geometry. In the case where the compact object is stellar mass and radiates isotropically, we should expect eclipses by a main-sequence to sub-giant secondary star on the recurrence time-scale of hours to days. X-ray light curves are now available for l...
متن کاملA Comparison of Intermediate Mass Black Hole Candidate Ulxs and Stellar-mass Black Holes
Cool thermal emission components have recently been revealed in the X-ray spectra of a small number of ultraluminous X-ray (ULX) sources with LX ≥ 1040 erg/s in nearby galaxies. These components can be well fitted with accretion disk models, with temperatures approximately 5–10 times lower than disk temperatures measured in stellar-mass Galactic black holes when observed in their brightest stat...
متن کاملObservational studies of stellar black hole binaries and ULXs
We outline a framework for understanding the X-ray spectra of high mass accretion rate stellar black holes based on X-ray data from RXTE and ASCA. Three spectral regimes can be separated out by the behaviour of the observed disk luminosity and temperature. The well established ”standard regime” is seen when the disk dominates the spectrum, where only a small fraction of the luminosity is emitte...
متن کاملMasses, Beaming and Eddington Ratios in Ultraluminous X–ray Sources
I suggest that the beaming factor in bright ULXs varies as b ∝ ṁ, where ṁ is the Eddington ratio for accretion. This is required by the observed universal Lsoft ∝ T −4 relation between soft–excess luminosity and temperature, and is reasonable on general physical grounds. The beam scaling means that all observable properties of bright ULXs depend essentially only on the Eddington ratio ṁ, and th...
متن کاملThe Stellar Mass Function
Since the major review by Scalo (1986), significant progress has been achieved in constraining the mass function (MF) of low-mass stars. The break-throughs which today allow a much better understanding of the stellar luminosity function (LF) and the underlying MF are documented here and the resulting MF for Galactic field stars is confronted with microlensing data, the chemical enrichment histo...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society: Letters
سال: 2016
ISSN: 1745-3925,1745-3933
DOI: 10.1093/mnrasl/slw128