We have simultaneously fit Chandra and RXTE spectra of the Galactic black hole XTE J1118+480 with three models for X-ray reflection. We explored a range of accretion disc ionizations (log(ξ)=1–4; ξ = LX/nR) and iron abundances (0.10–1.00). Our fits with the constant density ionized disc models of Ross & Fabian indicate that≤0.5 per cent (90 per cent confidence upper-limit) of the observed flux ...

We discuss the formation and evolution of binaries which contain neutron stars or black holes. It is shown that in a stellar system which for 10 yr had star formation rate similar to the current one in the Galactic disc, the rate of neutron star mergers is ∼ 2 × 10 yr, consistent with the observational estimates. The rate of black hole and neutron star mergers is by an order of magnitude lower....

Observations of massive stars within the central parsec of the Galaxy show that, while most stars orbit within a well-defined disc, a significant fraction have large eccentricities and / or inclinations with respect to the disc plane. Here, we investigate whether this dynamically hot component could have arisen via scattering from an initially cold disc – the expected initial condition if the s...

purpose: to evaluate the relationship between central corneal thickness (cct) and optic disc area in patients with primary open angle glaucoma (poag). methods: the study was performed on patients with poag who were being followed at johns hopkins hospital. all patients underwent thorough eye examination, optic disc imaging with the heidelberg retina tomograph ii (hrt ii), and ultrasound corneal...

AIM The objective of the present study was to evaluate the effect of different denture base materials on the stress distribution in TMJ articular disc (AD) in complete denture wearers. MATERIAL AND METHODS A three dimensional Finite Element (FEA) models of an individual temporomandibular joint (TMJ) was built on the basis CT scan. The FEA model consisted of four parts: the condyle, the articu...

We discuss the role of thermal cyclo–synchrotron emission in a magnetically dominated corona above an accretion disk in an active galaxy or a galactic black hole candidate. The dissipation occurs in localized active regions around the central black hole. Cyclo– synchrotron radiation is found to be an important process. In the case of galactic black hole candidates, its emission can dominate the...

We study the half-light radius versus black hole mass as well luminosity relations in active galactic nuclei (AGN) when disc is illuminated by X-ray corona. used KYNSED, a recently developed spectral model for studying broadband energy distribution AGN. considered non-illuminated Novikov-Thorne discs and based on temperature radial profile. also case where profile modified colour-correction fac...

The shrinking of a binary orbit driven by the interaction with gaseous circumbinary disc, initially advocated as potential way to catalyze merger, has been recently debated in case geometrically thick (i.e. $H/R\gtrsim 0.1$) discs. However, clear consensus is still missing mainly owing numerical limitations, such fixed binaries or lack resolution inside cavity carved its disc. In this work, we ...

We present 18 years of high resolution and S/N Hα spectroscopy of the Be shell star o And, obtained between 1985–2002. Spectra taken during late 1985 show a pure photospheric profile, with disc re-formation commencing in 1986; a process that is found to occur over long timescales (∼103 days). Analysis of the evolution of the properties of the Hα shell profile suggest that the disc kinematics ar...