We fit outbursts of two X-ray novae (Nova Monocerotis 1975 = A 0620–00 and Nova Muscae 1991 = GS 1124–683) using a time-dependent accretion disk model. The model is based on a new solution for a diffusion-type equation for the non-steady-state accretion and describes the evolution of a viscous α–disk in a binary system after the peak of an outburst, when matter in the disk is totally ionized. T...

We report on the results of spectral fits made to a NuSTAR observation of the black hole GRS 1915+105 in a “plateau” state. This state is of special interest because it is similar to the “low/hard” state seen in other black holes, especially in that compact, steady jets are launched in this phase. The 3–79 keV bandpass of NuSTAR, and its ability to obtain moderate–resolution spectra free from d...

M32 is the prototype for the relatively rare class of galaxies referred to as compact ellipticals. It has been suggested that M32 may be a tidally disturbed r elliptical galaxy, or the remnant bulge of a disk-stripped early-type spiral galaxy. This paper reveals that the surface brightness profile, the velocity dispersion measurements, and the estimated supermassive black hole mass in M32 are i...

A holographic optical element (HOE) is a kind of diffractive optical element. It can replace an optical system with multiple optical components such as lenses, mirrors, beamsplitters, and prisms. Thus, it is expected to be possible improve performance and reduce the number of optical parts of various optical systems, such as optical storage systems 1) like compact disk or digital versatile disk...

A function theoretic characterization is given of when a composition operator is compact on BMOA, the space of analytic functions on the unit disk having radial limits that are of bounded mean oscillation on the unit circle. When the symbol of the composition operator is univalent, compactness on BMOA is shown to be equivalent to compactness on the Bloch space, and a characterization in terms o...

1. Introduction. An analytic disk in C n is a map f : D → C n , where D is the closed unit disk, which is holomorphic on the open disk D o and smooth up to the boundary. One can also consider disks that are not smooth at every point of bD. An H ∞-disk is a bounded holomorphic map f : D o → C n. One says that the boundary of f is contained in a compact set X ⊆ C n if the almost-everywhere define...