Aims. PSR J1846−0258 is a young rotation-powered pulsar with one of the highest surface magnetic field strengths, located in the centre of SN-remnant Kes-75. In June 2006 a magnetar-like outburst took place. Using multi-year RXTE and INTEGRAL observations covering also the epoch of the outburst we aim to study the temporal and spectral characterisitics of PSR J1846−0258 over a broad ∼ 3-300 keV...

The law of gas initial desorption from coals is greatly important for understanding the occurrence mechanism and predicting coal outburst (hereinafter referred to as ‘outburst’). However, dynamic characterization remains be investigated. In this study, by monitoring pressure temperature tectonically deformed (TD) primary-undeformed (PU) coal, we established evolution laws key parameters during ...

We present results from a 100 ks XMM-Newton observation of the hot gas in the Virgo cluster elliptical galaxy NGC 4472. We find a surface brightness discontinuity ∼21 kpc north of the nucleus, consistent with being a contact discontinuity between two moving fluids. We also detect a >60 kpc long ram-pressure stripped tail. The pressure across the discontinuity implies an infall velocity, vinfall...

The process that prevents the deposition of cooled gas in cooling flows must rely on feedback in order to maintain gas with short cooling times, while preventing the bulk of the gas from cooling to low temperatures. The primary candidate for the feedback mechanism is the accretion of cooled and cooling gas by an active galactic nucleus (AGN). Despite some difficulties with this model, the high ...

During the observation of the Galactic-center field by the INTEGRAL observatory on September 9, 2003, the IBIS/ISGRI gamma-ray telescope detected a short (several-hourslong) intense (∼ 380 mCrab at the peak) outburst of hard radiation from the X-ray transient SAXJ1818.6-1703. Previously, this source was observed only once in 1998 during a similar short outburst. We present the results of our lo...

We examine in detail several aspects of the physics of accretion disks of possible relevance to the outburst mechanism of the black hole X-ray transients. We adopt the one dimensional, time dependent model described in detail by Cannizzo, Chen, & Livio with parameters appropriate for a system such as A0620-00. We investigate (1) the effect of the grid spacing, utilizing a logarithmic radial spa...

We model the interaction of the supernova SN 1995G with a dense circum-stellar (CS) gas in a thin shell approximation. A model fit of the observed bolometric light curve combined with data on the supernova expansion velocity provides an estimate of the density of the CS shell, its mass (≈ 1 M ⊙), and age (≈ 8 years). It is shown that the derived CS gas density does not depend on the assumed mas...

II Zw 71 (UGC 9562) was classified as a " probable " polar-ring galaxy in the Polar-Ring Catalog ((Whitmore et al. 1990)), based upon its optical appearance. We present 21 cm and optical observations of this galaxy and its companion, the blue star-forming dwarf II Zw 70. Our 21 cm observations show that 5 × 10 8 solar masses of H I is present in a polar ring orbiting II Zw 71, and show a spatia...

We present data from different epochs in 1978, 1987–1991 and 1996 from the black-hole candidate 4U1630−47. For the first time we present almost complete coverage of the outbursts which started in 1987, 1988, and 1996. We find that the outburst behaviour of 4U 1630−47 is more complex than previously realized. The source shows outbursts with durations on the order of ∼100-200 days and sometimes i...