We compute a spectrum of parametric x-ray radiation inside crystal from bunch electrons, which is periodically modulated in density. consider that the electrons exiting an free-electron laser (XFEL) channel. demonstrate case resonance between frequency and modulation electron bunch, sequence strong quasimonochromatic pulses formed---superradiant emission (SPXE) with frequencies are multiples fr...

We report the first X-ray detection of the radio pulsar PSR B1757−24 using the Chandra X-ray Observatory. The image reveals point-source emission at the pulsar position, consistent with being magnetospheric emission from the pulsar. In addition, we detect a faint tail extending nearly 20 east of the pulsar, in the same direction and with comparable morphology to the pulsar’s well-studied radio ...

I report on a model for the broad-band emission from SNR J1713 including a consistent calculation of thermal X-ray emission together with non-thermal emission in a nonlinear diffusive shock acceleration (DSA) model (Ellison et al. 2010, ApJ). This model tracks the evolution of the SNR including the plasma ionization state between the forward shock and the contact discontinuity. We use a plasma ...

RXTE, GINGA, and OSSE observations have revealed an intense low-energy γ-ray continuum emission from the Galactic plane, which is commonly interpreted as evidence for the possible existence of a strong flux of low-energy cosmic ray electrons. In this Paper I discuss the scenario of a hadronic origin of the soft Galactic γ-ray continuum through inverse bremsstrahlung. A flux of low-energy cosmic...

We present the results from a Chandra observation of the powerful radio galaxy 3C 265. We detect X–ray emission from the nucleus, the radio hotspots and lobes. In particular, the lobe X–ray emission is well explained as anisotropic inverse Compton scattering of the nuclear photons by the relativistic electrons in the radio lobes; the comparison between radio synchrotron and IC emission yields a...