We report results of an 18 ks exposure with the ACIS instrument on Chandra of the powerful z = 0.62 radio galaxy 3C 220.1. The X-ray emission separates into cluster gas of emission-weighted kT ∼ 5 keV and 0.7-12 keV luminosity (to a radius of 45 arcsec) 5.6 × 10 44 ergs s −1 , and unresolved emission (coincident with the radio core). While the extended X-ray emission is clearly thermal in natur...

There is good evidence for X-ray emission associated with AGN jets which are relativistically boosted towards the observer. But to what jet radius does such X-ray emission persist? To attempt to answer this question one can look at radio galaxies; their cores are sufficiently X-ray faint that any unbeamed X-ray emission in the vicinity of the central engine must be obscured. The jets of such so...

We report the discovery of spatially-extended, non-thermal or hot, quasi-thermal emission components in Chandra X-ray spectra for five of a sample of seven massive, merging galaxy clusters with powerful radio halos: Abell 665, 2163, 2255, 2319, and 1E 065756. The emission components can be fitted by power-law models with mean photon indices in the range 1.4 < Γ < 2.0, or by bremsstrahlung emiss...

We present a detailed analysis of the complex soft X-ray spectrum of NGC 4151 measured by the RGS instruments aboard XMM-Newton. The XMM-Newton RGS spectra demonstrate that the soft X-ray emission is extremely rich in X-ray emission lines and radiative recombination continua (RRC), with no clear evidence for any underlying continuum emission. Line emission, and the associated RRC, are clearly d...

France Received ; accepted – 2 – ABSTRACT In this paper, the correlation between the γ-ray and the radio bands is investigated. The results show that there is a closer correlation between the γ-ray emission and the high frequency (1.3mm, 230GHz) radio emission for maximum data than between the γ-ray and the lower frequency (5GHz) radio emissions, which means that the γ-ray is associated with th...

We present a simple analytic model for the various contributions to the non-thermal emission from shell type SNRs, and show that this model’s results reproduce well the results of previous detailed calculations. We show that the ≥ 1 TeV gamma ray emission from the shell type SNRs RX J1713.7-3946 and RX J0852.04622 is dominated by inverse-Compton scattering of CMB photons (and possibly infra-red...

We present the first high resolution X-ray image of the jet in M 87 using the Chandra X-ray Observatory. There is clear structure in the jet and almost all of the optically bright knots are detected individually. The unresolved core is the brightest X-ray feature but is only 2-3 times brighter than knot A (12.3 ′′ from the core) and the inner knot HST-1 (1.0 ′′ from the core). The X-ray and opt...

The X-ray emission characteristics of a vacuum spark device operated with anode materials of various atomic numbers were studied. The temporal evolution of the X-ray emission was recorded by using five channels of high-speed PIN X-ray diodes. A time-integrated X-ray spectrometer was used to record the spectral distribution of the X-ray emission. The electron temperatures of the aluminium, coppe...

This work reports on the detection of γ-ray emission coincident with the supernova remnant (SNR) G5.7–0.1 using data collected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The SNR is believed to be interacting with molecular clouds, based on 1720MHz hydroxyl (OH) maser emission observations in its direction. This interaction is expected to provide targets for the pr...