We detect a weak unidentified emission line at E = (3.55 3.57) ± 0.03 keV in a stacked XMMspectrum of 73 galaxy clusters spanning a redshift range 0.01 0.35. MOS and PN observationsindependently show the presence of the line at consistent energies. When the full sample is dividedinto three subsamples (Perseus, Centaurus+Ophiuchus+Coma, and all others), the line is seen at> 3...

We report on Chandra ACIS imaging of the pulsar wind nebula (PWN) of the young Vela-like PSR B1706−44, which shows the now common pattern of an equatorial wind and polar jets. The structure is particularly rich, showing a relativistically boosted termination shock, jets with strong confinement, a surrounding radio/X-ray PWN and evidence for a quasi-static ‘bubble nebula’. The structures trace t...

We study the contribution of an active region and its core to the luminosity and the spectrum of the Sun in the X-ray band and to the relevant solar emission measure vs. temperature distribution, EM(T ). We also study the relevant changes in the course of four solar rotations, and the solar rotational modulation due to this active region, the only one present at that time. To this end, we have ...

X-ray binaries in the Milky Way are among the brightest objects on the Xray sky. With the increasing sensitivity of recent missions, it is now possible to study X-ray binaries in nearby galaxies. We present data on six luminous sources in the nearby spiral galaxy, M101, obtained with the Chandra ACIS-S. Of these, five appear to be similar to ultraluminous sources in other galaxies, while the br...

A new staged acid corrosion inhibition (ACI) concept, utilising polymerisable ACIs, has been developed to minimise the of coiled tubing and wellbore casing materials during matrix acidizing operations. The concept evaluated using a customised once-through flow cell 4 molar hydrochloric at 80 °C. high quality, protective inhibitor film is established an elevated ACI concentration test period 0–1...

We present initial follow-up results of the ELAIS Deep X-ray Survey which is being undertaken with the Chandra and XMM-Newton Observatories. 235 X-ray sources are detected in our two 75 ks ACIS-I observations in the well-studied ELAIS N1 and N2 areas. 90% of the X-ray sources are identified optically to R = 26 with a median magnitude of R = 24. We show that objects which are unresolved opticall...