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A Deep Search with the Hubble Space Telescope for Late-Time Supernova Signatures in the Hosts of XRF 011030 and XRF 020427
Wood-Vasey, W. Michael; Ramirez-Ruiz, Enrico; Tanvir, Nial +16 more
X-ray flashes (XRFs) are, like gamma-ray bursts (GRBs), thought to signal the collapse of massive stars in distant galaxies. Many models posit that the isotropic equivalent energies of XRFs are lower than those for GRBs, such that they are visible from a reduced range of distances when compared with GRBs. Here we present the results of two-epoch H…
Filaments as Possible Signatures of Magnetic Field Structure in Planetary Nebulae
Huggins, P. J.; Manley, S. P.
We draw attention to the extreme filamentary structures seen in high-resolution optical images of certain planetary nebulae. We determine the physical properties of the filaments in the nebulae IC 418, NGC 3132, and NGC 6537, and based on their large length-to-width ratios, longitudinal coherence, and morphology, we suggest that they may be signat…
Cascades of shocks in active galactic nuclei and their radiation
Courvoisier, T. J. -L.; Türler, M.
We discuss accretion flows on massive black holes in which different elements of the flow (clumps) have velocities that may differ substantially. We estimate the consequence of collisions between these clumps as they come close to the central object and calculate the resulting radiation. We show that this radiation is similar to that observed in t…
The STAFF-DWP wave instrument on the DSP equatorial spacecraft: description and first results
Belmont, G.; Bouzid, V.; Santolík, O. +13 more
The STAFF-DWP wave instrument on board the equatorial spacecraft (TC1) of the Double Star Project consists of a combination of 2 instruments which are a heritage of the Cluster mission: the Spatio-Temporal Analysis of Field Fluctuations (STAFF) experiment and the Digital Wave-Processing experiment (DWP). On DSP-TC1 STAFF consists of a three-axis s…
Cluster at the Bow Shock: Introduction
Balogh, A.; Thomsen, M. F.; Lembège, B. +11 more
Constraints on the distribution of absorption in the X-ray-selected AGN population found in the 13HXMM-Newton/Chandra deep field
McHardy, I.; Page, M. J.; Sasseen, T. +4 more
We present an analysis of the X-ray properties of sources detected in the 13HXMM-Newton deep (200-ks) field. In order to constrain the absorbed active galactic nuclei (AGN) population, we use extensive Monte Carlo simulations to compare directly the X-ray colours of observed sources with those predicted by several model distributions. I…
Discovery of Optical Emission in the Hot Spots of Three 3CR Quasars: High-Energy Particle Acceleration in Powerful Radio Hot Spots
Cheung, C. C.; Wardle, J. F. C.; Chen, Tingdong
Archival Hubble Space Telescope WFPC2 images were used to search for optical emission associated with the radio jets of a number of luminous quasars. From this search, we report new optical hot spot detections in the well-known blazar 3C 454.3 and the lobe-dominated quasars 3C 275.1 and 3C 336. We also find optical emission in the vicinity of the …
Simultaneous XMM-Newton and ESO VLT observations of supernova 1995N: probing the wind-ejecta interaction
Turatto, M.; Cappellaro, E.; Benetti, S. +3 more
We present the results of the first XMM-Newton observation of the interacting Type IIn supernova 1995N, performed in 2003 July. We find that the 0.2-10.0 keV unabsorbed flux dropped to a value of ~=1.8 × 10-13ergcm-2s-1, almost one order of magnitude lower than that of a previous ASCA observation of 1998 January. F…
The symmetric dust shell and the central star of the bipolar planetary nebula NGC6537*†
Waters, L. B. F. M.; Zijlstra, A. A.; Gray, M. D. +2 more
We present high-resolution images of the strongly bipolar planetary nebula NGC6537, obtained with the Hubble Space Telescope (HST) and with the infrared adaptive optics system on the Very Large Telescope. The central star is detected for the first time. Using the multiband photometry and constraints from the dynamical age of the nebula, we derive …
Fourier-Resolved Spectroscopy of the XMM-Newton Observations of MCG -06-30-15
Papadakis, I. E.; Akylas, A.; Kazanas, Demosthenes
We study the frequency-resolved spectra of the Seyfert galaxy MCG -06-30-15 obtained during two recent XMM-Newton observations. Splitting the Fourier spectra in soft (E<~2 keV) and hard (E>~2 keV) bands, we find that the soft band has a variability amplitude larger than the hard one on timescales longer than 10 ks, while the opposite is true…