Search Publications
Impact effects from small size meteoroids and space debris
Drolshagen, Gerhard
When the impact risk from meteoroids and orbital debris is assessed the main concern is usually structural damage. With their high impact velocities of typically 10 20 km/s millimeter or centimeter sized objects can puncture pressure vessels and other walls or lead to destruction of complete subsystems or even whole spacecraft. Fortunately chances…
Supernova remnants with magnetars: Clues to magnetar formation
Vink, Jacco
In this paper I discuss the lack of observational evidence that magnetars are formed as rapidly rotating neutron stars. Supernova remnants containing magnetars do not show the excess of kinetic energy expected for such a formation scenario, nor is there any evidence for a relic pulsar wind nebula. However, it could be that magnetars are formed wit…
A physical interpretation of the jet-like X-ray emission from supernova remnant W49B
Ballet, J.; Miceli, M.; Bocchino, F. +4 more
In the framework of the study of supernova remnants and their complex interaction with the interstellar medium and the circumstellar material, we focus on the galactic supernova remnant W49B. Its morphology exhibits an X-ray bright elongated nebula, terminated on its eastern end by a sharp perpendicular structure aligned with the radio shell. The …
XMM-Newton temperature maps for five intermediate redshift clusters of galaxies
Durret, Florence; Lima Neto, Gastão B.
We have analyzed XMM-Newton archive data for five clusters of galaxies (redshifts 0.223 0.313) covering a wide range of dynamical states, from relaxed objects to clusters undergoing several mergers. We present here temperature maps of the X-ray gas together with a preliminary interpretation of the formation history of these clusters.
X-ray study of accretion flow in narrow-line Seyfert 1 galaxies
Terashima, Y.; Haba, Y.; Kunieda, H. +1 more
We present the results of a systematic study of narrow-line Seyfert 1 galaxies (NLS1s) observed with XMM-Newton. The 2 12 keV X-ray spectra of NLS1s are well represented by a single power law with a photon index Γ ∼ 2. When this hard power law continuum is extrapolated into the low energy band, we found that all objects in our sample show prominen…
XMM-Newton observations across the Cygnus Loop from northeastern rim to southwestern rim
Katsuda, Satoru; Tsunemi, Hiroshi
We have observed the Cygnus Loop from the northeast (NE) to the southwest (SW) with XMM-Newton. We extracted spectra from 3‧-spaced annular regions across the Loop and fitted them either with a one-kTe-component non-equilibrium ionization (NEI) model or with two-kTe-component NEI model. We found that the two-kTe-co…
Observational appearances of isolated stellar-mass black hole accretion Theory and observations
Karpov, S.; Beskin, G.; Biryukov, A. +2 more
General properties of accretion onto isolated stellar-mass black holes in the Galaxy are discussed. An analysis of plasma internal energy growth during the infall is performed. Adiabatic heating of collisionless accretion flow due to magnetic adiabatic invariant conservation is 25% more efficient than in the standard non-magnetized gas case. It is…
INTEGRAL observations of the SNR IC443 region
Bocchino, F.; Kretschmar, P.; Bykov, A. M. +3 more
IC433 is a supernova remnant (SNR) interacting with a molecular cloud. The field of IC443 also contains an unidentified gamma-ray source 3EG J0617 + 2238. Recent observations with XMM-Newton and Chandra have revealed a number of hard X-ray sources in the field of the extended SNR including a pulsar wind nebula and an enigmatic hard X-ray source in…
XMM-Newton survey of non-thermal shell candidates: Preliminary results on DA 530
Bocchino, F.; Gallant, Y.; Bandiera, R.
The investigation of the general properties of non-thermal (NT) X-ray shell supernova remnants (SNRs), of which SN 1006 is the prototype, is important to understand how electrons are accelerated in SNR shocks and what is the origin of cosmic rays. Using the XMM-Newton satellite, we are carrying on a survey of putative non-thermal SNR candidates pr…
Catalogue of ionized emission line spectra in obscured AGN
Bianchi, S.; Guainazzi, M.; Salgado, J. +2 more
High-energy, high-resolution in the spatial and energy domains is crucial to derive the geometrical distribution and the physical properties of gas and dust surrounding Active Galactic Nuclei (AGN). These are, in turn, basic ingredients of any serious attempt to build an AGN structure model. We present in this paper CIELO-AGN, the first catalogue …