Search Publications
INTEGRAL observations of TeV plerions
Santangelo, A.; Horns, D.; Hoffmann, A. I. D.
Amongst the sources seen in very high gamma-rays several are associated with Pulsar Wind Nebulae ("TeV plerions"). The study of hard X-ray/soft gamma-ray emission is providing an important insight into the energetic particle population present in these objects. The unpulsed emission from pulsar/pulsar wind nebula systems in the energy range access…
Evidence for a binary companion to the central compact object 1E 1207.4-5209
Pavlov, George G.; Zavlin, Vyacheslav E.; Woods, Peter M.
Unique among neutron stars, 1E 1207.4-5209 is an X-ray pulsar with a spin period of 424 ms that contains at least two strong absorption features in its energy spectrum. This neutron star is positionally coincident with the supernova remnant PKS 1209-51/52 and has been identified as a member of the growing class of radio-quiet compact central objec…
XMM-Newton observations of the isolated neutron star 1RXS J214303.7+065419/RBS1774
Cropper, Mark; Turolla, Roberto; Zampieri, Luca +4 more
We report XMM-Newton observations of the isolated neutron star RBS1774 and confirm its membership as an XDINS. The X-ray spectrum is best fit with an absorbed blackbody with temperature kT=101 eV and absorption edge at 0.7 keV. No power law component is required. An absorption feature in the RGS data at 0.4 keV is not evident in the EPIC data, but…
The black-hole candidate XTE J1817-330 as seen by XMM-Newton and INTEGRAL
Haberl, Frank; Greiner, Jochen; Sala, Gloria +1 more
The new black hole candidate XTE J1817-330, discovered on 26 January 2006 with RXTE, was observed with XMM-Newton and INTEGRAL in February and March 2006, respectively. The X-ray spectrum is dominated by the thermal emission of the accretion disk in the soft band, with a low absorption column density (NH=1.77(±0.01)×1021 cm
PSR J1119–6127 and the X-ray emission from high magnetic field radio pulsars
Camilo, F.; Gaensler, B. M.; Gonzalez, M. E. +2 more
The existence of radio pulsars having inferred magnetic fields in the magnetar regime suggests that possible transition objects could be found in the radio pulsar population. The discovery of such an object would contribute greatly to our understanding of neutron star physics. Here we report on unusual X-ray emission detected from the radio pulsar…
Jet disc coupling in black hole binaries
Malzac, Julien
In the last decade multi-wavelength observations have demonstrated the importance of jets in the energy output of accreting black hole binaries. The observed correlations between the presence of a jet and the state of the accretion flow provide important information on the coupling between accretion and ejection processes. After a brief review of …
QED can explain the non-thermal emission from SGRs and AXPs: variability
Heyl, Jeremy S.
Owing to effects arising from quantum electrodynamics (QED), magnetohydrodynamical fast modes of sufficient strength will break down to form electron-positron pairs while traversing the magnetospheres of strongly magnetised neutron stars. The bulk of the energy of the fast mode fuels the development of an electron-positron fireball. However, a sma…
INTEGRAL serendipitous detection of the gamma-ray microquasar LS 5039
Goldoni, P.; Di Salvo, T.; Rupen, M. +3 more
LS 5039 is the only X-ray binary persistently detected at TeV energies by the Cherenkov HESS telescope. It is moreover a γ-ray emitter in the GeV and possibly MeV energy ranges. To understand important aspects of jet physics, like the magnetic field content or particle acceleration, and emission processes, such as synchrotron and inverse Compton (…
Towards self-consistent models of isolated neutron stars: The case of the X-ray pulsar RX J0720-3125
Miniutti, G.; Pons, J. A.; Pérez-Azorín, J. F. +1 more
We propose a self–consistent model to explain all observational properties reported so far on the isolated neutron star (INS) RX J0720-3125 with the aim of giving a step forward towards our understanding of INSs. For a given magnetic field structure, which is mostly confined to the crust and outer layers, we obtain theoretical models and spectra w…
RETRACTED ARTICLE: X-ray observations of PSR B0355+54 and its pulsar wind nebula
Cropper, Mark; Zane, Silvia; Vestrand, W. Thomas +3 more
We present X-ray data of the middle-aged radio pulsar PSR B0355+54. The XMM-Newton and Chandra observations show not only emission from the pulsar itself, but also compact diffuse emission extending ∼50″ in the opposite direction to the pulsar's proper motion. Our analysis also indicates the presence of fainter diffuse emission extending ∼5' from …