Search Publications
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RETRACTED ARTICLE: X-ray observations of PSR B0355+54 and its pulsar wind nebula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 …
Morphologies of AGN host galaxies using HST/ACS in the CDFS-GOODS field
Hasan, Priya
Using HST/ACS images in four bands F435W, F606W, F775W and F850LP, we identify optical counterparts to the X-ray sources in the Chandra Deep Field South in the GOODS South field. A detailed study has been made of these sources to study their morphological types. We use methods like decomposition of galaxy luminosity profiles, color maps and visual…
Long term spectral variability in the soft gamma-ray repeater SGR 1900+14
Mereghetti, Sandro; Esposito, Paolo; Turolla, Roberto +8 more
We present a systematic analysis of all the BeppoSAX data of SGR1900+14. The observations spanning five years show that the source was brighter than usual on two occasions: ∼20 days after the August 1998 giant flare and during the 105 s long X-ray afterglow following the April 2001 intermediate flare. In the latter case, we explore the …
Thin magnetic hydrogen atmospheres and the neutron star RX J1856.5–3754
Ho, Wynn C. G.; Kaplan, David L.; Chang, Philip +2 more
RX J1856.5–3754 is one of the brightest nearby isolated neutron stars, and considerable observational resources have been devoted to it. However, current models are unable to satisfactorily explain the data. We show that our latest models of a thin, magnetic, partially ionized hydrogen atmosphere on top of a condensed surface can fit the entire sp…
Hard X-ray emission from the SNR G337.2+0.1
Albacete Colombo, Juan F.; Benaglia, Paula; Combi, Jorge A. +1 more
We report hard X-ray emission of the non-thermal supernova remnant G337.2+0.1. The source presents centrally filled and diffuse X-ray emission. A spectral study confirms that the column density of the central part of the object is about NH∼5.9(±1.5)×1022 cm‑2 and its X-ray spectrum is well represented by a single p…