Search Publications
The Role of XMM–Newton in the Investigation of Persistent BeXRBs
Mereghetti, Sandro; Esposito, Paolo; Israel, Gian Luca +2 more
The persistent BeXRBs are a class of high-mass X-ray binaries (HMXRBs), which are characterized by persistent low X-ray luminosities ($$ {L}_{\mathrm{X}}\sim {10}^{34} $$ erg s$$ {}^{-1} $$) and wide ($$ {P}_{\mathrm{orb}}> $$ 30 days), almost circular orbits. In these sources the NS is slowly rotating (with $$ {P}_{\mathrm{spin}} $$ well above…
INTEGRAL Observations of Magnetars
Mereghetti, Sandro; Ducci, Lorenzo; Pacholski, Dominik Patryk +1 more
The INTEGRAL satellite has collected a large amount of data on magnetars in our Galaxy, spanning more than 20 years starting from 2003. The large data set obtained with the IBIS/ISGRI instrument at energies above 20 keV allows us to study both the properties and long-term evolution of their persistent hard X-ray emission and the population charact…
Variability in high‑mass X‑ray binaries
Wilms, J.; Pottschmidt, K.; Grinberg, V. +5 more
Strongly magnetized, accreting neutron stars show periodic and aperiodic variability over a wide range of time scales. By obtaining spectral and timing information on these different time scales, we can have a closer look into the physics of accretion close to the neutron star and the properties of the accreted material. One of the most prominent …
η Carinae: Particle acceleration and multimessenger aspects
Walter, R.; Balbo, M.
η Carinae is composed of two very massive stars orbiting each other in 5.5 years. The primary star features the densest known stellar wind, colliding with that expelled by its companion. The wind collision region dissipates energy and accelerates particles up to relativistic energies, producing nonthermal X‑ray and γ‑ray emission detected by Beppo…
Spectral components in black hole X-ray binaries
Malzac, J.
This paper summarises our current understanding of the spectral continuum components observed in black hole X-ray binaries. The consequences for theoretical models are discussed with an emphasis on the constraints set by observations on the nature of the X-ray corona in different spectral states.
The peculiar megamaser AGN NGC 1194: Comparison with the warped disk candidates NGC 1068 and NGC 4258
Vasylenko, A.; Fedorova , E.; Hnatyk, B. I. +1 more
We analyze the X-ray properties of the Compton-thick Seyfert 1.9 radio quiet AGN in NGC 1194 using INTEGRAL (ISGRI), XMM-Newton (EPIC), Swift (BAT and XRT), and Suzaku (XIS) observations. There is a set of Fe-K lines in the NGC 1194 spectrum with complex relativistic profiles that can be considered as a sign of either a warped Bardeen-Petterson ac…
Gamma rays from a supernova of type Ia: SN2014J
Diehl, R.
SN2014J is the closest supernova of type Ia that occurred in the last 40 years. This provides an opportunity for unprecedented observational detail and coverage in many astronomical bands, which will help to better understand the still unknown astrophysics of these supernovae. For the first time, such an event occurs sufficiently nearby so that al…
Inverse Compton origin of pulsar γ-ray emission and the reconnection model of Crab Nebula flares
Lyutikov, M.
There is growing evidence that the pulsar high-energy emission is generated by the inverse Compton effect. The particles producing the Crab nebula flares, and possibly most of the Crab Nebula's high-energy emission, are accelerated by reconnection events, and not by a shock according to the Fermi mechanism.
High energy emission from AGN cocoons in clusters of galaxies
Nagai, H.; Kawakatu, N.; Kino, M. +1 more
Gamma-ray emission from cocoons of young radio galaxies is predicted. Considering the process of adiabatic injection of the shock dissipation energy and mass of the relativistic jet into the cocoon, we find that the thermal electron temperature of the cocoon is typically predicted to be of the order of ∼MeV, and is determined only by the bulk Lore…
XMM-Newton operations beyond the 10-year design lifetime
Parmar, A. N.; Schartel, N.; Metcalfe, L. +2 more
In preparation for XMM-Newton operations beyond the 10-year design lifetime ESA instigated an independent review of all aspects of the mission. Unsurprisingly, the review found that the scientific interest in extending the mission is very high and likely to remain so in the foreseeable future. Most importantly, all the elements of the XMM-Newton m…