Search Publications
TeV light curve of PSR B1259-63/SS2883
Aharonian, F.; Khangulyan, D.; Hnatic, S. +1 more
The inverse Compton (IC) scattering of ultrarelativistic electrons accelerated at the pulsar wind termination shock is generally believed to be responsible for TeV gamma-ray signal recently reported from the binary system PSR B1259-63/SS2883. While this process can explain the energy spectrum of the observed TeV emission, the gamma-ray fluxes dete…
Very deep X-ray observations of the anomalous X-ray pulsar 4U0142+614
Campana, S.; Stella, L.; Parmar, A. N. +8 more
We report on two new XMM-Newton observations of the anomalous X-ray pulsar (AXP) 4U0142+614 performed in 2004 March and July, collecting the most accurate spectrum for this source. Furthermore, we analyse two short archival observations performed in 2002 February and 2003 January in order to study the long-term behaviour of this AXP. 4U0142+614 ap…
Hard X-ray emission of the Earth's atmosphere: Monte Carlo simulations
Sunyaev, R.; Revnivtsev, M.; Sazonov, S. +1 more
We perform Monte Carlo simulations of cosmic ray-induced hard X-ray radiation from the Earth's atmosphere. We find that the shape of the spectrum emergent from the atmosphere in the energy range 25-300 keV is mainly determined by Compton scatterings and photoabsorption, and is almost insensitive to the incident cosmic ray spectrum. We provide a fi…
Now you see it, now you don't - the circumstellar disc in the GRO J1008-57 system
Hill, A. B.; Coe, M. J.; Bird, A. J. +7 more
Multiwavelength observations are reported here of the Be/X-ray binary pulsar system GRO J1008-57. Over ten years worth of data are gathered together to show that the periodic X-ray outbursts are dependant on both the binary motion and the size of the circumstellar disc. In the first instance an accurate orbital solution is determined from pulse pe…
HESS J1616-508: likely to be powered by PSR J1617-5055
de Rosa, A.; Bird, A. J.; Ubertini, P. +3 more
HESS J1616-508 is one of the brightest emitters in the TeV sky. Recent observations with the IBIS/ISGRI telescope onboard the INTEGRAL spacecraft have revealed that a young, nearby and energetic pulsar, PSR J1617-5055, is a powerful emitter of soft γ-rays in the 20-100 keV domain. In this paper, we present an analysis of all available data from th…
Extragalactic MeV γ-ray emission from cocoons of young radio galaxies
Kawakatu, N.; Kino, M.; Ito, H.
Strong γ-ray emission from cocoons of young radio galaxies is predicted for the first time. Considering the process of adiabatic injection of the shock dissipation energy and mass of the relativistic jet in active nuclei into the cocoon, while assuming thermalizing electron plasma interactions, we find that the thermal electron temperature of the …
Broad-band X-ray spectrum of the newly discovered broad-line radio galaxy IGR J21247+5058
de Rosa, A.; Giroletti, M.; Bird, A. J. +7 more
In this paper, we present radio and high-energy observations of the INTEGRAL source IGR J21247+5058, a broad line emitting galaxy obscured by the Galactic plane. Archival Very Large Array radio data indicate that IGR J21247+5058 can be classified as an Faranoff-Riley type II Broad-Line Radio Galaxy. The spectrum between 610 MHz and 15 GHz is typic…
INTEGRAL observations of the Small Magellanic Cloud
Udalski, A.; Hill, A. B.; Coe, M. J. +10 more
The first INTEGRAL observations of the Small Magellanic Cloud (SMC) (carried out in 2003) are reported in which two sources are clearly detected. The first source, SMC X-1, shows a hard X-ray eclipse and measurements of its pulse period indicate a continuation of the long-term spin-up now covering approximately 30 years. The second source is likel…
INTEGRAL high-energy monitoring of the X-ray burster KS 1741-293
Ubertini, P.; Bazzano, A.; De Cesare, G. +4 more
KS 1741-293, discovered in 1989 by the X-ray camera TTM on the Kvant module of the Mir space station and identified as an X-ray burster, had not been detected in the hard X-ray band until the advent of the INTEGRAL observatory. Moreover, this source has recently been the object of scientific discussion, being also associated with a nearby extended…
An unexpected outburst from A0535+262
Hill, A. B.; Bird, A. J.; Scaringi, S. +6 more
A0535+262 is a transient Be/X-ray binary system which was in a quiescent phase from 1994 to 2005. In this paper we report on the timing and spectral properties of the INTEGRAL detection of the source in 2003 October. The source is detected for ~6000 s in the 18-100 keV energy band at a luminosity of ~3.8 × 1035ergs-1 this is …