Search Publications
Spectral behaviour of an INTEGRAL sample of black hole candidates: Initial results
Capitanio, F.; Bazzano, A.; Cadolle Bel, M. +13 more
In this paper, we present the spectral characteristics of a sample of Black Hole Candidates observed with the IBIS, SPI and JEM-X instruments on board the INTEGRAL Gamma-ray Observatory. This work is part of the long term, systematic, spectral study programme of intermediate intensity BHC (<500 mCrab) within the INTEGRAL Core Programme observat…
X-ray emission from PTT stars
Mason, H. E.; Bromage, G. E.; Landini, M. +4 more
We present preliminary results on an XMM-Newton observation dedicated to Post-T-Tauri (PTT) stars. We observed the visual binary 2RE J0241-53 of the Horologium association of nearby PTT stars. The XMM observations have been complemented with ground-based optical spectroscopy and photometry. Several flares have been observed. The X-ray spectrum of …
A highly-ionized absorber as a new explanation for the spectral changes during dips from X-ray binaries
Kaastra, J. S.; Díaz Trigo, M.; Parmar, A. N. +2 more
We report the XMM-Newton detection of narrow Fe XXV and Fe XXVI X-ray absorption lines at 7 keV in the persistent emission of the dipping low-mass X-ray binary (LMXB) 4U 1323-62. Such features have now been reported in a growing number of LMXBs seen almost edge-on, indicating that the highly-ionized plasma probably originates in an accretion disk …
Effects of the photo-ionized absorber on the continuum spectra of EXO 0748 676
Asai, Kazumi; Dotani, Tadayasu
We report on the analysis of XMM-Newton archival data of EXO 0748-676. We studied changes of the continuum spectra due to the presence of photo-ionized plasma on the line of sight. We show that the ionization degree of the plasma could change largely during the X-ray bursts and the dips. These changes can significantly modify the soft-band spectru…
Discovery of ADC absorption in the LMXB XB 1323-619 with XMM-Newton
Church, M. J.; Reed, D.; Dotani, T. +2 more
In our observation of the LMXB XB 1323-619 made with XMM-Newton in January 2003, a number of absorption lines were discovered, notably at 6.70 and 6.98 keV which we identify with scattering by high ionization state ions Fe XXV and Fe XXVI. Curve of growth analysis provided a consistent solution for collisional ionization for a plasma temperature k…
Flare diagnostics from loop modeling of a stellar flare observed with XMM-Newton
Reale, Fabio
XMM-Newton data of an X-ray flare observed on Proxima Centauri provide detailed and challenging constraints for flare modeling. The comparison of the data with the results of time-dependent hydrodynamic loop modeling of this flare allows us to constrain not only the loop morphology, but also the details of the heating function. The results show th…
INTEGRAL observation of the Crab pulsar
Cusumano, G.; Foschini, L.; Di Cocco, G. +5 more
In this paper, we present the timing and spectral analysis of several observations of the Crab pulsar with INTEGRAL. All these observations, when summed together provide an high-statistics data set which can be used for accurate phase resolved spectroscopy of the pulsed emission over the energy range 3 350 keV. In particular, we present the light …
An atlas of solar events: 1996 2005
Auchère, F.; Artzner, G.; Delaboudinière, J. P. +1 more
Coronal mass ejections (CMEs) are observed in the plane of the sky in coronographic images. As the solar surface is masked by an occulting disk it is not clear whether halo CMEs are directed towards or away from the Earth. Observations of the solar corona on the solar disk by the extreme ultraviolet imaging telescope (EIT) on board the Solar Helio…
XMM-Newton observation of a dust echo and X-ray flash in GRB 031203
Vaughan, S.; Watson, D.; O'Brien, P. T. +4 more
We present XMM-Newton observations of the X-ray afterglow of GRB 031203, approximately 6 h after the initial burst detection by Integral. At z = 0.105, GRB 031203 is one of the least luminous γ-ray bursts, with an equivalent isotropic γ-ray energy of ∼3 × 10 49 ergs. The XMM-Newton images reveal an expanding X-ray halo around GRB 031203…