Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-10-27
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
accepted for publication in MNRAS
Scientific paper
Aim of this work is a broad-band study with INTEGRAL, Swift and XMM-Newton satellites of a sample of 9 blazars (7 FSRQ and 2 BL Lac) with redshift up to about 4. The spectral analysis has shown clear evidence of a flattening of the continuum towards the low energies ($E<3$ keV observer frame). This behaviour is well reproduced both with an absorbed power-law model ($N_H\sim10^{20}$-$10^{23}$ cm$^{-2}$ in the rest-frame of the sources) or a broken power-law continuum model (with an energy break below 3 keV in the observer-frame). No Compton reflection features, Fe $K\alpha$ line and hump at high energies, have been detected, with the exception of the source IGR J22517+2218 that shows the presence of a weak iron line. In this work we also investigate a possible correlation between the absorption column density $N_H$ and the red-shift. We confirm the existence of a $N_H$-z trend, with the higher absorption at z$>$2 for a larger sample compared to previous results. The distribution of the $N_H$ and the photon index $\Gamma$ is also presented. The hard X-ray data allow us to detect highly absorbed sources (with $N_H\ge10^{23}$cm$^{-2}$ in rest-frame of the source) characterized by photon index distribution peaked at harder values ($\Gamma\sim1.4$) with respect to that obtained with XMM data only ($\Gamma\sim2$).
Bassani Loredana
Bazzano Angela
Dean Anthony J.
Gianni' S.
Rosa Adriano de
No associations
LandOfFree
An X-ray view of the INTEGRAL/IBIS blazars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An X-ray view of the INTEGRAL/IBIS blazars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An X-ray view of the INTEGRAL/IBIS blazars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-485815