Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-25
Mon.Not.Roy.Astron.Soc.350:L67-L71,2004
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures, MNRAS accepted. Minor changes to sections 3.1 and 5
Scientific paper
10.1111/j.1365-2966.2004.07887.x
We report the results of XMM-Newton observations of the X-ray bright, radio-loud blazar GB B1428+4217 at a redshift of z=4.72. We confirm the presence of soft X-ray spectral flattening at energies <0.7 keV as reported in previous ROSAT and BeppoSAX observations. At hard X-ray energies the spectrum is consistent with a power-law although we find the spectral slope varied between both XMM-Newton observations and is also significantly different from that reported previously. Whilst we cannot rule-out intrinsic cold absorption to explain the spectral depression, we favour a dust-free warm absorber. Cold absorption requires a column density ~1.4-1.6 x 10^22 cm^-2 whilst a warm absorber could have up to ~10^23 cm^-2 and an ionization parameter ~10^2. The spectrum of GB B1428+4217 shows remarkable parallels with that of the z=4.4 blazar PMN J0525-3343, in which the available evidence is also most consistent with a warm absorber model.
Celotti Annalisa
Fabian Andrea C.
Iwasawa Kashuzi
Worsley M. A.
No associations
LandOfFree
XMM-Newton observations of GB B1428+4217: confirmation of intrinsic soft X-ray absorption 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 XMM-Newton observations of GB B1428+4217: confirmation of intrinsic soft X-ray absorption, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and XMM-Newton observations of GB B1428+4217: confirmation of intrinsic soft X-ray absorption will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-539375