A view of PKS 2155-304 with XMM-Newton Reflection Grating Spectrometers
Astrophysics
2009-11-10 v1
Abstract
We present the high resolution X-ray spectrum of the BL Lac object PKS 2155-304 taken with the RGS units onboard XMM-Newton in November 2000. We detect a OVII Kalpha resonant absorption line from warm/hot local gas at 21.59A (~4.5 sigma detection). The line profile is possibly double peaked. We do not confirm the strong 20.02 A absorption line seen with Chandra and interpreted as z~0.05 OVIII Kalpha. A 3sigma upper limit of 14 mA on the equivalent width is set. We also detect the ~23.5 A interstellar OI 1s-->2p line and derive a factor <=1.5 subsolar O/H ratio in the ISM along PKS 2155-304 line of sight.
Cite
@article{arxiv.astro-ph/0311578,
title = {A view of PKS 2155-304 with XMM-Newton Reflection Grating Spectrometers},
author = {I. Cagnoni and F. Nicastro and L. Maraschi and A. Treves and F. Tavecchio},
journal= {arXiv preprint arXiv:astro-ph/0311578},
year = {2009}
}
Comments
13 pages, 5 figures, 3 tables, emulateapj style. Accepted by ApJ