Probing the Local Group Medium Toward Mkn 421 with Chandra and FUSE

Astronomy and Astrophysics – Astrophysics

Scientific paper

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31 pages including 8 figures, 1 table. Figures 6-8 corrected and pertinent discussions updated. Accepted to ApJ, 10 September

Scientific paper

10.1086/431343

We report the detection of highly-ionized gas at z~0 seen in resonant UV and X-ray absorption lines toward the z=0.03 blazar Mkn 421. A total of 13 X-ray and 3 UV lines were measured (or upper limits derived), including three lines in the OVII K-series and K\alpha transitions from neon, carbon, and nitrogen. From the three OVII lines we derive a 2\sigma Doppler parameter constraint of 24

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