An X-ray WHIM metal absorber from a Mpc-scale empty region of space

Details An X-ray WHIM metal absorber from a Mpc-scale empty region of space An X-ray WHIM metal absorber from a Mpc-scale empty region of space

2012-02-23

arxiv.org/abs/1202.5237v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

submitted to ApJ, 6 pages, 4 figures, comments are welcome

Scientific paper

We report a detection of an absorption line at ~44.8 {\AA} in a > 500 ks Chandra HRC-S/LETG X-ray grating spectrum of the blazar H 2356-309. This line can be identified as intervening CV-K{\alpha} absorption, at z\approx0.112, produced by a warm (logT = 5.1 K) intergalactic absorber. The feature is significant at a 4.2{\sigma} level, with a 0.2% chance detection probability. We estimate an equivalent hydrogen column density of log N_H=19.05 (Z/Zsun)^-1 cm^-2. Unlike other previously reported FUV/X-ray metal detections of warm-hot intergalactic medium (WHIM), this CV absorber lies in a region with locally low galaxy density, at ~2.2 Mpc from the closest galaxy at that redshift, and therefore is unlikely to be associated with an extended galactic halo. We instead tentatively identify this absorber with a genuine WHIM system permeating a large-scale, 30 Mpc extended, filament of galaxies crossing the sightline at z\approx0.112.

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