First detection of WHIM filaments at cosmological distances

Details First detection of WHIM filaments at cosmological distances First detection of WHIM filaments at cosmological distances

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ogci.conf..111n&link_type=abstract

Outskirts of Galaxy Clusters: Intense Life in the Suburbs. Edited by Antonaldo Diaferio, IAU Colloquium #195, p.111-115

Physics

Scientific paper

In this contribution we present the detection of two WHIM filaments in the Chandra-LETG spectrum of Mkn 421. This spectrum has been obtained following 2 of our pre-approved Target of Opportunity requests to observe Blazars in outburst to efficiently "X-ray" the IGM at high spectral resolution. These observations caught the source at the unprecedented levels of 60 and 40 mCrab in the soft X-ray (0.5-2 keV) band. We detect, for the first time, two WHIM filaments at redshifts of z=0.011 and z=0.027, respectively. Based on these two detections and on the upper limits on associated HI and OVI absorption as inferred from the HST and FUSE spectra of Mkn 421, we estimate a number of WHIM filaments per unit redshift, with He-like ion columns NX ≳ 8 × 1014 cm-2 of dN/dz = 67+88-43, and a baryon mass density of Ωb = 0.021+0.028-0.014, virtually all of the "missing baryons" at z<1.

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