First detection of WHIM filaments at cosmological distances
- 1 March 2004
- journal article
- research article
- Published by Cambridge University Press (CUP) in Proceedings of the International Astronomical Union
- Vol. 2004 (IAUC195) , 111-115
- https://doi.org/10.1017/s1743921304000249
Abstract
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 .To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.htmlKeywords
This publication has 0 references indexed in Scilit: