Chandra Discovery of a Tree in the X-Ray Forest toward PKS 2155–304: The Local Filament?

@article{Nicastro2002ChandraDO,
  title={Chandra Discovery of a Tree in the X-Ray Forest toward PKS 2155–304: The Local Filament?},
  author={Fabrizio Nicastro and Andreas Zezas and Jeremy J. Drake and Martin Elvis and Fabrizio Fiore and Antonella Fruscione and Massimo Marengo and Smita Mathur and S. Bianchi Harvard-Smithsonian Center for Astrophysics and Cambridge and Usa and Osservatorio Astronomico di Roma and Monteporzio and Italy. and The Ohio State University and Columbus and Universita' di RomaTre and Roma},
  journal={The Astrophysical Journal},
  year={2002},
  volume={573},
  pages={157-167}
}
We present the first X-ray detection of resonant absorption from warm/hot local gas either in our Galaxy, or in the intergalactic space surrounding our Galaxy, along the line of sight toward the blazar PKS 2155-304. The Chandra HRCS/LETG spectrum of this z = 0.116 source clearly shows, at ≥5 σ level, unresolved (FWHM ≤ 800 km s-1 at a 2 σ confidence level) O VII Kα and Ne IX Kα resonant absorption lines at 21.603 and 13.448 A (i.e., cz = 14 km s-1 in the rest frame, from the O VII Kα line). O… 

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