Chandra LETGS spectroscopy of the Quasar MR 2251 − 178 and its warm absorber

  • Stefanie Komossa
We present an analysis of our Chandra Low Energy Transmission Grating Spectrometer (LETGS) observation of the quasar MR 2251−178. The warm absorber of MR 2251−178 is well described by a hydrogen column density, N H ≈ 2 × 10 21 cm −2 , and an ionization parameter log(ξ) ≈ 0.6. We find in the spectrum weak evidence for narrow absorption lines from Carbon and… CONTINUE READING