A Balmer-line Broad Absorption Line Quasar

  title={A Balmer-line Broad Absorption Line Quasar},
  author={P. Hall},
I report the discovery of blueshifted broad absorption line (BAL) troughs in at least six transitions of the Balmer series of hydrogen (Hβ to H9) and in Ca II, Mg II and excited Fe II in the quasar SDSS J125942.80+121312.6. This is only the fourth active galactic nucleus known to exhibit Balmer absorption, all four in conjunction with low-ionization BAL systems containing excited Fe II. The substantial population in the n = 2 shell of H I in this quasar’s absorber likely arises from Ly… Expand
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