We discovered non-stellar Balmer absorption lines in two many-narrow-trough FeLoBALs (mntBALs) by the near-infrared spectroscopy with Subaru/CISCO. Presence of the non-stellar Balmer absorption lines is known to date only in the Seyfert galaxy NGC 4151, thus our discovery is the first cases for quasars. Since all known active galactic nuclei with Balmer absorption lines share characteristics, it is suggested that there is a population of BAL quasars which have unique structures at their nuclei or unique evolutionary phase.
@article{arxiv.astro-ph/0612366,
title = {Balmer Absorption Lines in FeLoBALs},
author = {K. Aoki and I. Iwata and K. Ohta and N. Tamura and M. Ando and M. Akiyama and G. Kiuchi and K. Nakanishi},
journal= {arXiv preprint arXiv:astro-ph/0612366},
year = {2007}
}
Comments
Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M. Wang (San Francisco: ASP)