Browsing by Subject "quasars: emission lines"

Now showing items 1-3 of 3

    • Detection of rest-frame optical lines from x-shooter spectroscopy of weak emission-line quasars 
      Plotkin, Richard; Shemmer, Ohad; Trakhtenbrot, Benny; Anderson, Scott; Brandt, W.; Fan, Xiaohui; Gallo, Elena; Lira Teillery, Paulina; Luo, Bin; Richards, Gordon; Schneider, Donald; Strauss, Michael; Wu, Jianfeng (The American Astronomical Society, 2015-06-01)
      Over the past 15 yr, examples of exotic radio-quiet quasars with intrinsically weak or absent broad emission line regions (BELRs) have emerged from large-scale spectroscopic sky surveys. Here, we present spectroscopy ...
    • Extended Lyα emission around quasars with eclipsing damped Lyα systems 
      Fathivavsari, H.; Petitjean, P.; Noterdaeme, P.; Paris, I.; Finley, H.; López, S.; Srianand, R. (2016)
      We present spectroscopic observations of six high redshift (z(em) > 2) quasars, which have been selected for their Lyman alpha (Ly alpha) emission region being only partially covered by a strong proximate (z(abs) similar ...
    • Ultraviolet Fe ii emission in fainter quasars: luminosity dependences, and the influence of environments 
      Clowes, Roger G.; Haberzettl, Lutz; Raghunathan, Srinivasan; Williger, Gerard M.; Mitchell, Sophia M.; Sochting, Ilona K.; Graham, Matthew J.; Campusano Brown, Luis (Oxford Univ. Press, 2016)
      We investigate the strength of ultraviolet Fe ii emission in fainter quasars compared with brighter quasars for 1.0 a parts per thousand currency sign z a parts per thousand currency sign 1.8, using the Sloan Digital Sky ...