Browsing by Subject "quasars"

Now showing items 1-4 of 4

    • BROAD ABSORPTION LINE VARIABILITY ON MULTI-YEAR TIMESCALES IN A LARGE QUASAR SAMPLE 
      Filiz, N.; Brandt, W. N.; Hall, P. B.; Schneider, D. P.; Anderson, S. F.; Hamann, F.; Lundgren, B. F.; Myers, Adam D.; Pâris, I.; Petitjean, P.; Ross, Nicholas P.; Shen, Yue; York, Don (The American Astronomical Society, 2013)
      We present a detailed investigation of the variability of 428 C iv and 235 Si iv broad absorption line (BAL) troughs identified in multi-epoch observations of 291 quasars by the Sloan Digital Sky Survey-I/II/III. These ...
    • Compatibility of the large quasar groups with the concordance cosmological model 
      Marinello, Gabriel E.; Clowes, Roger G.; Campusano Brown, Luis; Williger, Gerard M.; Sochting, Ilona K.; Graham, Matthew J. (2016)
      We study the compatibility of large quasar groups with the concordance cosmological model. Large quasar groups are very large spatial associations of quasars in the cosmic web, with sizes of 50-250 h(-1) Mpc. In particular, ...
    • Cosmological mass transport on galactic nuclei and the growth of high-z quasars 
      Prieto,; Escala, (Wiley-VCH Verlag, 2019)
      By using cosmological hydrodynamic simulations, we have studied how supernovae (SNe) and active galactic nuclei (AGN) feedback affect the mass transport (MT) process in high-redshift (z ∼ 6) galaxies and what the consequence ...
    • A glance at the host galaxy of high-redshift quasars using strong damped Lyman-α systems as coronagraphs 
      Finley, Hayley; Petitjean, Patrick; Pâris, Isabelle; Noterdaeme, Pasquier; Brinkmann, Jonathan; Myers, Adam D.; Ross, Nicholas P.; Schneider, Donald P.; Bizyaev, Dmitry; Brewington, Howard; Ebelke, Garrett; Malanushenko, Elena; Malanushenko, Viktor; Oravetz, Daniel; Pan, Kaike; Simmons, Audrey; Snedden, Stephanie (EDP Sciences, 2013)
      We searched quasar spectra from the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) for the rare occurrences where a strong damped Lyman-α absorber (DLA) blocks the Broad Line Region emission from the quasar and ...