Browsing by Subject "Acrecencia (Astrofísica)"

Now showing items 1-5 of 5

    • Active galactic nuclei at z similar to 1.5-I. Spectral energy distribution and accretion discs 
      Capellupo, D. M.; Netzer, H.; Lira Teillery, Paulina; Trakhtenbrot, B.; Mejía Restrepo, Julián (Oxford University Press, 2015)
      The physics of active super massive black holes (BHs) is governed by their mass (MBH), spin (a(*)) , and accretion rate ((M) over dot). This work is the first in a series of papers with the aim of testing how these parameters ...
    • Active galactic nuclei at z ∼ 1.5 – III. Accretion discs and black hole spin 
      Capellupo, Daniel; Netzer, Hagai; Lira Teillery, Paulina; Trakhtenbrot, Benny; Mejía Restrepo, Julián (Oxford University Press, 2016)
      This is the third paper in a series describing the spectroscopic properties of a sample of 39 AGN at z similar to 1.5, selected to cover a large range in black hole mass (M-BH) and Eddington ratio (L/L-Edd). In this paper, ...
    • Evidence for Periodicity in 43 Year-Long Monitoring of NGC 5548 
      Bon, Edi; Zucker, S.; Netzer, H.; Marziani, Paola; Bon, N.; Jovanovic, Predrag; Shapovalova, A. I.; Komossa, S.; Gaskell, C. M.; Popović, Ljiljana; Britzen, Stefan; Chavushyan, V. H.; Burenkov, A.; Sergeev, S. G.; La Mura, Giovanni; Valdés, J. R.; Stalevski, Marko (IOP, 2016)
      We present an analysis of 43 years (1972 to 2015) of spectroscopic observations of the Seyfert 1 galaxy NGC 5548. This includes 12 years of new unpublished observations (2003 to 2015). We compiled about 1600 H beta spectra ...
    • Precession and accretion in circumbinary discs: the case of HD 104237 
      Dunhill, A. C.; Cuadra, J.; Dougados, Catherine (Royal Astronomical Society, 2015)
      We present the results of smoothed particle hydrodynamics (SPH) simulations of the disc around the young, eccentric stellar binary HD 104237. We find that the binary clears out a large cavity in the disc, driving a ...
    • The origin of UV-optical variability in AGN and test of disc models: XMM-Newton and ground-based observations ... 
      McHardy, I. M.; Connolly, S. D.; Peterson, B. M.; Bieryla, A.; Chand, H.; Elvis, M. S.; Emmanoulopoulos, D.; Falco, E.; Kaspi, S.; Latham, D.; Lira Teillery, Paulina; McCully, C.; Netzer, H.; Uemura, M. (Wiley, 2016)
      The origin of short timescale (weeks/months) variability of AGN, whether due to intrinsic disc variations or reprocessing of X-ray emission by a surrounding accretion disc, has been a puzzle for many years. However recently ...