Browsing by Subject "accretion, accretion discs"

Now showing items 1-4 of 4

    • Active galactic nuclei at z ˜ 1.5 - I. Spectral energy distribution and accretion discs 
      Capellupo, D. M.; Netzer, H.; Lira Teillery, Paulina; Trakhtenbrot, B.; Mejía-Restrepo, Julian (Royal Astronomical Society, 2015)
      The physics of active super massive black holes (BHs) is governed by their mass (MBH), spin (a∗), and accretion rate (M˙ ). This work is the first in a series of papers with the aim of testing how these parameters determine ...
    • Correlated X-ray/ultraviolet/optical variability in the very low mass AGN NGC 4395 
      Cameron, D. T.; McHardy, I.; Dwelly, T.; Breedt, E.; Uttley, P.; Lira Teillery, Paulina; Arévalo, P. (WILEY-BLACKWELL, 2012-05)
      We report the results of a 1-yr Swift X-ray/ultraviolet (UV)/optical programme monitoring the dwarf Seyfert nucleus in NGC4395 in 2008–2009. The UV/optical flux from the nucleus was found to vary dramatically over the ...
    • The optical counterpart of the ultraluminous X-ray source NGC 5204 X-1 
      Goad, M. R.; Roberts, T. P.; Knigge, C.; Lira Teillery, Paulina (2002)
      We use archival HST/WFPC2 V- and I-band images to show that the optical counterpart to the ultraluminous X-ray source NGC 5204 X-1, reported by Roberts et al., is composed of two sources separated by 0.5 arcsec.We have ...
    • Swift monitoring of NGC 5548: X-ray reprocessing and short-term UV/optical variability 
      McHardy, I. M.; Cameron, D. T.; Dwelly, T.; Connolly, S.; Lira Teillery, Paulina; Emmanoulopoulos, D.; Gelbord, J.; Breedt, E.; Arevalo, P.; Uttley, P. (Royal Astronomical Society, 2014)
      Lags measured from correlated X-ray/UV/optical monitoring of AGN allow us to determine whether UV/optical variability is driven by reprocessing of X-rays or X-ray variability is driven by UV/optical seed photon variations. ...