Bibcode
Márquez, I.; Masegosa, J.; González-Martín, O.; Hernández-García, L.
Referencia bibliográfica
Feeding Compact Objects: Accretion on All Scales, Proceedings of the International Astronomical Union, IAU Symposium, Volume 290, pp. 41-44
Fecha de publicación:
2
2013
Número de citas
0
Número de citas referidas
0
Descripción
Active galactic nuclei (AGN) are powered by energetic phenomena which
cannot be attributed to stars. LINERs appears to be the low power end of
the AGN sequence with the lowest Eddington ratios but hosting the most
massive black holes (typically 109 M&sun;). Whereas
variability is common for high Eddington ratio emitting sources, in the
low Eddington regime data are not so clear. Recent investigations at UV
(Maoz et al. 2005) and X-ray frequencies (Younes et al. 2011,
González-Martín et al. 2011) point out to the long term
variable nature for some particular LINERs.
In this work we add more evidence about the X-ray variability in LINERs
and investigate its nature. The data set comprises X-ray archival
spectroscopy from observations taken from Chandra and XMM-Newton,
selecting LINERs with several observations at different epochs. Up to
now we analysed two LINER 1.9 objects, NGC 1052 and NGC 4278, and
checked that variability is due to different mechanisms based on the
results of spectral fittings.