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X-Ray Variability in LINERs

Published online by Cambridge University Press:  21 February 2013

L. Hernández-García ,
O. González-Martín ,
J. Masegosa  and
I Márquez
L. Hernández-García
Affiliation:
Instituto de Astrofísica de AndalucíaGlorieta de la Astronomía, s/n 18008, Granada, Spain
O. González-Martín
Affiliation:
Instituto de Astrofísica de Canarias, C/Vía Láctea s/n 38205 La Laguna, Tenerife, Spain email: lorena@iaa.es
J. Masegosa
Affiliation:
Instituto de Astrofísica de AndalucíaGlorieta de la Astronomía, s/n 18008, Granada, Spain
I Márquez
Affiliation:
Instituto de Astrofísica de AndalucíaGlorieta de la Astronomía, s/n 18008, Granada, Spain
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Abstract

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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⊙). 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.

Keywords

GalaxiesAGNLINERsvariabilityX-ray
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 41 - 44
Copyright
Copyright © International Astronomical Union 2013

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