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X-ray variability in LINERs

Published online by Cambridge University Press:  25 July 2014

Josefa Masegosa ,
Lorena Hernández-García ,
Isabel Márquez  and
Omaira González-Martín
Josefa Masegosa
Affiliation:
Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain email: pepa@iaa.es
Lorena Hernández-García
Affiliation:
Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain email: pepa@iaa.es
Isabel Márquez
Affiliation:
Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain email: pepa@iaa.es
Omaira González-Martín
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain
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Abstract

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One of the most important features in active galactic nuclei (AGN) is the variability of their emission. Variability has been discovered at X-ray, UV, and radio frequencies on time scales from hours to years. Among the AGN family and according to theoretical studies, Low-Ionization Nuclear Emission Line Region (LINER) nuclei would be variable objects on long time scales. Our purpose is to investigate spectral X-ray variability in LINERs and to understand the nature of these kinds of objects, as well as their accretion mechanism. Chandra and XMM–Newton public archives were used to compile X-ray spectra of LINER nuclei at different epochs with time scales of years. To search for variability we fit all the spectra from the same object with a set of models, in order to identify the parameters responsible for the variability pattern. We found that long term spectral variability is very common, with variations mostly related to hard energies (2-10 keV). These variations are due to changes in the soft excess, and/or changes in the absorber, and/or intrinsic variations of the source.

Keywords

Galaxies: active – X-rays: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 399 - 402
Copyright
Copyright © International Astronomical Union 2014 

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