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X-ray nuclear emission of a sample of LINER Galaxies

Published online by Cambridge University Press:  12 May 2006

O. González-Martín
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC), Apdo 3004, 10080 Granada, Spain
J. Masegosa
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC), Apdo 3004, 10080 Granada, Spain
I. Márquez
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC), Apdo 3004, 10080 Granada, Spain
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Abstract

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We report the results from an homogeneous analysis of the X-ray (ACIS-S/Chandra) data available for a sample of 52 LINER galaxies. The X-ray morphology has been classified attending to their nuclear compactness in the hard band (4.5–8.0 keV), into 2 categories: AGN-like nuclei (with a clearly identified unresolved nuclear source) and Starburst-like nuclei (without a clear nuclear source). 60% of the total sample are classified as AGNs, with a median luminosity of $\rm{L_{X}(2.0\hbox{-}10.0 keV)=2.5\times 10^{40} erg s^{-1}}$, which is an order of magnitude higher than that for SB-like nuclei. The spectral fitting allows to conclude that most of the objects need a non-negligible thermal contribution. When no spectral fitting can be performed (low signal-to-noise ratio), the Color-Color diagrams allow us to compute physical parameters such as density column, temperature of the thermal model or spectral index and therefore to analyze the origin of the X-ray emission. All X-ray morphology, spectral fitting and Color-Color diagrams allow conclude that a high percentage of LINER galaxies host AGN nuclei.

Type
Contributed Papers
Copyright
2006 International Astronomical Union