Nature of the soft X-ray emission in LINERs through RGS/XMM-Newton spectra

Details Nature of the soft X-ray emission in LINERs through RGS/XMM-Newton spectra Nature of the soft X-ray emission in LINERs through RGS/XMM-Newton spectra

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1248..343g&link_type=abstract

X-RAY ASTRONOMY 2009; PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES: Proceedings of the International Confer

Astronomy and Astrophysics

Astronomy

Galactic Nuclei, X-Ray Spectroscopy, Brightness, Seyfert Galaxies, Galactic Nuclei, Circumnuclear Matter, And Bulges, X-Ray, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Active And Peculiar Galaxies And Related Systems

Scientific paper

In this paper we present the differences and similarities found between Low Ionization Narrow Emission Regions (LINERs) and Seyfert 2s based on their X-ray and optical emission. We have performed a careful study of the X-ray nuclear properties of a sample of 82 of these LINERs [1, 2, 3]. Around 90% of our sample galaxies show evidences of hosting an AGN. However, the most important question remains still open: Why are they different to other AGN? One of the most important differences that we find is that a thermal component is needed in a high fraction of LINERs (90%). We also present here the preliminary results on a high-resolution soft X-ray (0.2-2 keV) spectroscopic study of a sample of 53 LINERs observed with the Reflection Grating Spectrometer (RGS) on board XMM-Newton. We have found that, in most cases, the soft spectra actually result from the blending of emission lines, similarly to what is found in Seyfert galaxies [4]. Emission lines between 5-30Ȧ have been systematically fitted to obtain their fluxes. We have found than for at least 30% of the sample the photoionization by the nuclear source is required to explain the spectral emission.

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