NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-19 T07:59:35 PDT
Help | Comment | NED Home

For refcode 2006A&A...460...45G:
Retrieve 51 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2006A&A...460...45G X-ray nature of the LINER nuclear sources Gonzalez-Martin, O.; Masegosa, J.; Marquez, I.; Guerrero, M. A.; Dultzin-Hacyan, D. Abstract. We report the results from a homogeneous analysis of the X-ray (Chandra ACIS) data available for a sample of 51 LINER galaxies selected from the catalogue by Carrillo et al. (1999, Rev. Mex. Astron. Astrofis., 35, 187) and representative of the population of bright LINER sources. The nuclear X-ray morphology has been classified by their nuclear compactness in the hard band (4.5-8.0 keV) into 2 categories: active galactic nuclei (AGN) candidates (with a clearly identified unresolved nuclear source) and starburst (SB) candidates (without a clear nuclear source). Sixty percent of the total sample are classified as AGNs, with a median luminosity of {L_X(2{-}10 keV)=2.5x10^40^ ergs^-1^}, which is an order of magnitude higher than for SB-like nuclei. The spectral fitting allows us to conclude that most of the objects need a non-negligible power-law contribution. When no spectral fitting can be performed (data with a low signal-to-noise ratio), the color-color diagrams allow us to roughly estimate physical parameters, such as column density, temperature of the thermal model, or spectral index for a power-law, and therefore to better constrain the origin of the X-ray emission. The X-ray morphology, the spectra, and the color-color diagrams together allow us to conclude that a high percentage of LINER galaxies, at least ~60%, could host AGN nuclei, although contributions from high-mass X-ray binaries or ultra-luminous X-ray sources cannot be ruled out for some galaxies. Key words: galaxies: nuclei, X-rays: galaxies, galaxies: active
Retrieve 51 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home