Astronomy and Astrophysics, volume 535A, 93-93 (2011/11-1)
The X-ray emission of local luminous infrared galaxies.
PEREIRA-SANTAELLA M., ALONSO-HERRERO A., SANTOS-LLEO M., COLINA L., JIMENEZ-BAILON E., LONGINOTTI A.L., RIEKE G.H., WARD M. and ESQUEJ P.
Abstract (from CDS):
We study the X-ray emission of a representative sample of 27 local luminous infrared galaxies (LIRGs). The median IR luminosity of our sample is logLIR/L☉=11.2, therefore the low-luminosity end of the LIRG class is well represented. We used new XMM-Newton data as well as Chandra and XMM-Newton archive data. The soft X-ray (0.5-2keV) emission of most of the galaxies (>80%), including LIRGs hosting a Seyfert 2 nucleus, is dominated by star-formation-related processes. These LIRGs follow the star-formation rate (SFR) versus soft X-ray luminosity correlation observed in local starbursts. We find that ∼15% of the non-Seyfert LIRGs (3 out of 20) have an excessively hard X-ray emission relative to that expected from star-formation, which might indicate the presence of an obscured AGN. The rest of the non-Seyfert LIRGs follow the SFR versus hard X-ray (2-10keV) luminosity correlation of local starbursts. The non-detection of the 6.4keV FeKα emission line in the non-Seyfert LIRGs allows us to put an upper limit on the bolometric luminosity of an obscured AGN, Lbol<1043erg/s. That is, if these galaxies were hosting a low-luminosity AGN, its contribution to the total luminosity would be less than 10%. Finally we estimate that the AGN contribution to the total luminosity for our sample of local LIRGs is between 7% and 10%.
galaxies: active - galaxies: starburst - X-ray: galaxies
Paragraph. 4.2 ULX candidate in NGC 2369 is 1RXS J071638.2-622024 in Simbad.
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