期刊
ASTRONOMY & ASTROPHYSICS
卷 535, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201117420
关键词
galaxies: active; galaxies: starburst; X-ray: galaxies
资金
- CSIC [JAE-Predoc-2007]
- Spanish Plan Nacional del Espacio [ESP2007-65475-C02-01]
- Plan Nacional de Astronomia y Astrofisica [AYA2009-05705-E]
- Science and Technology Facilities Council [ST/I001573/1] Funding Source: researchfish
- STFC [ST/I001573/1] Funding Source: UKRI
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 log L-IR/L-circle dot = 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 (0.5-2 keV) 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 similar to 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 (2-10 keV) luminosity correlation of local starbursts. The non-detection of the 6.4 keV Fe K alpha emission line in the non-Seyfert LIRGs allows us to put an upper limit on the bolometric luminosity of an obscured AGN, L-bol < 10(43) erg s(-1). 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%.
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