The X-ray emission of local luminous infrared galaxies

M. Pereira-Santaella, A. Alonso-Herrero, M. Santos-Lleo, L. Colina, E. Jiménez-Bailón, A. L. Longinotti, George H. Rieke, M. Ward, P. Esquej

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

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 = 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 ∼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? Kα emission line in the non-Seyfert LIRGs allows us to put an upper limit on the bolometric luminosity of an obscured AGN, Lbol <1043? 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%.

Original languageEnglish (US)
Article numberA93
JournalAstronomy and Astrophysics
Volume535
DOIs
StatePublished - 2011

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galaxies
luminosity
x rays
XMM-Newton telescope
star formation rate
newton
star formation
erg
nuclei
estimates
rate

Keywords

  • galaxies: active
  • galaxies: starburst
  • X-ray: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Pereira-Santaella, M., Alonso-Herrero, A., Santos-Lleo, M., Colina, L., Jiménez-Bailón, E., Longinotti, A. L., ... Esquej, P. (2011). The X-ray emission of local luminous infrared galaxies. Astronomy and Astrophysics, 535, [A93]. https://doi.org/10.1051/0004-6361/201117420

The X-ray emission of local luminous infrared galaxies. / Pereira-Santaella, M.; Alonso-Herrero, A.; Santos-Lleo, M.; Colina, L.; Jiménez-Bailón, E.; Longinotti, A. L.; Rieke, George H.; Ward, M.; Esquej, P.

In: Astronomy and Astrophysics, Vol. 535, A93, 2011.

Research output: Contribution to journalArticle

Pereira-Santaella, M, Alonso-Herrero, A, Santos-Lleo, M, Colina, L, Jiménez-Bailón, E, Longinotti, AL, Rieke, GH, Ward, M & Esquej, P 2011, 'The X-ray emission of local luminous infrared galaxies', Astronomy and Astrophysics, vol. 535, A93. https://doi.org/10.1051/0004-6361/201117420
Pereira-Santaella M, Alonso-Herrero A, Santos-Lleo M, Colina L, Jiménez-Bailón E, Longinotti AL et al. The X-ray emission of local luminous infrared galaxies. Astronomy and Astrophysics. 2011;535. A93. https://doi.org/10.1051/0004-6361/201117420
Pereira-Santaella, M. ; Alonso-Herrero, A. ; Santos-Lleo, M. ; Colina, L. ; Jiménez-Bailón, E. ; Longinotti, A. L. ; Rieke, George H. ; Ward, M. ; Esquej, P. / The X-ray emission of local luminous infrared galaxies. In: Astronomy and Astrophysics. 2011 ; Vol. 535.
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abstract = "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⊙ = 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 ∼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? Kα emission line in the non-Seyfert LIRGs allows us to put an upper limit on the bolometric luminosity of an obscured AGN, Lbol <1043? 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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AU - Santos-Lleo, M.

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AU - Jiménez-Bailón, E.

AU - Longinotti, A. L.

AU - Rieke, George H.

AU - Ward, M.

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N2 - 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⊙ = 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 ∼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? Kα emission line in the non-Seyfert LIRGs allows us to put an upper limit on the bolometric luminosity of an obscured AGN, Lbol <1043? 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%.

AB - 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⊙ = 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 ∼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? Kα emission line in the non-Seyfert LIRGs allows us to put an upper limit on the bolometric luminosity of an obscured AGN, Lbol <1043? 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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KW - galaxies: starburst

KW - X-ray: galaxies

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