SIMBAD references

2009MNRAS.399.1373N - Mon. Not. R. Astron. Soc., 399, 1373-1402 (2009/November-1)

Exploring the active galactic nucleus and starburst content of local ultraluminous infrared galaxies through 5-8 µm spectroscopy.

NARDINI E., RISALITI G., SALVATI M., SANI E., WATABE Y., MARCONI A. and MAIOLINO R.

Abstract (from CDS):

We present a 5-8 µm analysis of the Spitzer spectra of 71 ultraluminous infrared galaxies (ULIRGs) with redshift z < 0.15, devoted to the study of the role of active galactic nuclei (AGN) and starbursts (SBs) as the power source of the extreme infrared emission. Around ∼5 µm, an AGN is much brighter (by a factor of ~30) than an SB of equal bolometric luminosity. This allows us to detect the presence of even faint accretion-driven cores inside ULIRGs: signatures of AGN activity are found in ∼70 per cent of our sample (50/71 sources). Through a simple analytical model, we are also able to obtain a quantitative estimate of the AGN/SB contribution to the overall energy output of each source. Although the main fraction of ULIRG luminosity is confirmed to arise from star formation events, the AGN contribution is non-negligible (∼23 per cent) and is shown to increase with luminosity. The existence of a rather heterogeneous pattern in the composition and geometrical structure of the dust among ULIRGs is newly supported by the comparison between individual absorption features and continuum extinction.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): galaxies: active - galaxies: starburst - infrared: galaxies

CDS comments: In chap. 3 : IRAS 15462+0450 is a misprint for IRAS 15462-0450.

Simbad objects: 78

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