The central energy source of 70micron-selected galaxies: Starburst or AGN?

Details The central energy source of 70micron-selected galaxies: Starburst or AGN? The central energy source of 70micron-selected galaxies: Starburst or AGN?

2009-12-16

arxiv.org/abs/0912.3038v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

20 pages, 14 figures, accepted for publication in MNRAS

Scientific paper

We present the first AGN census in a sample of 61 galaxies selected at 70microns, a wavelength which should strongly favour the detection of star-forming systems. For the purpose of this study we take advantage of deep Chandra X-ray and Spitzer infrared (3.6-160micron) data, as well as optical spectroscopy and photometry from the Deep Extragalactic Evolutionary Probe 2 (DEEP2) survey for the Extended Groth Strip (EGS) field. We investigate spectral line diagnostics ([OIII]/Hbeta and [NeIII]/[OII] ratios, Hdelta Balmer absorption line equivalent widths and the strength of the 4000Ang break), X-ray luminosities and spectral energy distributions (SEDs). We find that the 70micron sources are undergoing starburst episodes and are therefore characterised by a predominance of young stars. In addition, 13 per cent of the sources show AGN signatures and hence potentially host an AGN. When the sample is split into starbursts (SBs, 10^10

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