AKARI Detections of Submm Galaxies, and Vice Versa

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present a comparison between the SCUBA Half Degree Extragalactic Survey (SHADES) at 450 μm, 850 μm and 1100 μm in the Lockman Hole East with deep AKARI and Spitzer surveys at 3.6-24 μm conducted in guaranteed time. We analysed the AKARI data using bespoke Interactive Data Language (IDL) routines modelled in part on the zerofootprint drizzling and noise-weighted matched filtering developed for SHADES. A provisional flux calibration was performed by cross-matching to the Infrared Space Observatory (ISO) data. The outstanding mid-infrared multi-wavelength coverage from AKARI and Spitzer is a superlative diagnostic of the bolometric contributions from active galactic nuclei (AGN), and we find that (53±12)% of submm galaxies well-fit by radiative transfer models have AGN bolometric fractions fAGN > 0.3. We confirm the correspondence between the contributions to the mid-infrared and submm backgrounds found in SHADES paper IX, and find that AKARI 15 μm galaxies with >200 μJy contribute ˜10% of the 450 μm and 850 μm background, but only ˜3% of the 1100 μm background, suggestive of different populations contributing at mm-wavelengths. The ultra-deep 450 μm SCUBA-2 Cosmology Survey will find sources well within the detectability of AKARI.

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