The AKARI FU-HYU galaxy evolution program: first results from the GOODS-N field

• Published in: Astronomy and astrophysics (Berlin) 2010-05, Vol.514, p.A9
• Main Authors: Pearson, C. P., Serjeant, S., Negrello, M., Takagi, T., Jeong, W.-S., Matsuhara, H., Wada, T., Oyabu, S., Lee, H. M., Im, M. S.
• Format: Article
• Language: English
• Subjects: galaxies: evolution; infrared: galaxies; methods: observational; surveys
• ISSN: 0004-6361; 1432-0746
• DOI: 10.1051/0004-6361/200913383

The AKARI FU-HYU mission program carried out mid-infrared imaging of several well studied Spitzer fields preferentially selecting fields already rich in multi-wavelength data from radio to X-ray wavelengths filling in the wavelength desert between the Spitzer IRAC and MIPS bands. We present the initial results for the FU-HYU survey in the GOODS-N field. We utilize the supreme multiwavelength coverage in the GOODS-N field to produce a multiwavelength catalogue from infrared to ultraviolet wavelengths, containing more than 4393 sources, including photometric redshifts. Using the FU-HYU catalogue we present colour-colour diagrams that map the passage of PAH features through our observation bands. We find that the longer mid-infrared bands from AKARI (IRC-L18W 18 micron band) and Spitzer (MIPS24 24 micron band) provide an accurate measure of the total MIR emission of the sources and therefore their probable total mid-infrared luminosity. We also find that colours incorporating the AKARI IRC-S11 11 micron band produce a bimodal distribution where an excess at 11 microns preferentially selects moderate redshift star-forming galaxies. These powerful colour-colour diagnostics are further used as tools to extract anomalous colour populations, in particular a population of Silicate Break galaxies from the GOODS-N field showing that dusty starbursts can be selected of specific redshift ranges (z = 1.2–1.6) by mid-infrared drop-out techniques. The FU-HYU catalogue will be made publically available to the astronomical community.