AKARI Lightens the 15 μm Universe at 1<z<1.5: 15 μm Observation of the Extended Groth Strip

Details AKARI Lightens the 15 μm Universe at 1<z<1.5: 15 μm Observation of the Extended Groth Strip AKARI Lightens the 15 μm Universe at 1<z<1.5: 15 μm Observation of the Extended Groth Strip

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..418..527s&link_type=abstract

AKARI, a Light to Illuminate the Misty Universe ASP Conference Series, Vol. 418, proceedings of a conference held 16-19 February

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present AKARI 15 μm imaging observation of the Extended Groth Strip (EGS). The EGS is one of the most well-studied extragalactic survey fields with the wealth of deep multi-wavelength datasets as well as spectroscopic redshifts. However, EGS has lacked a crucial coverage in the wavelength between the Spitzer 8 μm and 24 μm. This could be troublesome in the study of cosmic star formation history at 1 < z < 1.5, since SEDs of IR luminous galaxies have a great complexity at the rest-frame ˜10 μm most likely due to varying amount of silicate absorption, and at the above redshift range, the feature falls into 24 μm. In order to better understand star formation activities at this very important epoch where IR star formation is near its peak, we carried out the AKARI 15 μm observation in the EGS with the Infrared Camera onboard AKARI over a total of area of 711 arcmin2 with the 50% completeness limit of 19.2 AB mag. We constructed a 15 μm selected sample of galaxies at 1 < z < 1.5 using optical-NIR-MIR imaging and spectroscopic redshift data, and through SED fitting for these 56 galaxies, we find the IR luminosity can be underestimated in the absence of 15 μm data. We also check the evolution of MIR SEDs of IR luminous galaxies with redshift, and confirm that it starts at z ≤ 1.

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