Publication Date:
2020-10-20
Description:
We present a five broad-band (grizy) photometric catalog of Subaru/Hyper Suprime-Cam (HSC) optical imaging observations at around the North Ecliptic Pole (NEP) where the AKARI infrared (IR) satellite conducted a large survey (NEP-Wide survey). The observations cover almost all the NEP-Wide survey field down to the depth of 28.1, 26.8, 26.3, 25.5, and 25.0 mag (5σ) at grizy, respectively. The five-band HSC catalog contains about 2.6 million objects, and 70959 AKARI NEP-Wide counterpart sources are identified in the catalog. We added existing supplementary catalogs from the u-band to the far-IR band, and estimated photo-z for the AKARI-HSC sources. We achieved σΔz/(1 + zs) = 0.06 and an outlier rate of 13.4% at z = 0.2 − 1.5. Using the SED template fitting, we classified the AKARI-HSC galaxies into four categories, quiescent, star-forming, Type1-AGN, and Type2-AGN, in each redshift bin. At z 〉 1, the mean SED of star-forming galaxies in mid-IR (3 − 10μm) range is significantly different from that of spiral galaxies in the nearby Universe, indicating that many of star-forming galaxies at z 〉 1 contain a heat source capable of heating dust to temperatures that radiate thermal emission in the mid-IR range. Furthermore, we estimated the number fraction of AGNs (fAGN) in each bin of redshift and IR luminosity (LIR), and examined the dependence of redshift and LIR. In log(LIR/L⊙) = 11.0 − 14.0, the fAGN shows a significant increase with increasing redshift, regardless of the LIR bins. In contrast, the fAGN shows a slight increase against LIR at z 〈 1 and no increase with increasing LIR at z 〉 1.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
Permalink