Hyper Suprime-Camera Survey of the AKARI NEP wide field
Tomotsugu Goto (NTHU), the AKARI NEP team

TL;DR
This study combines deep optical imaging from Hyper Suprime-Camera with AKARI's infrared data to identify and characterize previously undetected IR sources, aiming to better understand the obscured cosmic star formation history.
Contribution
It presents a novel multi-wavelength approach to determine redshifts and IR luminosities of faint IR sources, enhancing the census of dust-obscured star formation and AGN activity.
Findings
Identification of 11,000 previously undetected IR sources
Potential doubling of the cosmic star-formation rate density at z~1-2
Enhanced understanding of dust-obscured star formation and AGN activity
Abstract
The extragalactic background suggests half the energy generated by stars reprocessed into the infrared (IR) by dust. At z1.3, 90\% of star formation is obscured by dust. To fully understand the cosmic star formation history, it is critical to investigate infrared emission. AKARI has made deep mid-IR observation using its continuous 9-band filters in the NEP field (5.4 deg), using 10\% of the entire pointed observations available throughout its lifetime. However, there remain 11,000 AKARI's infrared sources undetected with the previous CFHT/Megacam imaging (25.9ABmag). Redshift and IR luminosity of these sources are unknown. These sources may contribute significantly to the cosmic star-formation rate density (CSFRD). For example, if they all lie at 12, the CSFRD will be twice as high at the epoch. We are carrying out deep imaging of the NEP field in 5 broad…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Adaptive optics and wavefront sensing · Particle Accelerators and Free-Electron Lasers
