4 research outputs found
X-ray - Infrared relation of AGNs and search for highly obscured accretion in the AKARI NEP Field
The infrared Astronomical Satellite AKARI conducted deep ( 0.4 deg)
and wide ( deg) surveys around the North Ecliptic Pole (NEP) with
its InfraRed Camera (IRC) with nine filters continuously covering the 2-25
m range. These photometric bands include three filters that fill the
`Spitzer gap' between the wavelength coverages of IRAC and MIPS. This unique
feature has enabled us to make sensitive mid-infrared detection of AGN
candidates at z 1-2, based on the Spectral Energy Distribution (SED)
fitting including hot dust emission in the AGN torus. This enables us to
compare X-rays and the AGN torus component of the infrared emission to help us
identify highly absorbed AGNs, including Compton-thick ones. We report our
results of the Chandra observation of the AKARI NEP Deep Field and discuss the
prospects for upcoming Spectrum-RG (eROSITA+ART-XC) on the AKARI Wide field.Comment: 4 pages, 2 figures. Submitted for publication in the proceedings of
the IAU Symp. 341 "PanModel2018 : Challenges in Panchromatic Galaxy Modelling
with Next Generation Facilities
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Hyper Suprime-Camera Survey of the Akari NEP Wide Field
The extragalactic background suggests half the energy generated by stars was reprocessed into the infrared (IR) by dust. At z ∼1.3, 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 deg2), using ∼10% of the entire pointed observations available throughout its lifetime. However, there remain 11,000 AKARI infrared sources undetected with the previous CFHT/Megacam imaging (r ∼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 1 z g, r, i, z, and y) using Hyper Suprime-Camera (HSC), which has 1.5 deg field of view in diameter on Subaru 8m telescope. This will provide photometric redshift information, and thereby IR luminosity for the previously-undetected 11,000 faint AKARI IR sources. Combined with AKARI's mid-IR AGN/SF diagnosis, and accurate mid-IR luminosity measurement, this will allow a complete census of cosmic star-formation/AGN accretion history obscured by dust