In:
Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 59, No. sp2 ( 2007-10-10), p. S529-S542
Abstract:
We present the properties of 11 $\mu $m selected sources detected in the early data of the North Ecliptic Pole Deep (NEP-Deep) Survey of AKARI. The data set covers 6 wavelength bands from 2.5 to 11 $\mu $m, with exposure times of 10–20 minutes. This field lies within the CFHT survey with four filter bands ($g^\prime, r^\prime, i^\prime, z^\prime$), enabling us to establish nearly continuous spectral energy distributions (SEDs) for wavelengths ranging from 0.4 to 11 $\mu $m. The main sample studied here consists of 72 sources whose 11 $\mu $m AB magnitudes are equal to or brighter than 18.5 (144 $\mu $Jy), which is complete to more than 90%. The 11 $\mu $m band has an advantage of sampling star-forming galaxies with low-to-medium redshifts, since the prominent PAH feature shifts into this band. As expected, we find that the majority (71%) of 11 $\mu $m bright sources are star-forming galaxies at $0.2 \lesssim z \lesssim 0.7$ with $L_{\rm IR} \sim 10^{10}-10^{12}~L_{\odot}$ based on detailed modelling of the SEDs. We also find four AGNs lying at various redshifts in the main sample. In addition, we discuss a few sources that have non-typical SEDs of the main sample, including a brown-dwarf candidate, a steep power-law source, a flat-spectrum object, and an early-type galaxy at moderate redshift.
Type of Medium:
Online Resource
ISSN:
2053-051X
,
0004-6264
DOI:
10.1093/pasj/59.sp2.S529
Language:
English
Publisher:
Oxford University Press (OUP)
Publication Date:
2007
detail.hit.zdb_id:
2206640-8
detail.hit.zdb_id:
2083084-1
SSG:
16,12
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