Evolution of infrared luminosity functions of galaxies in the AKARI NEP-deep field

Goto, Tomotsugu; Takagi, Toshinobu; Matsuhara, Hideo; Takeuchi, Tsutomu T.; Pearson, Chris; Wada, Takehiko; Nakagawa, Takao; Ilbert, O.; Floc’h, E. Le; Oyabu, Shinki; Ohyama, Youichi; Malkan, M. A.; Lee, H. M.; Lee, M. G.; Inami, Hanae; Hwang, Narae; Hanami, H.; Im, Myungshin; Imai, Koji; Ishigaki, T.; Serjeant, S.; Shim, Hyunjin

doi:10.1051/0004-6361/200913182

Cited by 97 publications

(106 citation statements)

References 65 publications

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“…Here, we present the recent determination of mid-IR (8 µm and 12 µm) luminosity functions for local http://pkas.kas.org (z < 0.3) galaxies based on the multi-band data from the NEP-Wide point source catalogue covering from optical u * band to AKARI 24 µm band together with spectroscopic redshift data for selected sample. This work complements the results from the NEP-Deep Survey (Goto et al, 2010), which derived LFs for more distant universe (z > 0.3).…”

Section: The Nep-wide Datasupporting

confidence: 78%

Mir Luminosity Function of Galaxies in the Nep-Wide Field

2017

Publications of The Korean Astronomical Society

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We present the mid-infrared (MIR) luminosity function (LF) of local (z < 0.3) star-forming (SF) galaxies in the North Ecliptic Pole (NEP) field. This work is based on the NEP-Wide point source catalogue and the spectroscopic redshift (z) data for ∼ 1700 galaxies obtained by the optical follow-up survey with MMT/Hectospec and WIYN/Hydra. The AKARI's continuous 2 -24 µm coverage and the spectroscopic redshifts enable us to determine the spectral energy distribution (SED) in the mid-infrared and derive the luminosity functions of galaxies. Our 8 µm LF finds good agreements with the results from SWIRE field over the wide luminosity range, while showing significant difference from the NOAO deep data in the faint end. The comparison with higher-z sample shows significant luminosity evolution from z > 0.3 to local universe. 12 µm LF also shows a clear indication of luminosity evolution.

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Section: The Nep-wide Datasupporting

confidence: 78%

Mir Luminosity Function of Galaxies in the Nep-Wide Field

2017

Publications of The Korean Astronomical Society

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“…In their work, ∼20 000 objects were detected in the near-infrared (NIR) bands, while 7300 objects were detected in the MIR bands. Using these catalogues, Takagi et al (2010) 1 found LIRGs with unusually bright emission from PAH, and Goto et al (2010) evaluated the luminosity function without associated uncertainties from the K-correction. However, the original catalogue leaves room for improvement, especially in the image analysis stage, because most of the images are contaminated by scattered light from inside the detector, stray light from the Earth limb, artificial sources due to bright objects, and patterns from the optical system.…”

Section: Introductionmentioning

confidence: 99%

AKARI North Ecliptic Pole Deep Survey

Murata

Matsuhara

Wada

et al. 2013

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Context. We present the revised near-to mid-infrared catalogue of the AKARI North Ecliptic Pole deep survey. The survey has the unique advantage of continuous filter coverage from 2 to 24 μm over nine photometric bands, but the initial version of the survey catalogue leaves room for improvement in the image analysis stage; the original images are strongly contaminated by the behaviour of the detector and the optical system. Aims. The purpose of this study is to devise new image analysis methods and to improve the detection limit and reliability of the source extraction. Methods. We removed the scattered light and stray light from the Earth limb, and corrected for artificial patterns in the images by creating appropriate templates. We also removed any artificial sources due to bright sources by using their properties or masked them out visually. In addition, for the mid-infrared source extraction, we created detection images by stacking all six bands. This reduced the sky noise and enabled us to detect fainter sources more reliably. For the near-infrared source catalogue, we considered only objects with counterparts from ground-based catalogues to avoid fake sources. For our ground-based catalogues, we used catalogues based on the CFHT/MegaCam z band, CFHT/WIRCam Ks band and Subaru/Scam z band. Objects with multiple counterparts were all listed in the catalogue with a merged flag for the AKARI flux. Results. The detection limits of all mid-infrared bands were improved by ∼20%, and the total number of detected objects was increased by ∼2000 compared with the previous version of the catalogue; it now has 9560 objects. The 5σ detection limits in our catalogue are 11, 9, 10, 30, 34, 57, 87, 93, and 256 μJy in the N2, N3, N4, S7, S9W, S11, L15, L18W, and L24 bands, respectively. The astrometric accuracies of these band detections are 0.48, 0.52, 0.55, 0.99, 0.95, 1.1, 1.2, 1.3, and 1.6 arcsec, respectively. The false-detection rate of all nine bands was decreased to less than 0.3%. In total, 27 770 objects are listed in the catalogue, 11 349 of which have mid-infrared fluxes.

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“…Pérez-González et al 2005;Le Floc'h et al 2005;Babbedge et al 2006;Caputi et al 2007;Goto et al 2010). However, this work can suffer uncertainty from the k-correction, which requires knowing the appropriate mid-IR spectral energy distribution (SED).…”

Section: Introductionmentioning

confidence: 99%

Polycyclic aromatic hydrocarbon (PAH) luminous galaxies atz ~ 1

Takagi¹,

Ohyama

Goto

et al. 2010

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Aims. The NEP-deep survey, an extragalactic AKARI survey towards the north ecliptic pole (NEP), provides a comprehensive wavelength coverage from 2 to 24 μm using all 9 photometric bands of the infrared camera (IRC). It allows us to photometrically identify galaxies whose mid-IR emission is clearly dominated by PAHs. Methods. We propose a single-colour selection method to identify such galaxies, using two mid-IR flux ratios at 11-to-7 μm and 15-to-9 μm (PAH-to-continuum flux ratio in the rest frame), which are useful for identifying starburst galaxies at z ∼ 0.5 and 1, respectively. We perform a fitting of the spectral energy distributions (SEDs) from optical to mid-IR wavelengths, using an evolutionary starburst model with a proper treatment of radiative transfer (SBURT), in order to investigate their nature.Results. The SBURT model reproduces observed optical-to-mid-IR SEDs of more than a half of the PAH-selected galaxies. Based on the 8 μm luminosity, we find ultra luminous infrared galaxies (ULIRGs) among PAH-selected galaxies. Their PAH luminosity is higher than local ULIRGs with a similar luminosity, and the PAH-to-total IR luminosity ratio is consistent with that of less luminous starburst galaxies. They are a unique galaxy population at high redshifts, and we call these PAH-selected ULIRGs "PAH-luminous" galaxies. Although they are not as massive as submillimetre galaxies at z ∼ 2, they have the stellar mass of >3 × 10 10 M and therefore are moderately massive.

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Evolution of infrared luminosity functions of galaxies in the AKARI NEP-deep field

Cited by 97 publications

References 65 publications

Mir Luminosity Function of Galaxies in the Nep-Wide Field

Mir Luminosity Function of Galaxies in the Nep-Wide Field

AKARI North Ecliptic Pole Deep Survey

Polycyclic aromatic hydrocarbon (PAH) luminous galaxies atz ~ 1

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