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Photometric redshift accuracy in AKARI deep surveys

Negrello, M.; Serjeant, S.; Pearson, C.; Takagi, T.; Efstathiou, A.; Goto, T.; Burgarella, D.; Jeong, W.-S.; Im, M.; Lee, H. M.; Matsuhara, H.; Oyabu, S.; Wada, T. and White, G. (2009). Photometric redshift accuracy in AKARI deep surveys. Monthly Notices of the Royal Astronomical Society, 394(1) pp. 375–397.

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We investigate the photometric redshift accuracy achievable with the AKARI infrared data in deep multiband surveys, such as in the North Ecliptic Pole field. We demonstrate that the passage of redshifted polycyclic aromatic hydrocarbons (PAH) and silicate features into the mid-infrared wavelength window covered by AKARI is a valuable means to recover the redshifts of starburst galaxies. To this end, we have collected a sample of ~60 galaxies drawn from the Great Observatories Origins Deep Survey-North Field with spectroscopic redshift 0.5 ≲zspec≲ 1.5 and photometry from 3.6 to 24 μm, provided by the Spitzer, Infrared Space Observatory and AKARI satellites. The infrared spectra are fitted using synthetic galaxy spectral energy distributions which account for starburst and active nuclei emission. For ~90 per cent of the sources in our sample, the redshift is recovered with an accuracy |zphot-zspec|/(1 +zspec) ~ 10 per cent. A similar analysis performed on a set of simulated spectra shows that the AKARI infrared data alone can provide photometric redshifts accurate to |zphot-zspec|/(1 +zspec) ~ 10 per cent (1σ) at z≲ 2 . At higher redshifts, the PAH features are shifted outside the wavelength range covered by AKARI and the photo-z estimates rely on the less prominent 1.6 μm stellar bump; the accuracy achievable in this case on (1 +z) is ~10–15 per cent, provided that the active galactic nuclei contribution to the infrared emission is subdominant. Our technique is no more prone to redshift aliasing than optical-ultraviolet photo-z, and it may be possible to reduce this aliasing further with the addition of submillimetre and/or radio data.

Item Type: Journal Item
Copyright Holders: 2009 The Authors, 2009 RAS (journal compilation)
ISSN: 1365-2966
Project Funding Details:
Funded Project NameProject IDFunding Body
From the Local Universe to the First Massive Galaxies:  the New IRAS Surveys for the 21st CenturyPP/D002400/1STFC (Science & Technology Facilities Council)
Keywords: galaxies: active; galaxies: starburst; infrared: galaxies
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 15419
Depositing User: Stephen Serjeant
Date Deposited: 26 Mar 2009 10:18
Last Modified: 18 May 2019 23:01
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