Mon. Not. R. Astron. Soc., 394, 375-397 (2009/March-3)
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.
Abstract (from CDS):
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 24µm, 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 1.6µm 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.
© 2009 The Authors. Journal compilation © 2009 RAS
galaxies: active - galaxies: starburst - infrared: galaxies
VizieR on-line data:
<Available at CDS (J/MNRAS/394/375): table2.dat table3.dat>
Tables 2-3: [NSP2009] IDNN (Nos 1-59).
Status at CDS
All or part of tables of objects could be ingested in SIMBAD with priority 2.
In ref. list Aussel + 1999 1999ApJ.342.313A is a misprint for 1999A&A.342.313A
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