Photometric redshifts in the North Ecliptic Pole Wide field based on a deep optical survey with Hyper Suprime-Cam
| Autor: | Daryl Joe D. Santos, Eunbin Kim, Ting Chi Huang, Hyunjin Shim, Matthew A. Malkan, Ho Seong Hwang, Ting Wen Wang, Tetsuya Hashimoto, Agnieszka Pollo, Seong Jin Kim, Simon C. C. Ho, Nagisa Oi, Yoshiki Toba, Tomotsugu Goto, Hideo Matsuhara, Helen K. Kim |
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| Rok vydání: | 2021 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
astro-ph.GA Infrared telescope FOS: Physical sciences Ecliptic pole Astrophysics Astronomy & Astrophysics 01 natural sciences galaxies [infrared] law.invention Photometry (optics) Telescope Observatory law 0103 physical sciences 010303 astronomy & astrophysics catalogues Photometric redshift Luminous infrared galaxy Physics 010308 nuclear & particles physics Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Redshift Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) astro-ph.CO distances and redshifts [galaxies] Astronomical and Space Sciences Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol 502, iss 1 Monthly Notices of the Royal Astronomical Society, vol 502, iss 1 |
| Popis: | The $AKARI$ space infrared telescope has performed near- to mid-infrared (MIR) observations on the North Ecliptic Pole Wide (NEPW) field (5.4 deg$^2$) for about one year. $AKARI$ took advantage of its continuous nine photometric bands, compared with NASA's $Spitzer$ and WISE space telescopes, which had only four filters with a wide gap in the MIR. The $AKARI$ NEPW field lacked deep and homogeneous optical data, limiting the use of nearly half of the IR sources for extra-galactic studies owing to the absence of photometric redshifts (photo-zs). To remedy this, we have recently obtained deep optical imaging over the NEPW field with 5 bands ($g$, $r$, $i$, $z$, and $Y$) of the Hyper Suprime-Camera (HSC) on the Subaru 8m telescope. We optically identify AKARI-IR sources along with supplementary $Spitzer$ and WISE data as well as pre-existing optical data. In this work, we derive new photo-zs using a $\chi^2$ template-fitting method code ($Le$ $Phare$) and reliable photometry from 26 selected filters including HSC, $AKARI$, CFHT, Maidanak, KPNO, $Spitzer$ and WISE data. We take 2026 spectroscopic redshifts (spec-z) from all available spectroscopic surveys over the NEPW to calibrate and assess the accuracy of the photo-zs. At z < 1.5, we achieve a weighted photo-z dispersion of $\sigma_{\Delta{z/(1+z)}}$ = 0.053 with $\eta$ = 11.3% catastrophic errors. Comment: 20 pages, 13 figures, accepted for publication in MNRAS. For summary video, please see http://youtu.be/hjNJRCoBIgg |
| Databáze: | OpenAIRE |
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