The Era of the Photometric Redshift for Galaxies

Dear Colleagues,

The photometric redshift of a galaxy can be deduced from its colors when a spectrum is not available for direct redshift determination. In practice, the galaxy’s magnitude in several broad-band filters is compared to that expected from theoretical spectra of different types of galaxy at a range of redshifts. In the last years the number of catalogs characterized by the photometric redshift as indicator of the distance has progressively grown. As an example, the SWIRE catalog, see Rowan-Robinson 2013, has one million of galaxies and the GLADE catalog, see Dalia et al. (2016), one million and half galaxies. This high number of galaxies allows to pose the following questions.

1. What are the differences between photometric and spectroscopic Redshift (see Beck et al. (2017))?
2. Can we model the number of galaxies as function of the photometric redshift (see as an example Figure 15 in Bilicki et al. (2016))?
3. Can we detect, adopting the photometric redshifts, the voids visible in the slices of spatial distribution for galaxies?

References:

1. Dalya, G.; Frei, Z.; Galgoczi, G.; Raffai, P.; de Souza, R.S. VizieR Online Data Catalog: GLADE catalog (Dalya+, 2016). VizieR Online Data Catalog. Available Online: http://adsabs.harvard.edu/abs/2016yCat.7275....0D (accessed on 8 October 2017)
2. Rowan-Robinson, M.; Gonzalez-Solares, E.; Vaccari, M.; Marchetti, L. Revised SWIRE photometric redshifts. ‎ Mon. Not. Roy. Astron. Soc. 2013, 428, 1958–1967.
3. Bilicki, M.; Peacock, J.A.; Jarrett, T.H.; Cluver, M.E.; Maddox, N.; Brown, M.J.; Taylor, E.N.; Hambly, N.C.; Solarz, A.; Holwerda, B.W.; Baldry, I. WISE× SuperCOSMOS photometric redshift catalog: 20 million galaxies over 3π steradians. Astrophys. J. Suppl. 2016, 225, 5.
4. Beck, R; Lin, C.-A.; Ishida, E.E.O.; Gieseke, F.; de Souza, R.S.; Costa-Duarte, M.V.; Hattab, M.W.; Krone-Martins, A.; COIN Collaboration. On the realistic validation of photometric redshifts. Mon. Not. Roy. Astron. Soc. 2017, 468, 4323–4339.

Dr. Lorenzo Zaninetti
Guest Editor

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• spatial distribution of galaxies
• photometric redshift