RCSEDv2: analytic approximations of k-corrections for galaxies out to redshift $z=1$ - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2024

RCSEDv2: analytic approximations of k-corrections for galaxies out to redshift $z=1$

Anastasia Kasparova
  • Fonction : Auteur
Igor Chilingarian
  • Fonction : Auteur
Sviatoslav Borisov
  • Fonction : Auteur
Vladimir Goradzhanov
  • Fonction : Auteur
Ivan Katkov
  • Fonction : Auteur
Vladislav Klochkov
  • Fonction : Auteur
Evgenii Rubtsov
  • Fonction : Auteur
Victoria Toptun
  • Fonction : Auteur

Résumé

To compare photometric properties of galaxies at different redshifts, we need to correct fluxes for the change of effective rest-frame wavelengths of filter bandpasses, called $k$-corrections. At redshifts $z>0.3$, the wavelength shift becomes so large that typical broadband photometric bands shift into the neighboring rest frame band. At $z=0.6-0.8$ the shift reaches two or even three bands. Therefore, we need perform $k$-corrections from one observed bandpass to another. Here we expand the methodology proposed by Chilingarian et al. (2010) and fit cross-band $k$-corrections by smooth low-order polynomial functions of one observed color and a redshift - this approach but without cross-band is implemented as standard functions in {\sc topcat}, which can be used for galaxies at $z<0.5$. We also computed analytic approximations for WISE bands, which were not available in the past. We now have a complete set of $k$-corrections coefficients, which allow us to process photometric measurements for galaxies out to redshift $z=1$. We calculated standard and cross-band $k$-corrections for about 4 million galaxies in second Reference Catalog of Spectral Energy Distributions (RCSEDv2) of galaxies and we showed that, in cases of widely used UV, optical and near-infrared filters, our analytic approximations work very well and can be used for extragalactic data from future wide-field surveys.

Dates et versions

hal-03514055 , version 1 (06-01-2022)

Identifiants

Citer

Anastasia Kasparova, Igor Chilingarian, Sviatoslav Borisov, Vladimir Goradzhanov, Kirill Grishin, et al.. RCSEDv2: analytic approximations of k-corrections for galaxies out to redshift $z=1$. 31st Astronomical Data Analysis Software and Systems, Oct 2021, Cape Town, South Africa. pp.377. ⟨hal-03514055⟩
14 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More