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| Paper: |
RCSEDv2: analytic approximations of k-corrections for galaxies out to redshift z = 1 |
| Volume: |
535, Astronomical Data Analysis Software and Systems XXXI |
| Page: |
375 |
| Authors: |
Kasparova, A.; Chilingarian, I.; Borisov, S.; Goradzhanov, V.; Grishin, K.; Katkov, I.; Klochkov, V.; Rubtsov, E.; Toptun, V. |
| Abstract: |
To compare photometric properties of galaxies at different redshifts, we need to correct fluxes for the change of effective rest-frame wavelengths of filter band passes, 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, excluding cross-band correction, is implemented as standard functions in 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. |
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