FERENGI: Redshifting galaxies from SDSS to GEMS, STAGES and COSMOS
Marco Barden, Knud Jahnke, Boris H\"au{\ss}ler

TL;DR
FERENGI is a method for creating realistic simulated images of galaxies at various redshifts from SDSS data, aiding galaxy evolution studies by accounting for observational effects.
Contribution
The paper introduces FERENGI, a novel tool that generates realistic high-redshift galaxy images from low-redshift SDSS data, incorporating effects like size, brightness, and spectral changes.
Findings
Generated datasets for 0.1<z<1.1 redshifts for GEMS and COSMOS.
Simulated images include effects of size, brightness, spectral shifts, and instrument PSF.
Code and datasets are publicly available for further research.
Abstract
We describe the creation of a set of artificially "redshifted" galaxies in the range 0.1<z<1.1 using a set of ~100 SDSS low redshift (v<7000 km/s) images as input. The intention is to generate a training set of realistic images of galaxies of diverse morphologies and a large range of redshifts for the GEMS and COSMOS galaxy evolution projects. This training set allows other studies to investigate and quantify the effects of cosmological redshift on the determination of galaxy morphologies, distortions and other galaxy properties that are potentially sensitive to resolution, surface brightness and bandpass issues. We use galaxy images from the SDSS in the u, g, r, i, z filter bands as input, and computed new galaxy images from these data, resembling the same galaxies as located at redshifts 0.1<z<1.1 and viewed with the Hubble Space Telescope Advanced Camera for Surveys (HST ACS). In…
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