Formation and Evolution of Early-Type Galaxies: Spectro-Photometry from Cosmo-Chemo-Dynamical Simulations - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: One of the major challenges in modern astrophysics is to understand theorigin and the evolution of galaxies, the bright, massive early type galaxiesETGs in particular. Therefore, these galaxies are likely to be good probes ofgalaxy evolution, star formation and, metal enrichment in the early Universe.In this context it is very important to set up a diagnostic tool able tocombine results from chemo-dynamical N-Body-TSPH NB-TSPH simulations of ETGswith those of spectro-photometric population synthesis and evolution so thatall key properties of galaxies can be investigated. The main goal of this paperis to provide a preliminary validation of the software package before applyingit to the analysis of observational data. The galaxy models in use wherecalculated by the Padova group in two different cosmological scenarios: theSCDM, and the Lambda CDM. For these models, we recover theirspectro-photometric evolution through the entire history of the Universe. Wecomputed magnitudes and colors and their evolution with the redshift along withthe evolutionary and cosmological corrections for the model galaxies at ourdisposal, and compared them with data for ETGs taken from the COSMOS and theGOODS databases. Starting from the dynamical simulations and photometric modelsat our disposal, we created synthetic images from which we derived thestructural and morphological parameters. The theoretical results are comparedwith observational data of ETGs selected form the SDSS database. The simulatedcolors for the different cosmological scenarios follow the general trend shownby galaxies of the COSMOS and GOODS. Within the redshift range considered, allthe simulated colors reproduce the observational data quite well.



Author: Rosaria Tantalo, Simonetta Chinellato, Emiliano Merlin, Lorenzo Piovan, Cesare Chiosi

Source: https://arxiv.org/







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