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Abstract: Superdense massive galaxies r e~1 kpc; M~10^{11} Msun were common in theearly universe z>1.5. Within some hierarchical merging scenarios, anon-negligible fraction 1-10% of these galaxies is expected to survive sincethat epoch retaining their compactness and presenting old stellar populationsin the present universe. Using the NYU Value-Added Galaxy Catalog from the SDSSData Release 6 we find only a tiny fraction of galaxies ~0.03% with r e<1.5kpc and M *>8x10^{10} Msun in the local Universe z<0.2. Surprinsingly, theyare relatively young ~2 Gyr and metal-rich Z-H~0.2. The consequences ofthese findings within the current two competing size evolution scenarios forthe most massive galaxies -dry- mergers vs -puffing up- due to quasaractivity are discussed.



Author: Ignacio Trujillo, A. Javier Cenarro, Adriana de Lorenzo-Caceres, Alexandre Vazdekis, Ignacio G. de la Rosa, Antonio Cava

Source: https://arxiv.org/







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