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2004MNRAS.350.1005K - Mon. Not. R. Astron. Soc., 350, 1005-1014 (2004/May-3)
Down-sizing in galaxy formation at z ∼ 1 in the Subaru/XMM-Newton Deep Survey (SXDS).
KODAMA T., YAMADA T., AKIYAMA M., AOKI K., DOI M., FURUSAWA H., FUSE T., IMANISHI M., ISHIDA C., IYE M., KAJISAWA M., KAROJI H., KOBAYASHI N., KOMIYAMA Y., KOSUGI G., MAEDA Y., MIYAZAKI S., MIZUMOTO Y., MOROKUMA T., NAKATA F., NOUMARU J., OGASAWARA R., OUCHI M., SASAKI T., SEKIGUCHI K., SHIMASAKU K., SIMPSON C., TAKATA T., TANAKA I., UEDA Y., YASUDA N. and YOSHIDA M.
Abstract (from CDS):
This apparent age gradient, where massive galaxies are dominated by old stellar populations while less massive galaxies have more extended star formation histories, supports the `down-sizing' idea where the mass of galaxies hosting star formation decreases as the Universe ages. Combined with the lack of evolution in the shape of the stellar mass function for massive galaxies since at least z∼ 1, it appears that galaxy formation processes (both star formation and mass assembly) should have occurred in an accelerated way in massive systems in high-density regions, while these processes should have been slower in smaller systems. This result provides an interesting challenge for modern cold dark matter based galaxy formation theories which predict later formation epochs of massive systems, commonly referred to as `bottom-up'.
Abstract Copyright: 2004 RAS
Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: formation - galaxies: stellar content
Simbad objects: 2
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