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http://hdl.handle.net/20.500.12386/29662
Title: | Deconstructing the galaxy stellar mass function with UKIDSS and CANDELS: the impact of colour, structure and environment | Authors: | Mortlock, Alice Conselice, Christopher. J. Hartley, William G. Duncan, Ken Lani, Caterina Ownsworth, Jamie R. Almaini, Omar Wel, Arjen van der Huang, Kuang-Han Ashby, Matthew L. N. Willner, S. P. FONTANA, Adriano Dekel, Avishai Koekemoer, Anton M. Ferguson, Harry C. Faber, Sandra M. Grogin, Norman A. Kocevski, Dale D. |
Issue Date: | 2015 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 447 | Issue: | 1 | First Page: | 2 | Abstract: | We combine photometry from the Ultra Deep Survey (UDS), Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) UDS and CANDELS the Great Observatories Origins Deep Survey-South (GOODS-S) surveys to construct the galaxy stellar mass function probing both the low- and high-mass end accurately in the redshift range 0.3 < z < 3. The advantages of using a homogeneous concatenation of these data sets include meaningful measures of environment in the UDS, due to its large area (0.88 deg<SUP>2</SUP>), and the high-resolution deep imaging in CANDELS (H<SUB>160</SUB> > 26.0), affording us robust measures of structural parameters. We construct stellar mass functions for the entire sample as parametrized by the Schechter function, and find that there is a decline in the values of φ and of α with higher redshifts, and a nearly constant M* up to z ̃ 3. We divide the galaxy stellar mass function by colour, structure, and environment and explore the links between environmental overdensity, morphology, and the quenching of star formation. We find that a double Schechter function describes galaxies with high Sérsic index (n > 2.5), similar to galaxies which are red or passive. The low-mass end of the n > 2.5 stellar mass function is dominated by blue galaxies, whereas the high-mass end is dominated by red galaxies. This shows that there is a possible link between morphological evolution and star formation quenching in high mass galaxies, which is not seen in lower mass systems. This in turn suggests that there are strong mass-dependent quenching mechanisms. In addition, we find that the number density of high-mass systems is elevated in dense environments, suggesting that an environmental process is building up massive galaxies quicker in over densities than in lower densities. | Acknowledgments: | AM acknowledges funding from the STFC and a European Research Council Consolidator Grant (PI: McLure). We also acknowledge funding from the Leverhulme trust. | URI: | http://hdl.handle.net/20.500.12386/29662 | URL: | https://academic.oup.com/mnras/article/447/1/2/988908 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stu2403 | Bibcode ADS: | 2015MNRAS.447....2M | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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