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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: 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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