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Measuring star formation in high-z massive galaxies: a mid-infrared to submillimetre study of the GOODS NICMOS Survey sample

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Pérez González, Pablo Guillermo and otros, ... (2012) Measuring star formation in high-z massive galaxies: a mid-infrared to submillimetre study of the GOODS NICMOS Survey sample. Monthly notices of the Royal Astronomical Society, 421 (3). pp. 2161-2169. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2012.20456.x




Abstract

We present measurements of the mean mid-infrared to submillimetre flux densities of massive (M_*≳ 10^11 M_⊙) galaxies at redshifts 1.7 < z < 2.9, obtained by stacking positions of known objects taken from the GOODS NICMOS Survey (GNS) catalogue on maps at 24 μm (Spitzer/MIPS); 70, 100 and 160 μm (Herschel/PACS); 250, 350 and 500 μm (BLAST); and 870 μm (LABOCA). A modified blackbody spectrum fit to the stacked flux densities indicates a median [interquartile] star formation rate (SFR) of SFR = 63[48, 81] M_⊙ yr^−1. We note that not properly accounting for correlations between bands when fitting stacked data can significantly bias the result. The galaxies are divided into two groups, disc-like and spheroid-like, according to their Sérsic indices, n. We find evidence that most of the star formation is occurring in n≤ 2 (disc-like) galaxies, with median [interquartile] SFR = 122[100, 150] M_⊙ yr^−1, while there are indications that the n > 2 (spheroid-like) population may be forming stars at a median [interquartile] SFR = 14[9, 20] M_⊙ yr^−1, if at all. Finally, we show that star formation is a plausible mechanism for size evolution in this population as a whole, but find only marginal evidence that it is what drives the expansion of the spheroid-like galaxies.


Item Type:Article
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© 2012 The Authors.
© 2012 Monthly Notices of the Royal Astronomical Society
© 2012 RAS.
Artículo firmado por 19 autores.
The authors would like to extend a big thanks to the LESS team for providing the 870-mu m map, and to David Frayer for the Spitzer 70-mu m map used in the first version of this paper. We would also like to thank Ian Smail, Kimberly Scott and Ivana Damjanov for constructive comments. Finally, we would like to thank Herve Aussel for his helpful advice. We acknowledge the support of NASA through grant numbers NAG5-12785, NAG5-13301 and NNGO-6GI11G, the NSF Office of Polar Programmes, the Canadian Space Agency, the Natural Sciences and Engineering Research Council (NSERC) of Canada, and the UK Science and Technology Facilities Council (STFC). This publication is based on data acquired with the Atacama Pathfinder Experiment (APEX) under programme numbers 078.F-9028(A), 079.F-9500(A), 080.A-3023(A) and 081.F9500(A). APEX is a collaboration between the Max-Planck-Institut fur Radioastronomie, the European Southern Observatory and the Onsala Space Observatory.

Uncontrolled Keywords:Deep field-south; Stellar population synthesis; High-redshift galaxies; Size evolution; Elliptic galaxies; Flight performance; Formation history; Compact galaxies; Hubble sequence; Formation rates
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:38494
Deposited On:20 Jul 2016 17:04
Last Modified:10 Dec 2018 15:05

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