期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 421, 期 3, 页码 2161-2169出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2012.20456.x
关键词
galaxies: evolution; galaxies: high-redshift; infrared: galaxies
资金
- NASA [NAG5-12785, NAG5-13301, NNGO-6GI11G]
- NSF Office of Polar Programmes
- Canadian Space Agency
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- UK Science and Technology Facilities Council (STFC)
- Atacama Pathfinder Experiment (APEX) [078.F-9028, 079.F-9500, 080.A-3023, 081.F9500]
- STFC [ST/I001212/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001212/1] Funding Source: researchfish
We present measurements of the mean mid-infrared to submillimetre flux densities of massive (M greater than or similar to 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 m (Spitzer/MIPS); 70, 100 and 160 m (Herschel/PACS); 250, 350 and 500 m (BLAST); and 870 m (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 circle dot 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 Sersic 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 circle dot 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 circle dot 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.
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