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• W4310648984 endingPage "728" @default.
• W4310648984 startingPage "709" @default.
• W4310648984 abstract "ABSTRACT We present Submillimeter Common User Bolometer Array 2 (SCUBA-2) and Submillimeter Array (SMA) follow-up observations of four candidate high-redshift dusty star-forming galaxies, selected as sources with rising spectral energy distributions in the 250, 350, and 500 μm Herschel SPIRE bands. Previous SMA observations showed no counterparts to these sources, but in our deeper sub-mm observations we detect counterparts to all four 500 μm risers, with three resolving into multiple systems. For these three multiple systems, the SMA 345 GHz (≈870 μm) observations recover $123 pm 73{{ rm per cent}}$, $60 pm 15{{ rm per cent}}$, and $19 pm 4{{ rm per cent}}$ of the integrated 850 μm flux density from SCUBA-2, indicating that there may be additional sources below our SMA detection limit making up a dense, protocluster core. The fourth 500 μm riser was observed at a lower frequency and so we cannot make a similar comparison. We estimate photometric redshifts based on FIR/sub-mm colours, finding that three fourths likely lie at z ≥ 2. This fits with the interpretation that the 500 μm riser selection criterion selects both intrinsically red, individual galaxies at z &gt; 4, and multiple systems at more moderate redshifts, artificially reddened by the effects of blending. We use the SCUBA-2 850 μm maps to investigate the environments of these 500 μm risers. By constructing cumulative number counts and estimating photometric redshifts for surrounding SCUBA-2 detections, we find that one of our 500 μm risers could plausibly reside in a z ≥ 2 protocluster. We infer that bright 500 μm risers with faint 850 μm flux densities are typically multiple systems at z ≥ 2 that may reside in overdensities of bright sub-mm galaxies." @default.
• W4310648984 created "2022-12-14" @default.
• W4310648984 creator A5003529676 @default.
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• W4310648984 creator A5026859867 @default.
• W4310648984 creator A5028644128 @default.
• W4310648984 creator A5045552306 @default.
• W4310648984 creator A5052048374 @default.
• W4310648984 creator A5060434425 @default.
• W4310648984 creator A5085510360 @default.
• W4310648984 date "2022-11-28" @default.
• W4310648984 modified "2023-10-17" @default.
• W4310648984 title "The nature of 500 micron risers – II. Multiplicities and environments of sub-mm faint dusty star-forming galaxies" @default.
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