Red, redder, reddest: SCUBA-2 imaging of colour-selected Herschel sources

Duivenvoorden, Steven; Oliver, Seb; Scudder, Jillian M.; Greenslade, J.; Riechers, Dominik A.; Wilkins, Stephen M.; Buat, V.; Chapman, Scott; Clements, D. L.; Cooray, Asantha; Coppin, K. E. K.; Dannerbauer, H.; Zotti, G. de; Dunlop, James; Eales, Steve; Efstathiou, A.; Farrah, D.; Geach, J. E.; Holland, W. S.; Hurley, P. D.; Ivison, R. J.; Marchetti, L.; Petitpas, G.; Sargent, M.; Scott, Douglas; Symeonidis, M.; Vaccari, M.; Vieira, J. D.; Wang, L.; Wardlow, J. L.; Zemcov, M.

doi:10.1093/mnras/sty691

Cited by 29 publications

(45 citation statements)

References 97 publications

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“…If the "raw" counts are corrected for flux boosting due to instrumental noise and confusion following some recent studies (Béthermin et al 2017;Donevski et al 2018;Duivenvoorden et al 2018), consistency with predictions based on a universal "Chabrier" IMF is recovered and topheavy IMFs are disfavoured. However, definite conclusions on the abundance of z > 4 sub-mm galaxies are hampered by the large uncertainties on their selection on one side and on corrections for flux boosting on the other side.…”

Section: Discussionmentioning

confidence: 74%

High-z Dusty Star-forming Galaxies: A Top-heavy Initial Mass Function?

Cai

Zotti

Bonato

2020

ApJ

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Recent estimates point to abundances of z > 4 sub-mm galaxies far above model predictions. The matter is still debated. According to some analyses the excess may be substantially lower than initially thought and perhaps accounted for by flux boosting and source blending. However, there is no general agreement on this conclusion. An excess of z > 6 dusty galaxies has also been reported albeit with poor statistics. On the other hand, Zhang et al. (2018) reported evidence of a top-heavy initial mass function (IMF) in high-z galaxies. This would translate into higher a sub-mm luminosity of dusty galaxies at fixed star-formation rate (SFR), i.e., into a higher abundance of high-z galaxies than expected for an universal IMF. Exploiting the physical model by Cai et al. (2013) we argue that some excess can be understood in terms of a somewhat top-heavier IMF for proto-spheroidal galaxies compared to late-type galaxies. Such IMF is consistent with that advocated by Zhang et al. (2018) to account for the low 13 C/ 18 O abundance ratio measured by them in four z = 2-3 dusty galaxies. However, the IMF impact on the star formation history of galaxies is far less dramatic than suggested by these authors and extreme top-heavy IMFs are inconsistent with the data.

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Section: Discussionmentioning

confidence: 74%

High-z Dusty Star-forming Galaxies: A Top-heavy Initial Mass Function?

Cai

Zotti

Bonato

2020

ApJ

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“…Most of these galaxies have been observed at 850 µm using SCUBA-2, and only 22 sources have spectroscopic redshifts (see references in Bakx et al 2018). We note that the SCUBA-2 flux densities originally reported in Bakx et al (2018) have recently been revised using the method described in Ivison et al (2016) and Duivenvoorden et al (2018), together with the estimated photometric redshifts, as explained in an Erratum to that paper (Bakx et al, in preparation). The SCUBA-2 flux densities and the photometric redshifts z phot listed in Table 1 are the revised values.…”

Section: Sample Selectionmentioning

confidence: 91%

NOEMA redshift measurements of bright Herschel galaxies

Neri

Cox

Omont

et al. 2020

A&A

115

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Using the IRAM NOrthern Extended Millimeter Array (NOEMA), we conducted a program to measure redshifts for 13 bright galaxies detected in the Herschel Astrophysical Large Area Survey (H-ATLAS) with S 500 µm ≥ 80 mJy. We report reliable spectroscopic redshifts for 12 individual sources, which are derived from scans of the 3 and 2 mm bands, covering up to 31 GHz in each band, and are based on the detection of at least two emission lines. The spectroscopic redshifts are in the range 2.08 < z < 4.05 with a median value of z = 2.9 ± 0.6. The sources are unresolved or barely resolved on scales of 10 kpc. In one field, two galaxies with different redshifts were detected. In two cases the sources are found to be binary galaxies with projected distances of ∼140 kpc. The linewidths of the sources are large, with a mean value for the full width at half maximum of 700 ± 300 km s −1 and a median of 800 km s −1 . We analyze the nature of the sources with currently available ancillary data to determine if they are lensed or hyper-luminous (L FIR > 10 13 L ⊙ ) galaxies. We also present a reanalysis of the spectral energy distributions including the continuum flux densities measured at 3 and 2 mm to derive the overall properties of the sources. Future prospects based on these efficient measurements of redshifts of high-z galaxies using NOEMA are outlined, including a comprehensive survey of all the brightest Herschel galaxies.

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“…Photometric redshifts and integrated properties (e.g., FIR luminosities) are derived from the eazy code (Brammer et al 2008) using representative FIR/sub-mm templates. We refer the reader to Ivison et al (2016) and Duivenvoorden et al (2018) for detailed descriptions of the SCUBA-2/LABOCA observations, flux density measurements, and FIR SED fitting. We adopt the peakvalue photometry and photometric redshifts from both works (listed in Table 1).…”

Section: Spitzer Observations and Source Photometrymentioning

confidence: 99%

“…The reduced maps have an average rms noise level of 2.2 mJy/beam and the beam FWHM sizes are typically 2.5 . The flux densities at 1.1 mm are given in Duivenvoorden et al (2018) and included in the SED fitting below. The details of the observations and data reduction will be presented in Greenslade et al in prep. Additional data with MUSIC/CSO (Sayers et al 2014) and ACT (Su et al 2017) were obtained for 5 HeLMS sources (HELMS RED 1,3,4,6,7).…”

Section: Spitzer Observations and Source Photometrymentioning

confidence: 99%

“…A subset of 109 DSFGs were further selected for followup observations with SCUBA-2 (Holland et al 2013) or LABOCA (Siringo et al 2009) at longer wavelengths (850/870 µm). Asboth et al (2016) identified 477 "500 µm-risers" from the 300 deg 2 HerMES Large Mode Survey (HeLMS), and 188 of the brightest 200 (S 500 > 63 mJy) sources were followed up with SCUBA-2 (Duivenvoorden et al 2018). The addition of these longer wavelength data to the three Herschel/SPIRE bands better constrains the photometric redshifts and FIR luminosities.…”

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confidence: 99%

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Spitzer Catalog of Herschel-selected Ultrared Dusty Star-forming Galaxies

Cooray

Nayyeri

et al. 2019

ApJS

Self Cite

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The largest Herschel extragalactic surveys, H-ATLAS and HerMES, have selected a sample of "ultrared" dusty, star-forming galaxies (DSFGs) with rising SPIRE flux densities (S 500 > S 350 > S 250 ; so-called "500 µm-risers") as an efficient way for identifying DSFGs at higher redshift (z > 4). In this paper, we present a large Spitzer follow-up program of 300 Herschel ultrared DSFGs. We have obtained high-resolution ALMA, NOEMA, and SMA data for 63 of them, which allow us to securely identify the Spitzer/IRAC counterparts and classify them as gravitationally lensed or unlensed. Within the 63 ultrared sources with high-resolution data, ∼65% appear to be unlensed, and ∼27% are resolved into multiple components. We focus on analyzing the unlensed sample by directly performing multi-wavelength spectral energy distribution (SED) modeling to derive their physical properties and compare with the more numerous z ∼ 2 DSFG population. The ultrared sample has a median redshift of 3.3, stellar mass of 3.7 × 10 11 M , star formation rate (SFR) of 730 M yr −1 , total dust luminosity of 9.0 × 10 12 L , dust mass of 2.8 × 10 9 M , and V-band extinction of 4.0, which are all higher than those of the ALESS DSFGs. Based on the space density, SFR density, and stellar mass density estimates, we conclude that our ultrared sample cannot account for the majority of the star-forming progenitors of the massive, quiescent galaxies found in infrared surveys. Our sample contains the rarer, intrinsically most dusty, luminous and massive galaxies in the early universe that will help us understand the physical drivers of extreme star formation.

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Red, redder, reddest: SCUBA-2 imaging of colour-selected Herschel sources

Cited by 29 publications

References 97 publications

High-z Dusty Star-forming Galaxies: A Top-heavy Initial Mass Function?

High-z Dusty Star-forming Galaxies: A Top-heavy Initial Mass Function?

NOEMA redshift measurements of bright Herschel galaxies

Spitzer Catalog of Herschel-selected Ultrared Dusty Star-forming Galaxies

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