The SCUBA-2 Cosmology Legacy Survey: demographics of the 450-μm population

Roseboom, I. G.; Dunlop, James; Cirasuolo, M.; Smail, Ian; Halpern, M.; Werf, P. van der; Almaini, O.; Arumugam, V.; Asboth, V.; Auld, Robbie Richard; Blain, A. W.; Bremer, M. N.; Bock, J. J.; Bowler, R. A. A.; Buitrago, F.; Chapin, Edward L.; Chapman, Scott; Chrysostomou, A.; Clarke, Charlotte; Conley, A.; Coppin, K. E. K.; Danielson, A. L. R.; Farrah, D.; Glenn, J.; Hatziminaoglou, E.; Ibar, E.; Ivison, R. J.; Jenness, Tim; Kampen, E. van; Karim, A.; Mackenzie, T.; Marsden, G.; Meijerink, R.; Michałowski, M. J.; Oliver, Seb; Page, M. J.; Pearson, EA; Scott, D.; Simpson, J. M.; Smith, D. J. B.; Spaans, Marco; Swinbank, A. M.; Symeonidis, M.; Targett, T. A.; Valiante, Elisabetta; Viero, Marco P.; Wang, L.; Zemcov, Michael

doi:10.1093/mnras/stt1577

Cited by 42 publications

(53 citation statements)

References 102 publications

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“…It should be noted that this redshift distribution is significantly different than the distribution of either the 450 μm or 850 μm sources, who peak at z 1.95 0.19 450 á ñ =  and z 2.16 0.11 850 á ñ =  , respectively. The median of this parent distribution is z 1.46 0.14 á ñ =  , similar to the results of Roseboom et al (2013). We attribute this to the inclusion of the marginally detected 450 and 850 μm sources to our spectroscopic followup sample: these sources are less submillimeter luminous and so are likely at lower redshifts (see also Béthermin et al 2015).…”

Section: Photometric Redshift Analysissupporting

confidence: 75%

Near-infrared MOSFIRE Spectra of Dusty Star-forming Galaxies at 0.2 < z < 4

Casey

Cooray

Killi

et al. 2017

ApJ

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We present near-infrared and optical spectroscopic observations of a sample of 450 and 850 μm-selected dusty star-forming galaxies (DSFGs) identified in a 400 arcmin 2 area in the COSMOS field. Thirty-one sources of the 114 targets were spectroscopically confirmed at z 0.2 4 < < , identified primarily in the near-infrared with Keck MOSFIRE and some in the optical with Keck LRIS and DEIMOS. The low rate of confirmation is attributable both to high rest-frame optical obscuration in our targets and limited sensitivity to certain redshift ranges. The median spectroscopic redshift is z 1.55 0.14 spec á ñ =  , comparable to z 1.50 0.09 phot á ñ =  for the larger parent DSFG sample; the median stellar mass is 4.9 101.4The high-quality photometric redshifts available in the COSMOS field allow us to test the robustness of photometric redshifts for DSFGs. We find a subset (11 31 35 » %) of DSFGs with inaccurateor non-existent photometric redshifts; these have very distinct spectral energy distributions from the remaining DSFGs, suggesting a decoupling of highly obscured and unobscured components. We present a composite rest-frame 4300-7300 Å spectrum for DSFGs, and find evidence of 200±30 km s −1 gas outflows. Nebular line emission for a subsample of our detections indicate that hard ionizing radiation fields are ubiquitous in high-z DSFGs, even more so than typical mass or UV-selected high-z galaxies. We also confirm the extreme level of dust obscuration in DSFGs, measuring very high Balmer decrements and very high ratios of IR to UV and IR to Hα luminosities. This work demonstrates the need to broaden the use of wide bandwidth technology in the millimeter to spectroscopically confirm larger samples of high-z DSFGs, as the difficulty in confirming such sources at optical/near-infrared wavelengths is exceedingly challenging given their obscuration.

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Section: Photometric Redshift Analysissupporting

confidence: 75%

Near-infrared MOSFIRE Spectra of Dusty Star-forming Galaxies at 0.2 < z < 4

Casey

Cooray

Killi

et al. 2017

ApJ

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“…The shapes of SEDs at the FIR wavelengths (λ 60 µm) are empirically found (e.g. Magnelli et al 2012;Casey et al 2013;Roseboom et al 2013) to be fairly well represented by a single modified blackbody function:…”

Section: Dust Propertiesmentioning

confidence: 93%

“…Such 450-µm-selected galaxies occupy similar parameter spaces to 850-µm sources in infrared luminosity (L IR ), SFR, and stellar mass, with typical ranges of 10 11.5 -10 13 L , 100-1000 M yr −1 , and 10 10.5 -10 11.5 M , respectively. However, 450-µm sources have dust temperatures higher than those of 850-µm sources by roughly 10 K Roseboom et al 2013). They are also at somewhat lower redshifts, with a peak of the redshift distribution at z = 1.5-2.0, Simpson et al 2014;Bourne et al 2017;Zavala et al 2018, cf.…”

Section: Introductionmentioning

confidence: 98%

“…Lensing cluster surveys have reached intrinsic unlensed 450-µm flux densities of 1 mJy and have nearly fully resolved the 450-µm extragalactic background light (Chen et al 2013a,b;Hsu et al 2016). The physical properties of 450-µm population have been examined in several studies based on shallow 450-µm maps with noise levels of σ 450 µm = 1.0-4.2 mJy Roseboom et al 2013;Bourne et al 2017;Cowie et al 2017;Zavala et al 2018). Such 450-µm-selected galaxies occupy similar parameter spaces to 850-µm sources in infrared luminosity (L IR ), SFR, and stellar mass, with typical ranges of 10 11.5 -10 13 L , 100-1000 M yr −1 , and 10 10.5 -10 11.5 M , respectively.…”

Section: Introductionmentioning

confidence: 99%

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SCUBA-2 Ultra Deep Imaging EAO Survey (Studies). III. Multiwavelength Properties, Luminosity Functions, and Preliminary Source Catalog of 450 μm Selected Galaxies

Lim

Wang

Smail

et al. 2020

ApJ

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We construct a SCUBA-2 450-µm map in the COSMOS field that covers an area of 300 arcmin 2 and reaches a 1σ noise level of 0.65 mJy in the deepest region. We extract 256 sources detected at 450 µm with signal-to-noise ratio > 4.0 and analyze the physical properties of their multi-wavelength counterparts. We find that most of the sources are at z 3, with a median of z = 1.79 +0.03 −0.15 . About 35 +32−25 % of our sources are classified as starburst galaxies based on their total star-formation rates (SFRs) and stellar masses (M * ). By fitting the far-infrared spectral energy distributions, we find that our 450-µm-selected sample has a wide range of dust temperatures (20 K T d 60 K), with a median of T d = 38.3 +0.4 −0.9 K. We do not find a redshift evolution in dust temperature for sources with L IR > 10 12 L at z < 3. However, we find a moderate correlation where dust temperature increases with the deviation from the SFR-M * relation. The increase in dust temperature also correlates with optical morphology, which is consistent with merger-triggered starbursts in sub-millimeter galaxies. Our galaxies do not show the tight IRX-β UV correlation that has been observed in the local Universe. We construct the infrared luminosity functions of our 450-µm sources and measure their comoving SFR densities. The contribution of the L IR > 10 12 L population to the SFR density rises dramatically from z = 0 to 2 (∝ (1 + z) 3.9±1.1 ) and dominates the total SFR density at z 2.

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“…The full detailed photometry is described in U et al (2012). The COSMOS sample includes the five-band Herschel 100-500 μm data, 24-70 μm Spitzer data, and, when available, AzTEC 1.1 mm data (Scott et al 2008;Aretxaga et al 2011) as well as Scuba-2 450 μm and 850 μm data Roseboom et al 2013). We use the far-infrared SED fitting technique described by Casey (2012); this has been shown to produce L IR , T dust and M dust estimates that are more accurate (when compared to direct interpolation of data) yet fully consistent with template fitting methods popular in the literature (e.g., Chary & Elbaz 2001;Dale & Helou 2002).…”

Section: Calculationsmentioning

confidence: 99%

Characterization of electronic structure of oxysulfide buffers and band alignment at buffer/absorber interfaces in Cu(In,Ga)Se₂-based solar cells

Terada¹,

Morita²,

Chochi³

et al. 2014

Jpn. J. Appl. Phys.

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Galaxies' rest-frame ultraviolet (UV) properties are often used to directly infer the degree to which dust obscuration affects the measurement of star formation rates (SFRs). While much recent work has focused on calibrating dust attenuation in galaxies selected at rest-frame ultraviolet wavelengths, locally and at high-z, here we investigate attenuation in dusty, star forming galaxies (DSFGs) selected at far-infrared wavelengths. By combining multiwavelength coverage across 0.15-500 μm in the COSMOS field, in particular making use of Herschel imaging, and a rich data set on local galaxies, we find an empirical variation in the relationship between the rest-frame UV slope (β) and the ratio of infrared-to-ultraviolet emission (L IR /L UV ≡ IRX) as a function of infrared luminosity, or total SFR. Both locally and at high-z, galaxies above SFR 50 M yr −1 deviate from the nominal IRX-β relation toward bluer colors by a factor proportional to their increasing IR luminosity. We also estimate contamination rates of DSFGs on high-z dropout searches of 1% at z 4-10, providing independent verification that contamination from very dusty foreground galaxies is low in Lyman-break galaxy searches. Overall, our results are consistent with the physical interpretation that DSFGs, e.g., galaxies with >50 M yr −1 , are dominated at all epochs by short-lived, extreme burst events, producing many young O and B stars that are primarily, yet not entirely, enshrouded in thick dust cocoons. The blue rest-frame UV slopes of DSFGs are inconsistent with the suggestion that most DSFGs at z ∼ 2 exhibit steady-state star formation in secular disks.

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The SCUBA-2 Cosmology Legacy Survey: demographics of the 450-μm population

Cited by 42 publications

References 102 publications

Near-infrared MOSFIRE Spectra of Dusty Star-forming Galaxies at 0.2 < z < 4

Near-infrared MOSFIRE Spectra of Dusty Star-forming Galaxies at 0.2 < z < 4

SCUBA-2 Ultra Deep Imaging EAO Survey (Studies). III. Multiwavelength Properties, Luminosity Functions, and Preliminary Source Catalog of 450 μm Selected Galaxies

Characterization of electronic structure of oxysulfide buffers and band alignment at buffer/absorber interfaces in Cu(In,Ga)Se₂-based solar cells

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The SCUBA-2 Cosmology Legacy Survey: demographics of the 450-μm population

Cited by 42 publications

References 102 publications

Near-infrared MOSFIRE Spectra of Dusty Star-forming Galaxies at 0.2 < z < 4

Near-infrared MOSFIRE Spectra of Dusty Star-forming Galaxies at 0.2 < z < 4

SCUBA-2 Ultra Deep Imaging EAO Survey (Studies). III. Multiwavelength Properties, Luminosity Functions, and Preliminary Source Catalog of 450 μm Selected Galaxies

Characterization of electronic structure of oxysulfide buffers and band alignment at buffer/absorber interfaces in Cu(In,Ga)Se2-based solar cells

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Product

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Characterization of electronic structure of oxysulfide buffers and band alignment at buffer/absorber interfaces in Cu(In,Ga)Se₂-based solar cells