SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). IV. Spatial Clustering and Halo Masses of Submillimeter Galaxies

Lim, Chen-Fatt; Chen, Chian-Chou; Smail, Ian; Wang, Wei-Hao; Tee, Wei-Leong; Scott, Douglas; Toba, Yoshiki; Chang, Yu-Yen; Ao, Yiping; Babul, Arif; Bunker, A. J.; Chapman, Scott; Clements, D. L.; Conselice, Christopher J.; Gao, Yu; Greve, T. R.; Ho, Luis C.; Hong, Sungwook E.; Hwang, Ho Seong; Koprowski, M. P.; Michałowski, M. J.; Shim, Hyunjin; Shu, Xinwen; Simpson, J. M.

doi:10.3847/1538-4357/ab8eaf

Cited by 17 publications

(15 citation statements)

References 169 publications

(259 reference statements)

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“…Dudzevičiūtė et al 2020). SMGs with flux densities > 1 mJy are relatively rare (∼ 10 −5 cMpc −3 at ∼ 2), peak at cosmic noon ( ∼ 2−3; Chapman et al 2005;Simpson et al 2014;Dudzevičiūtė et al 2020), and have large stellar masses (Swinbank et al 2004;Michałowski et al 2012;da Cunha et al 2015), halo masses (Hickox et al 2012;Chen et al 2016;An et al 2019;Lim et al 2020), gas reservoirs (Riechers et al 2010;Engel et al 2010;Carilli et al 2010;Bothwell et al 2013) and central black hole masses (Alexander et al 2008;Wang et al 2013). However, many of the details of this picture are still uncertain, and often the subject of selection and incompleteness effects.…”

Section: Introductionmentioning

confidence: 99%

Reproducing submillimetre galaxy number counts with cosmological hydrodynamic simulations

Lovell

Geach

Davé

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Matching the number counts of high-z submillimetre-selected galaxies (SMGs) has been a long-standing problem for galaxy formation models. In this paper, we use 3D dust radiative transfer to model the submm emission from galaxies in the simba cosmological hydrodynamic simulations, and compare predictions to the latest single-dish observational constraints on the abundance of 850 μm-selected sources. We find good agreement with the shape of the integrated 850 μm luminosity function, and the normalization is within 0.25 dex at >3 mJy, unprecedented for a fully cosmological hydrodynamic simulation, along with good agreement in the redshift distribution of bright SMGs. The agreement is driven primarily by simba’s good match to infrared measures of the star formation rate (SFR) function between z = 2 and 4 at high SFRs. Also important is the self-consistent on-the-fly dust model in simba, which predicts, on average, higher dust masses (by up to a factor of 2.5) compared to using a fixed dust-to-metals ratio of 0.3. We construct a light-cone to investigate the effect of far-field blending, and find that 52 per cent of sources are blends of multiple components, which makes a small contribution to the normalization of the bright end of the number counts. We provide new fits to the 850 μm luminosity as a function of SFR and dust mass. Our results demonstrate that solutions to the discrepancy between submm counts in simulations and observations, such as a top-heavy initial mass function, are unnecessary, and that submillimetre-bright phases are a natural consequence of massive galaxy evolution.

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Section: Introductionmentioning

confidence: 99%

Reproducing submillimetre galaxy number counts with cosmological hydrodynamic simulations

Lovell

Geach

Davé

et al. 2021

Monthly Notices of the Royal Astronomical Society

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“…The velocity differences between these two pairs are within 500 km s −1 . At the projected distances of 20-30 kpc, their velocity differences would suggest that these two pairs are gravitationally bound systems, assuming that SMGs as suggested by clustering analyses reside within halos with masses of ∼10 13 M (Hickox et al 2012;Chen et al 2016;Wilkinson et al 2017;An et al 2019;Lim et al 2020;Stach et al 2021). The redshift differences of the two pairs are both ∆z < 0.02, a definition adopted by some models for physically associated pairs (Hayward et al 2013;Muñoz Arancibia et al 2015).…”

Section: Physically Associated Pairsmentioning

confidence: 97%

An ALMA Spectroscopic Survey of the Brightest Submillimeter Galaxies in the SCUBA-2-COSMOS field (AS2COSPEC): Survey Description and First Results

Chen,

Liao,

Smail

et al. 2021

Preprint

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We introduce an ALMA band 3 spectroscopic survey, targeting the brightest submillimeter galaxies (SMGs) in the COSMOS field. Here we present the first results based on the 18 primary SMGs that have 870 µm flux densities of S 870 = 12.4 − 19.3 mJy and are drawn from a parent sample of 260 ALMA-detected SMGs from the AS2COSMOS survey. We detect emission lines in 17 and determine their redshifts to be in the range of z = 2 − 5 with a median of 3.2 ± 0.3. We confirm that SMGs with brighter S 870 are located at higher redshifts. The data additionally cover five fainter companion SMGs, and we obtain line detection in one. Together with previous studies, our results indicate that for SMGs that satisfy our selection, their brightest companion SMGs are physically associated with their corresponding primary SMGs in ≥ 40% of the time, suggesting that mergers play a role in the triggering of star formation. By modeling the foreground gravitational fields, < 10% of the primary SMGs can be strongly lensed with a magnification µ > 2. We determine that about 90% of the primary SMGs have lines that are better described by double Gaussian profiles, and the median separation of the two Gaussian peaks is 430±40 km s −1 . This allows estimates of an average baryon mass, which together with the line dispersion measurements puts our primary SMGs on the similar mass-σ correlation found on local early-type galaxies. Finally, the number density of our z > 4 primary SMGs is found to be 1 × 10 −6 cMpc −3 , suggesting that they can be the progenitors of z ∼ 3 − 4 massive quiescent galaxies.

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“…Second, from the point of view of large-scale spatial distribution, statistical measurements of auto-correlation functions of each population have inferred similar correlation lengths, i.e. comparable halo masses, within a wide redshift range of z ∼ 1 − 4 (Myers et al 2006;Porciani & Norberg 2006;Shen et al 2007;Hickox et al 2012;Eftekharzadeh et al 2015;Chen et al 2016a;Wilkinson et al 2017;An et al 2019;Lim et al 2020;Stach et al 2021). A certain level of overlap of the two populations in both space and time can find support from cross-correlation measurements (Wang et al 2015), however, due to low space density of both populations, detailed assessments of their environmental connections, in particular on halo scales, have been difficult.…”

Section: Introductionmentioning

confidence: 99%

A Multiwavelength Study of ELAN Environments (AMUSE$^2$): Detection of a dusty star-forming galaxy within the enormous Lyman $α$ nebula at $z=2.3$ sheds light on its origin

Chen,

Battaia,

Emonts

et al. 2021

Preprint

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We present ALMA observations on and around the radio-quiet quasar UM287 at z = 2.28. Together with a companion quasar, UM287 is believed to play a major role in powering the surrounding enormous Lyα nebula (ELAN), dubbed the Slug ELAN, that has an end-to-end size of 450 physical kpc. In addition to the quasars, we detect a new dusty star-forming galaxy (DSFG), dubbed the Slug-DSFG, in 2 mm continuum with a single emission line consistent with CO(4-3). The Slug-DSFG sits at a projected distance of 100 kpc south-east from UM287, with a systemic velocity difference of −360 ± 30 km s −1 with respect to UM287, suggesting it being a possible contributor to the powering of the Slug ELAN. With careful modeling of SED and dynamical analyses it is found that the Slug-DSFG and UM287 appear low in both gas fraction and gas-to-dust ratio, suggesting environmental effects due to the host massive halo. In addition, our Keck long-slit spectra reveal significant Lyα emissions from the Slug-DSFG, as well as a Lyα tail that starts at the location and velocity of the Slug-DSFG and extends towards the south, with a projected length of about 100 kpc. Supported by various analytical estimates we propose that the Lyα tail is a result of the Slug-DSFG experiencing ram pressure stripping. The gas mass stripped is estimated to be about 10 9 M , contributing to the dense warm/cool gas reservoir that is believed to help power the exceptional Lyα luminosity.

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SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). IV. Spatial Clustering and Halo Masses of Submillimeter Galaxies

Cited by 17 publications

References 169 publications

Reproducing submillimetre galaxy number counts with cosmological hydrodynamic simulations

Reproducing submillimetre galaxy number counts with cosmological hydrodynamic simulations

An ALMA Spectroscopic Survey of the Brightest Submillimeter Galaxies in the SCUBA-2-COSMOS field (AS2COSPEC): Survey Description and First Results

A Multiwavelength Study of ELAN Environments (AMUSE$^2$): Detection of a dusty star-forming galaxy within the enormous Lyman $α$ nebula at $z=2.3$ sheds light on its origin

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