An ALMA survey of the SCUBA-2 cosmology legacy survey UKIDSS/UDS field: Dust attenuation in high-redshift Lyman-break galaxies

被引：0

作者：

Koprowski M.P. ^{[1
,2
]}

Coppin K.E.K. ^{[1
]}

Geach J.E. ^{[1
]}

Dudzeviciute U. ^{[3
]}

Smail I. ^{[3
]}

Almaini O. ^{[4
]}

An F. ^{[3
]}

Blain A.W. ^{[5
]}

Chapman S.C. ^{[6
]}

Chen C.-C. ^{[7
,8
]}

Conselice C.J. ^{[4
]}

Dunlop J.S. ^{[9
]}

Farrah D. ^{[10
,11
]}

Gullberg B. ^{[3
]}

Hartley W. ^{[12
,13
]}

Ivison R.J. ^{[7
,9
]}

Karska A. ^{[2
]}

Maltby D. ^{[4
]}

Malek K. ^{[14
,15
]}

Michalowski M.J. ^{[16
]}

Pope A. ^{[17
]}

Salim S. ^{[18
]}

Scott D. ^{[19
]}

Simpson C.J. ^{[20
]}

Simpson J.M. ^{[21
]}

Swinbank A.M. ^{[3
]}

Thomson A.P. ^{[22
]}

Wardlow J.L. ^{[23
]}

van der Werf P.P. ^{[24
]}

Whitaker K.E.

机构：

[1] Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield

[2] Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, Torun

[3] Centre for Extragalactic Astronomy, Department of Physics, Durham University, Durham

[4] School of Physics and Astronomy, University of Nottingham, University Park, Nottingham

[5] Physics&Astronomy, University of Leicester, 1 University Road, Leicester

[6] Department of Physics and Atmospheric Science, Dalhousie University, Halifax, B3H 4R2, NS

[7] European Southern Observatory, Karl Schwarzschild Strasse 2, Garching

[8] Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), No. 1 Section 4, Roosevelt Rd., Taipei

[9] Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh

[10] Department of Physics and Astronomy, University of Hawaii, 2505 Correa Road, Honolulu, 96822, HI

[11] Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, 96822, HI

[12] Department of Physics and Astronomy, University College London, London

[13] Department of Physics, ETH Zurich, Wolfgang-PauliStrasse 16, Zurich

[14] National Centre for Nuclear Research, ul. Pasteura 7, Warsaw

[15] Aix Marseille Univ, CNRS, CNES, LAM, Marseille

[16] Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Sloneczna 36, Poznan

[17] Department of Astronomy, University of Massachusetts, Amherst, 01003, MA

[18] Department of Astronomy, Indiana University, Bloomington, 47404

[19] Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver

[20] Gemini Observatory, Northern Operations Center, 670 N. A'ohuku Place, Hilo, 96720, HI

[21] Academia Sinica Institute of Astronomy and Astrophysics, No. 1, Section 4, Roosevelt Rd., Taipei

[22] The University of Manchester, Jodrell Bank Centre for Astrophysics, Oxford Road, Manchester

[23] Department of Physics, Lancaster University, Lancaster

[24] Leiden Observatory, Leiden University, P.O. Box 9513, Leiden

来源：

Koprowski, M.P. (mkoprowski@fizyka.umk.pl) | 1600年 / Oxford University Press卷 / 492期

基金：

英国科研创新办公室; 英国科学技术设施理事会; 美国国家航空航天局;

关键词：

Cosmology: Observations; Dust; extinction; Galaxies: Evolution; Galaxies: High-redshift; Galaxies: ISM; Galaxies: Star formation;

D O I：

10.1093/MNRAS/STAA160

中图分类号：

学科分类号：

摘要：

We analyse 870 ∼m Atacama Large Millimetre Array (ALMA) dust continuum detections of 41 canonically selected z3 Lyman-break galaxies (LBGs), aswell as 209 ALMA-undetected LBGs, in follow-up of SCUBA-2 mapping of the UKIDSS Ultra Deep Survey (UDS) field. We find that our ALMA-bright LBGs lie significantly off the local IRX-beta relation and have relatively bluer rest-frame UV slopes (as parametrized by β), given their high values of the 'infrared excess' (IRX LIR/LUV), relative to the average 'local' IRX-β relation. We attribute this finding in part to the young ages of the underlying stellar populations but we find that the main reason behind the unusually blue UV slopes are the relatively shallow slopes of the corresponding dust attenuation curves. We show that, when stellar masses, M∗, are being established via SED fitting, it is absolutely crucial to allow the attenuation curves to vary (rather than fixing it on Calzetti-like law), where we find that the inappropriate curves may underestimate the resulting stellar masses by a factor of 2-3× on average. In addition, we find these LBGs to have relatively high specific star-formation rates (sSFRs), dominated by the dust component, as quantified via the fraction of obscured star formation (fobs SFRIR/SFRUV+IR). We conclude that the ALMA-bright LBGs are, by selection, massive galaxies undergoing a burst of a star formation (large sSFRs, driven, for example, by secular or merger processes), with a likely geometrical disconnection of the dust and stars, responsible for producing shallow dust attenuation curves. © 2020 Oxford University Press. All rights reserved.

引用

页码：4927 / 4944

页数：17

共 28 条

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