Dust attenuation in 2 < z < 3 star-forming galaxies from deep ALMA observations of the Hubble Ultra Deep Field

被引：111

作者：

McLure, R. J. ^{[1
]}

Dunlop, J. S. ^{[1
]}

Cullen, F. ^{[1
]}

Bourne, N. ^{[1
]}

Best, P. N. ^{[1
]}

Khochfar, S. ^{[1
]}

Bowler, R. A. A. ^{[2
]}

Biggs, A. D. ^{[3
]}

Geach, J. E. ^{[4
]}

Scott, D. ^{[5
]}

Michalowski, M. J. ^{[1
,6
]}

Rujopakarn, W. ^{[7
,8
,9
]}

van Kampen, E. ^{[3
]}

Kirkpatrick, A. ^{[10
]}

Pope, A. ^{[11
]}

机构：

[1] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland

[2] Univ Oxford, Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[3] European Southern Observ, Kart Schwarzchild Str 2, D-95748 Garching, Germany

[4] Univ Hertfordshire, Sci & Technol Res Inst, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England

[5] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[6] Adam Mickiewicz Univ, Fac Phys, Astron Observ Inst, Ul Sloneczna 36, PL-60286 Poznan, Poland

[7] Chulalongkorn Univ, Fac Sci, Dept Phys, 254 Phayathai Rd, Bangkok 10330, Thailand

[8] Natl Astron Res Inst Thailand, Publ Org, Chiang Mai 50180, Thailand

[9] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan

[10] Yale Ctr Astron & Astrophys, Dept Phys, POB 208120, New Haven, CT 06520 USA

[11] Univ Massachusetts, Dept Astron, Amherst, MA 01002 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 476卷 / 03期

基金：

英国科学技术设施理事会;

关键词：

galaxies: evolution; galaxies: high-redshift; galaxies: starburst; galaxies: star formation; submillimetre: galaxies; 1ST BILLION YEARS; ULTRAVIOLET LUMINOSITY DENSITY; FRONTIER FIELDS; STELLAR POPULATIONS; HIGH-REDSHIFT; MILKY-WAY; H-ALPHA; EXTINCTION; UV; EMISSION;

D O I：

10.1093/mnras/sty522

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the results of a new study of the relationship between infrared excess (IRX equivalent to L-IR/L-UV), ultraviolet (UV) spectral slope (beta) and stellar mass at redshifts 2 < z < 3, based on a deep Atacama Large Millimeter Array (ALMA) 1.3-mm continuum mosaic of the Hubble Ultra Deep Field. Excluding the most heavily obscured sources, we use a stacking analysis to show that z similar or equal to 2.5 star-forming galaxies in the mass range 9.25 <= log(M-*/M-circle dot) <= 10.75 are fully consistent with the IRX-beta relation expected for a relatively grey attenuation curve, similar to the commonly adopted Calzetti law. Based on a large, mass-complete sample of 2 <= z <= 3 star-forming galaxies drawn from multiple surveys, we proceed to derive a new empirical relationship between beta and stellar mass, making it possible to predict UV attenuation (A(1600)) and IRX as a function of stellar mass, for any assumed attenuation law. Once again, we find that z <= 2.5 star-forming galaxies follow A(1600)-M-* and IRX-M-* relations consistent with a relatively grey attenuation law, and find no compelling evidence that star-forming galaxies at this epoch follow a reddening law as steep as the Small Magellanic Cloud (SMC) extinction curve. In fact, we use a simple simulation to demonstrate that previous determinations of the IRX-beta relation may have been biased towards low values of IRX at red values of beta, mimicking the signature expected for an SMC-like dust law. We show that this provides a plausible mechanism for reconciling apparently contradictory results in the literature and that, based on typical measurement uncertainties, stellar mass provides a cleaner prediction of UV attenuation than beta. Although the situation at lower stellar masses remains uncertain, we conclude that for 2 < z < 3 star-forming galaxies with log(M-*/M-circle dot) >= 9.75, both the IRX-beta and IRX-M-* relations are well described by a Calzetti-like attenuation law.

引用

页码：3991 / 4006

页数：16

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