Uncovering the stellar structure of the dusty star-forming galaxy GN20 at z=4.055 with MIRI/JWST

被引：16

作者：

Colina, L. ^{[1
]}

Gomez, A. Crespo ^{[1
]}

Alvarez-Marquez, J. ^{[1
]}

Bik, A. ^{[2
]}

Walter, F. ^{[3
]}

Boogaard, L. ^{[3
]}

Labiano, A. ^{[1
,4
]}

Peissker, F. ^{[5
]}

Perez-Gonzalez, P. ^{[1
]}

Ostlin, G. ^{[2
]}

Greve, T. R. ^{[6
,7
,8
]}

Norgaard-Nielsen, H. U. ^{[6
]}

Wright, G. ^{[9
]}

Alonso-Herrero, A. ^{[10
]}

Azollini, R. ^{[1
,11
]}

Caputi, K. I. ^{[7
,12
]}

Dicken, D. ^{[9
]}

Garcia-Marin, M. ^{[13
]}

Hjorth, J. ^{[14
]}

Ilbert, O. ^{[15
]}

Kendrew, S. ^{[13
]}

Pye, J. P. ^{[16
]}

Tikkanen, T. ^{[16
]}

van der Werf, P. ^{[17
]}

Costantin, L. ^{[1
]}

Iani, E. ^{[12
]}

Gillman, S. ^{[6
,7
]}

Jermann, I. ^{[6
,7
]}

Langeroodi, D. ^{[14
]}

Moutard, T. ^{[15
]}

Rinaldi, P. ^{[12
]}

Topinka, M. ^{[11
]}

van Dishoeck, E. F. ^{[17
]}

Guedel, M. ^{[3
,19
,20
]}

Henning, Th. ^{[3
]}

Lagage, P. O. ^{[21
]}

Ray, T. ^{[11
]}

Vandenbussche, B. ^{[18
,22
]}

机构：

[1] CSIC INTA, Ctr Astrobiol CAB, Ctra Ajalvir km 4, Madrid 28850, Spain

[2] Stockholm Univ, AlbaNova Univ Ctr, Oscar Klein Ctr, Dept Astron, S-10691 Stockholm, Sweden

[3] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[4] ESAC, Telespazio UK European Space Agcy, Camino Bajo del Castillo S-N, Villanueva De La Canada 28692, Spain

[5] Univ Cologne, Phys Inst 1, Zulpicher Str 77, D-50937 Cologne, Germany

[6] Tech Univ Denmark, DTU Space, Elektrovej 327, DK-2800 Lyngby, Denmark

[7] Cosm Dawn Ctr DAWN, Copenhagen, Denmark

[8] UCL, Dept Phys & Astron, Gower Pl, London WC1E 6BT, England

[9] Royal Observ Edinburgh, UK Astron Technol Ctr, Blackford Hill, Edinburgh EH9 3HJ, Scotland

[10] CSIC INTA, Ctr Astrobiol CAB, Camino Viejo del Castillo S-N, Madrid 28692, Spain

[11] Dublin Inst Adv Studies, Astron & Astrophys Sect, 31 Fitzwilliam Pl, Dublin 2, Ireland

[12] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands

[13] European Space Agcy, Space Telescope Sci Inst, Baltimore, MD USA

[14] Univ Copenhagen, Niels Bohr Inst, DARK, Jagtvej 128, DK-2200 Copenhagen, Denmark

[15] Aix Marseille Univ, CNRS, LAM Lab Astrophys Marseille, UMR 7326, F-13388 Marseille, France

[16] Univ Leicester, Space Res Ctr, Sch Phys & Astron, Space Pk Leicester,92 Corp Rd, Leicester LE4 5SP, England

[17] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[18] Univ Durham, Ctr Extragalact Astron, South Rd, Durham DH1 3LE, England

[19] Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria

[20] Swiss Fed Inst Technol, Inst Particle Phys & Astrophys, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

[21] Univ Paris Saclay, Univ Paris Diderot, Sorbonne Paris Cite, AIM,CEA,CNRS, F-91191 Gif Sur Yvette, France

[22] Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D Bus 2401, B-3001 Leuven, Belgium

来源：

ASTRONOMY & ASTROPHYSICS | 2023年 / 673卷

基金：

英国科学技术设施理事会; 荷兰研究理事会; 美国国家航空航天局; 新加坡国家研究基金会;

关键词：

infrared: galaxies; galaxies: high-redshift; galaxies: individual: GN20; galaxies: starburst; WEBB-SPACE-TELESCOPE; SUBMILLIMETER GALAXIES; MIDINFRARED INSTRUMENT; PROTO-CLUSTER; EVOLUTION; STARBURST; QUIESCENT; MORPHOLOGY; COMPACT; II;

D O I：

10.1051/0004-6361/202346535

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Luminous infrared galaxies at high redshifts (z > 4) include extreme starbursts that build their stellar mass over short periods of time, that is, of 100 Myr or less. These galaxies are considered to be the progenitors of massive quiescent galaxies at intermediate redshifts (z similar to 2) but their stellar structure and buildup is unknown. Here, we present the first spatially resolved near-infrared (rest-frame 1.1 mu m) imaging of GN20, one of the most luminous dusty star-forming galaxies known to date, observed at an epoch when the Universe was only 1.5 Gyr old. The 5.6 mu m image taken with the JWST Mid-Infrared Instrument (MIRI/JWST) shows that GN20 is a very luminous galaxy (M-1.1 mu m,M- AB = 25.01, uncorrected for internal extinction), with a stellar structure composed of a conspicuous central source and an extended envelope. The central source is an unresolved nucleus that carries 9% of the total flux. The nucleus is co-aligned with the peak of the cold dust emission, and offset by 3.9 kpc from the ultraviolet stellar emission. The diffuse stellar envelope is similar in size (3.6 kpc effective radius) to the clumpy CO molecular gas distribution. The centroid of the stellar envelope is offset by 1 kpc from the unresolved nucleus, suggesting GN20 is involved in an interaction or merger event supported by its location as the brightest galaxy in a proto-cluster. Additional faint stellar clumps appear to be associated with some of the UV- and CO-clumps. The stellar size of GN20 is larger by a factor of about 3 to 5 than known spheroids, disks, and irregulars at z similar to 4, while its size and low Sersic index are similar to those measured in dusty, infrared luminous galaxies at redshift 2 of the same mass (similar to 10(11) M-circle dot). GN20 has all the ingredients necessary for evolving into a massive spheroidal quiescent galaxy at intermediate redshift: it is a large, luminous galaxy at z = 4.05 involved in a short and massive starburst centred in the stellar nucleus and extended over the entire galaxy, out to radii of 4 kpc, and likely induced by the interaction or merger with a member of the proto-cluster.

引用

页数：7

共 34 条

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