ALMA 200 pc Resolution Imaging of Smooth Cold Dusty Disks in Typical z ∼ 3 Star-forming Galaxies

被引：54

作者：

Rujopakarn, W. ^{[1
,2
,3
]}

Daddi, E. ^{[4
]}

Rieke, G. H. ^{[5
]}

Puglisi, A. ^{[4
]}

Schramm, M. ^{[6
]}

Perez-Gonzalez, P. G. ^{[7
]}

Magdis, G. E. ^{[8
,9
,10
]}

Alberts, S. ^{[5
]}

Bournaud, F. ^{[4
]}

Elbaz, D. ^{[4
]}

Franco, M. ^{[4
]}

Kawinwanichakij, L. ^{[3
]}

Kohno, K. ^{[11
,12
]}

Narayanan, D. ^{[8
,13
,14
]}

Silverman, J. D. ^{[3
]}

Wang, T. ^{[6
,11
,12
]}

Williams, C. C. ^{[5
]}

机构：

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

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

[3] Univ Tokyo, Kavli IPMU WPI, UTIAS, Kashiwa, Chiba 2778583, Japan

[4] Univ Paris, Univ Paris Saclay, Sorbonne Paris Cite, CEA,IRFU,DAp,AIM,CNRS, F-91191 Gif Sur Yvette, France

[5] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[6] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[7] CSIC INTA, CAB, Ctr Astrobiol, Carretera Ajalvir Km 4, E-28850 Madrid, Spain

[8] Univ Copenhagen, Cosm Dawn Ctr, Niels Bohr Inst, Juliane Mariesvej 30, DK-2100 Copenhagen, Denmark

[9] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark

[10] Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Athens 15236, Greece

[11] Univ Tokyo, Inst Astron, Mitaka, Tokyo 1810015, Japan

[12] Univ Tokyo, Res Ctr Early Universe, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[13] Univ Florida, Dept Astron, 211 Bryant Space Sci Ctr, Gainesville, FL 32611 USA

[14] Univ Florida, Informat Inst, 432 Newell Dr,CISE Bldg E251, Gainesville, FL 32611 USA

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 882卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: star formation; galaxies: structure; GRAVITATIONALLY LENSED GALAXIES; STELLAR POPULATION SYNTHESIS; ULTRA DEEP FIELD; HIGH-REDSHIFT; GIANT CLUMPS; RESOLVED SPECTROSCOPY; PHYSICAL-PROPERTIES; DISTANT GALAXIES; FORMATION RATES; HUBBLE-DEEP;

D O I：

10.3847/1538-4357/ab3791

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present high-fidelity, 30 mas (200 pc) resolution ALMA rest-frame 240 mu m observations of cold dust emission in three typical main-sequence star-forming galaxies (SFGs) at z similar to 3 in the Hubble Ultra-Deep Field (HUDF). The cold dust is distributed within the smooth disklike central regions of star formation 1-3 kpc in diameter, despite their complex and disturbed rest-frame UV and optical morphologies. No dust substructures or clumps are seen down to similar or equal to 1-3 M-circle dot yr(-1) (1 sigma) per 200 pc beam. No dust emission is observed at the locations of UV-emitting clumps, which lie similar or equal to 2-10 kpc from the bulk of star formation. Clumpy substructures can contribute no more than 1%-7% of the total star formation in these galaxies (3 sigma upper limits). The lack of star-forming substructures in our HUDF galaxies is to be contrasted with the multiple substructures characteristic of submillimeter-selected galaxies (SMGs) at the same cosmic epoch, particularly the far-IR-bright SMGs with similarly high-fidelity ALMA observations of Hodge et al. Individual star-forming substructures in these SMGs contain similar to 10%-30% of their total star formation. A substructure in these SMGs is often comparably bright in the far-infrared to (or in some cases brighter than) our typical SFGs, suggesting that these SMGs originate from a class of disruptive events involving multiple objects at the scale of our HUDF galaxies. The scale of the disruptive event found in our main-sequence SFGs, characterized by the lack of star-forming substructures at our resolution and sensitivity, could be less violent, e.g., gas-rich disk instability or minor mergers.

引用

页数：20

共 165 条

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