The nature of giant clumps in distant galaxies probed by the anatomy of the cosmic snake

被引:104
作者
Cava, Antonio [1 ]
Schaerer, Daniel [1 ,2 ]
Richard, Johan [3 ]
Perez-Gonzalez, Pablo G. [4 ]
Dessauges-Zavadsky, Miroslava [1 ]
Mayer, Lucio [5 ,6 ]
Tamburello, Valentina [5 ,6 ]
机构
[1] Univ Geneva, Observ Geneve, 51 Ch Maillettes, CH-1290 Versoix, Switzerland
[2] IRAP, CNRS, 14 Ave E Belin, F-31400 Toulouse, France
[3] Univ Lyon 1, Ens Lyon, CNRS, Ctr Rech Astrophys Lyon,UMR5574, F-69230 St Genis Laval, France
[4] Univ Complutense Madrid, Fac CC Fis, Dept Astrofis & Ciencias Atmosfera, E-28040 Madrid, Spain
[5] Univ Zurich, Inst Computat Sci, Ctr Theoret Astrophys & Cosmol, Winterthurerstr 190, CH-8057 Zurich, Switzerland
[6] Univ Zurich, Inst Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland
基金
欧洲研究理事会; 瑞士国家科学基金会;
关键词
STAR-FORMING GALAXIES; HIGH-REDSHIFT GALAXIES; LENSING CLUSTER; EVOLUTION; DISKS; II; RESOLUTION; FEEDBACK; REGIONS; SPITZER;
D O I
10.1038/s41550-017-0295-x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Giant stellar clumps are ubiquitous in high-redshift galaxies(1,2). They are thought to play an important role in the build-up of galactic bulges(3) and as diagnostics of star formation feedback in galactic discs(4). Hubble Space Telescope (HST) blank field imaging surveys have estimated that these clumps have masses of up to 10(9.5) M-circle dot and linear sizes of greater than or similar to 1 kpc(5,6). Recently, gravitational lensing has also been used to get higher spatial resolution(7-9). However, both recent lensed observations(10,11) and models(12,13) suggest that the clumps' properties may be overestimated by the limited resolution of standard imaging techniques. A definitive proof of this observational bias is nevertheless still missing. Here we investigate directly the effect of resolution on clump properties by analysing multiple gravitationally lensed images of the same galaxy at different spatial resolutions, down to 30 pc. We show that the typical mass and size of giant clumps, generally observed at similar to 1 kpc resolution in high-redshift galaxies, are systematically overestimated. The high spatial resolution data, only enabled by strong gravitational lensing using currently available facilities, support smaller scales of clump formation by fragmentation of the galactic gas disk via gravitational instabilities.
引用
收藏
页码:76 / 82
页数:7
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