期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 450, 期 2, 页码 1812-1835出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv686
关键词
galaxies: high-redshift; galaxies: kinematics and dynamics; galaxies: star formation
资金
- STFC
- University of Texas at Austin
- Marie Curie Career Integration Grant [294074]
- Leverhulme Senior Fellowship
- STFC Advanced Fellowship
- STScI grants [GO-09722, GO-10491, GO-10875, GO-12166]
- STFC [ST/L000598/1, ST/L00075X/1, ST/J001333/1, ST/M001008/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000598/1, ST/L00075X/1, ST/M001008/1, ST/J001333/1] Funding Source: researchfish
We present adaptive optics-assisted integral field spectroscopy around the H alpha or H beta lines of 12 gravitationally lensed galaxies obtained with VLT/SINFONI, Keck/OSIRIS and Gemini/NIFS. We combine these data with previous observations and investigate the dynamics and star formation properties of 17 lensed galaxies at 1 < z< 4. Thanks to gravitational magnification of 1.4-90 times by foreground clusters, effective spatial resolutions of 40-700 pc are achieved. The magnification also allows us to probe lower star formation rates (SFRs) and stellar masses than unlensed samples; our target galaxies feature dust-corrected SFRs derived from H alpha or H beta emission of similar to 0.8-40M(circle dot) yr(-1), and stellar masses M-* similar to 4 x 10(8)-6 x 10(10) M-circle dot. All of the galaxies show velocity gradients, with 59 per cent consistent with being rotating discs and a likely merger fraction of 29 per cent, with the remaining 12 per cent classed as 'undetermined'. We extract 50 star-forming clumps with sizes in the range 60 pc-1 kpc from the H alpha (or H beta) maps, and find that their surface brightnesses, Sigma(clump) and their characteristic luminosities, L-0, evolve to higher luminosities with redshift. We show that this evolution can be described by fragmentation on larger scales in gas-rich discs, and is likely to be driven by evolving gas fractions.
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