High velocity dispersion in a rare grand-design spiral galaxy at redshift z = 2.18 |
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| Authors: | David R Law Alice E Shapley Charles C Steidel Naveen A Reddy Charlotte R Christensen Dawn K Erb |
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| Institution: | Dunlap Institute for Astronomy & Astrophysics, University of Toronto, 50 St George Street, Toronto M5S 3H4, Ontario, Canada. drlaw@di.utoronto.ca |
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| Abstract: | Although grand-design spiral galaxies are relatively common in the local Universe, only one has been spectroscopically confirmed to lie at redshift z?>?2 (HDFX 28; z = 2.011); and it may prove to be a major merger that simply resembles a spiral in projection. The rarity of spirals has been explained as a result of disks being dynamically 'hot' at z?>?2 (refs 2-5), which may instead favour the formation of commonly observed clumpy structures. Alternatively, current instrumentation may simply not be sensitive enough to detect spiral structures comparable to those in the modern Universe. At z?
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