期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 444, 期 4, 页码 3340-3356出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1603
关键词
galaxies: elliptical and lenticular, cD; galaxies: structure
资金
- UK Research Councils [PP/E001114/1, ST/H002456/1, PPA/V/S/2002/00553, PP/E001564/1, ST/H504862/1]
- Christ Church, Oxford
- Royal Society [502011.K502/jd, JP0869822]
- Royal Society
- Gemini Observatory
- DFG Cluster of Excellence 'Origin and Structure of the Universe'
- STFC [ST/F009186/1]
- NWO/Veni grant
- European Community [229517]
- European Research Council [267399-Momentum]
- NSF [AST-1109803]
- ESO
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- Science and Technology Facilities Council [ST/M001857/1, ST/F009186/1, PP/E001564/1, ST/K00106X/1, ST/K005596/1, ST/H002456/1, ST/H504862/1, PP/E001114/1] Funding Source: researchfish
- STFC [ST/M001857/1, PP/E001564/1, ST/F009186/1, ST/K005596/1, ST/H002456/1, ST/L004496/1, ST/K00106X/1, PP/E001114/1, ST/H504862/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1109803] Funding Source: National Science Foundation
We use the ATLAS(3D) sample to perform a study of the intrinsic shapes of early-type galaxies, taking advantage of the available combined photometric and kinematic data. Based on our ellipticity measurements from the Sloan Digital Sky Survey Data Release 7, and additional imaging from the Isaac Newton Telescope, we first invert the shape distribution of fast and slow rotators under the assumption of axisymmetry. The so-obtained intrinsic shape distribution for the fast rotators can be described with a Gaussian with a mean flattening of q = 0.25 and standard deviation sigma(q) = 0.14, and an additional tail towards rounder shapes. The slow rotators are much rounder, and are well described with a Gaussian with mean q = 0.63 and sigma(q) = 0.09. We then checked that our results were consistent when applying a different and independent method to obtain intrinsic shape distributions, by fitting the observed ellipticity distributions directly using Gaussian parametrizations for the intrinsic axis ratios. Although both fast and slow rotators are identified as early-type galaxies in morphological studies, and in many previous shape studies are therefore grouped together, their shape distributions are significantly different, hinting at different formation scenarios. The intrinsic shape distribution of the fast rotators shows similarities with the spiral galaxy population. Including the observed kinematic misalignment in our intrinsic shape study shows that the fast rotators are predominantly axisymmetric, with only very little room for triaxiality. For the slow rotators though there are very strong indications that they are (mildly) triaxial.
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