13,930 research outputs found

    On quasi-heredity and cell module homomorphisms in the symplectic blob algebra

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    This paper reports key advances in the study of the representation theory of the symplectic blob algebra. For suitable specialisations of the parameters we construct four large families of homomorphisms between cell modules. We hence find a large family of non-semisimple specialisations. We find a minimal poset (i.e. least number of relations) for the symplectic blob as a quasi-hereditary algebra.Comment: 45 pages. arXiv admin note: text overlap with arXiv:0807.410

    Disk Growth in Bulge-Dominated Galaxies: Molecular Gas and Morphological Evolution

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    Substantial numbers of morphologically regular early-type (elliptical and lenticular) galaxies contain molecular gas, and the quantities of gas are probably sufficient to explain recent estimates of the current level of star formation activity. This gas can also be used as a tracer of the processes that drive the evolution of early-type galaxies. For example, in most cases the gas is forming dynamically cold stellar disks with sizes in the range of hundreds of pc to more than one kpc, although there is typically only 1% of the total stellar mass currently available to form young stars. The numbers are still small, but the molecular kinematics indicate that some of the gas probably originated from internal stellar mass loss while some was acquired from outside. Future studies will help to quantify the role of molecular gas (dissipational processes) in the formation of early-type galaxies and their evolution along the red sequence.Comment: 4 pages. To appear in the proceedings of IAU Symposium 245, "Formation and Evolution of Galaxy Bulges," M. Bureau, E. Athanassoula, and B. Barbuy, ed

    The Kinematics of CIV in Star-Forming Galaxies at z~1.2

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    We present the first statistical sample of rest-frame far-UV spectra of star-forming galaxies at z~1. These spectra are unique in that they cover the high-ionization CIV{\lambda}{\lambda}1548, 1550 doublet. We also detect low-ionization features such as SiII{\lambda}1527, FeII{\lambda}1608, AlII{\lambda}1670, NiII{\lambda}{\lambda}1741, 1751 and SiII{\lambda}1808, and intermediate-ionization features from AlIII{\lambda}{\lambda}1854, 1862. Comparing the properties of absorption lines of lower- and higher- ionization states provides a window into the multi-phase nature of circumgalactic gas. Our sample is drawn from the DEEP2 survey and spans the redshift range 1.01 < z < 1.35 ( = 1.25). By isolating the interstellar CIV absorption from the stellar P-Cygni wind profile we find that 69% of the CIV profiles are blueshifted with respect to the systemic velocity. Furthermore, CIV shows a small but significant blueshift relative to FeII (offset of the best-fit linear regression -76 ±\pm 26 km/s). At the same time, the CIV blueshift is on average comparable to that of MgII{\lambda}{\lambda}2796, 2803. At this point, in explaining the larger blueshift of CIV absorption at the ~ 3-sigma level, we cannot distinguish between the faster motion of highly-ionized gas relative to gas traced by FeII, and filling in on the red side from resonant CIV emission. We investigate how far-UV interstellar absorption kinematics correlate with other galaxy properties using stacked spectra. These stacking results show a direct link between CIV absorption and the current SFR, though we only observe small velocity differences among different ionization states tracing the outflowing ISM.Comment: 21 pages, 14 figures, ApJ, accepte

    Editorial: Sustainable Democracy, Development and Environmental Policies

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    Urbanisation, climate change, footloose economies, multi-culturality and resource constraints pose unprecedented challenges for local governments today. In the developing world the gulf between needs and finance remains acute. Many western countries forced to reduce public spending in the wake of the sovereign debt crisis, are struggling to reconcile the need for efficiency savings with local pressure to maintain service standards and working conditions. This special double issue of the journal features a selection of papers presented at the third Commonwealth Local Government Research Colloquium held in Cardiff on 13-15 March 2011 which explored these and other important contemporary challenges. Hosted by the School of City and Regional Planning and the Centre for Local and Regional Government Research at Cardiff University, the colloquium provided a valuable opportunity for scholars from across the Commonwealth to present research on three key themes: sustainable democracy and governance, sustainable economic development and environmental sustainability

    Dead ends and possibilities: potters - the work of Martin Lungley and Ashley Howard prompts Alison Britton to reconsider the role of the wheel in contemporary studio pottery

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    Article published in Ceramic Review 210 November/December 2004 p. 24-25 This article is an edited extract from the fully illustrated catalogue 'Full Circle' which was produced to accompany the touring exhibition of the same name during 2005
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