LSST Science Book, Version 2.0

A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of the exciting science opportunities of the next decade. The Large Synoptic Survey Telescope (LSST) will have an effective aperture of 6.7 meters and an imaging camera with field of view of 9.6 deg^2, and will be devoted to a ten-year imaging survey over 20,000 deg^2 south of +15 deg. Each pointing will be imaged 2000 times with fifteen second exposures in six broad bands from 0.35 to 1.1 microns, to a total point-source depth of r~27.5. The LSST Science Book describes the basic parameters of the LSST hardware, software, and observing plans. The book discusses educational and outreach opportunities, then goes on to describe a broad range of science that LSST will revolutionize: mapping the inner and outer Solar System, stellar populations in the Milky Way and nearby galaxies, the structure of the Milky Way disk and halo and other objects in the Local Volume, transient and variable objects both at low and high redshift, and the properties of normal and active galaxies at low and high redshift. It then turns to far-field cosmological topics, exploring properties of supernovae to z~1, strong and weak lensing, the large-scale distribution of galaxies and baryon oscillations, and how these different probes may be combined to constrain cosmological models and the physics of dark energy.Comment: 596 pages. Also available at full resolution at http://www.lsst.org/lsst/sciboo

A very energetic supernova associated with the gamma-ray burst of 29 March 2003

Over the past five years evidence has mounted that long-duration (> 2 s) gamma-ray bursts (GRBs)--the most brilliant of all astronomical explosions--signal the collapse of massive stars in our Universe. This evidence was originally based on the probable association of one unusual GRB with a supernova, but now includes the association of GRBs with regions of massive star formation in distant galaxies, the appearance of supernova-like 'bumps' in the optical afterglow light curves of several bursts and lines of freshly synthesized elements in the spectra of a few X-ray afterglows. These observations support, but do not yet conclusively demonstrate, the idea that long-duration GRBs are associated with the deaths of massive stars, presumably arising from core collapse. Here we report evidence that a very energetic supernova (a hypernova) was temporally and spatially coincident with a GRB at redshift z = 0.1685. The timing of the supernova indicates that it exploded within a few days of the GRB, strongly suggesting that core-collapse events can give rise to GRBs, thereby favouring the 'collapsar' model.Comment: 19 pages, 3 figure

Very Early Optical Afterglows of Gamma-Ray Bursts: Evidence for Relative Paucity of Detection

Very early observations with the Swift satellite of gamma-ray burst (GRB) afterglows reveal that the optical component is not detected in a large number of cases. This is in contrast to the bright optical flashes previously discovered in some GRBs (e.g. GRB 990123 and GRB 021211). Comparisons of the X-ray afterglow flux to the optical afterglow flux and prompt gamma-ray fluence is used to quantify the seemingly deficient optical, and in some cases X-ray, light at these early epochs. This comparison reveals that some of these bursts appear to have higher than normal gamma-ray efficiencies. We discuss possible mechanisms and their feasibility for explaining the apparent lack of early optical emission. The mechanisms considered include: foreground extinction, circumburst absorption, Ly-alpha blanketing and absorption due to high redshift, low density environments, rapid temporal decay, and intrinsic weakness of the reverse shock. Of these, foreground extinction, circumburst absorption, and high redshift provide the best explanations for most of the non-detections in our sample. There is tentative evidence of suppression of the strong reverse shock emission. This could be because of a Poynting-flux-dominated flow or a pure non-relativistic hydrodynamical reverse shock.Comment: 22 pages, 5 figures. Accepted for publication in Ap

Manchus and Han

China�s 1911�12 Revolution, which overthrew a 2000-year succession of dynasties, is thought of primarily as a change in governmental style, from imperial to republican, traditional to modern. But given that the dynasty that was overthrown�the Qing�was that of a minority ethnic group that had ruled China�s Han majority for nearly three centuries, and that the revolutionaries were overwhelmingly Han, to what extent was the revolution not only anti-monarchical, but also anti-Manchu?Edward Rhoads explores this provocative and complicated question in Manchus and Han, analyzing the evolution of the Manchus from a hereditary military caste (the �banner people�) to a distinct ethnic group and then detailing the interplay and dialogue between the Manchu court and Han reformers that culminated in the dramatic changes of the early 20th century.Until now, many scholars have assumed that the Manchus had been assimilated into Han culture long before the 1911 Revolution and were no longer separate and distinguishable. But Rhoads demonstrates that in many ways Manchus remained an alien, privileged, and distinct group. Manchus and Han is a pathbreaking study that will forever change the way historians of China view the events leading to the fall of the Qing dynasty. Likewise, it will clarify for ethnologists the unique origin of the Manchus as an occupational caste and their shifting relationship with the Han, from border people to rulers to ruled.Winner of the Joseph Levenson Book Prize for Modern China, sponsored by The China and Inner Asia Council of the Association for Asian Studie

Manchus and Han: Ethnic Relations and Political Power in Late Qing and Early Republican China, 1861-1928

China's 1911-12 Revolution, which overthrew a 2000-year succession of dynasties, is thought of primarily as a change in governmental style, from imperial to republican, traditional to modern. But given that the dynasty that was overthrown—the Qing—was that of a minority ethnic group that had ruled China's Han majority for nearly three centuries, and that the revolutionaries were overwhelmingly Han, to what extent was the revolution not only anti-monarchical, but also anti-Manchu? Edward Rhoads explores this provocative and complicated question in Manchus and Han, analyzing the evolution of the Manchus from a hereditary military caste (the "banner people") to a distinct ethnic group and then detailing the interplay and dialogue between the Manchu court and Han reformers that culminated in the dramatic changes of the early 20th century. Until now, many scholars have assumed that the Manchus had been assimilated into Han culture long before the 1911 Revolution and were no longer separate and distinguishable. But Rhoads demonstrates that in many ways Manchus remained an alien, privileged, and distinct group. Manchus and Han is a pathbreaking study that will forever change the way historians of China view the events leading to the fall of the Qing dynasty. Likewise, it will clarify for ethnologists the unique origin of the Manchus as an occupational caste and their shifting relationship with the Han, from border people to rulers to ruled. Winner of the Joseph Levenson Book Prize for Modern China, sponsored by The China and Inner Asia Council of the Association for Asian StudiesThe Transformation Fund of the Kenneth S. and Faye G. Allen Library Endowment at the University of Washington Librarie

Report of the ad hoc Task Force on Asian American Studies

Asian American Studie