First Weak-lensing Results from "See Change": Quantifying Dark Matter in the Two Z>1.5 High-redshift Galaxy Clusters SPT-CL J2040-4451 and IDCS J1426+3508

We present a weak-lensing study of SPT-CLJ2040-4451 and IDCSJ1426+3508 at z=1.48 and 1.75, respectively. The two clusters were observed in our "See Change" program, a HST survey of 12 massive high-redshift clusters aimed at high-z supernova measurements and weak-lensing estimation of accurate cluster masses. We detect weak but significant galaxy shape distortions using IR images from the WFC3, which has not yet been used for weak-lensing studies. Both clusters appear to possess relaxed morphology in projected mass distribution, and their mass centroids agree nicely with those defined by both the galaxy luminosity and X-ray emission. Using an NFW profile, for which we assume that the mass is tightly correlated with the concentration parameter, we determine the masses of SPT-CL J2040-4451 and IDCS J1426+3508 to be M_{200}=8.6_{-1.4}^{+1.7}x10^14 M_sun and 2.2_{-0.7}^{+1.1}x10^14 M_sun, respectively. The weak-lensing mass of SPT-CLJ2040-4451 shows that the cluster is clearly a rare object. Adopting the central value, the expected abundance of such a massive cluster at z>1.48 is only ~0.07 in the parent 2500 sq. deg. survey. However, it is yet premature to claim that the presence of this cluster creates a serious tension with the current LCDM paradigm unless that tension will remain in future studies after marginalizing over many sources of uncertainties such as the accuracy of the mass function and the mass-concentration relation at the high mass end. The mass of IDCSJ1426+3508 is in excellent agreement with our previous ACS-based weak-lensing result while the much higher source density from our WFC3 imaging data makes the current statistical uncertainty ~40% smaller.Comment: Accepted to Ap

Graduate Sessions 8: Neil Denari

Neil Denari is the founder and principal of Neil M. Denari Architects, Inc. He was the director of SCI-Arc from 1997 to 2001 and is currently a professor in the Architecture and Urban Design Department at UCLA. His lecture at Syracuse Architecture, entitled The New Intimacy, is one of over two hundred he has given at institutions throughout France, Japan, and the United States

The Promise and Perils of CNS Drug Delivery: A Video Debate

Neurodegenerative and infectious disorders related to host genetics, aging, and environment are rapidly increasing. Drugs, vaccines, or regenerative proteins offer “real” possibilities for positively affecting disease outcomes but are limited by access across the blood-brain barrier. New developments in nanomedicine and cell based drug delivery are becoming available. These discoveries can lead to improved neurological disease outcomes. Such obstacles include the toxicities inherent in the delivery systems de novo such as immuno- and neurological dysfunctions and perturbations of blood-brain barrier function. This debate by leading experts in the field highlights the promise and perils of CNS drug delivery. Click on Supplemental HTML to watch the streaming video

Graduate Sessions 9: Keller Easterling

Keller Easterling is an architect, professor, urbanist, and writer whose books Enduring Innocence: Global Architecture and Its Political Masquerades and Organization Space: Landscapes, Highways and Houses in America offer original and provocative conflations of spatial theory and contemporary design

Graduate Sessions 7: Anthony Vidler

Anthony Vidler is Dean of the Irwin S. Chanin School of Architecture of The Cooper Union. His books include Histories of the Immediate Present, The Architectural Uncanny, Warped Space, and The Writing of the Walls

Graduate Sessions 1: Sylvia Lavin

Sylvia Lavin is Professor of Architecture at UCLA and writes widely on contemporary architecture and theory. She recently completed a year as a Getty Scholar where she was working on her next book, The Flash in the Pan and Other Forms of Architectural Contemporaneity. She is co-editor of Crib Sheets (Monacelli Press, 2005) and the author of Form Follows Libido: Architecture and Richard Neutra in a Psychoanalytic Culture (MIT Press, 2005)

Graduate Sessions 10: Preston Scott Cohen

Preston Scott Cohen, founder of Preston Scott Cohen, Inc., is the Chair of Architecture at Harvard University Graduate School of Design. He is the author of Contested Symmetries and numerous theoretical and historical essays as well as the designer of several significant cultural institutions, urban plans, and residences for which he has received awards and honors including the American Academy of Arts and Letters Award in Architecture

Shelfbreak frontal structure and processes north of Cape Hatteras in winter

Author Posting. © Sears Foundation for Marine Research, 2008. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 66 (2008): 755-799.The circulation north of Cape Hatteras is complicated by the proximity of the shelfbreak front, the Gulf Stream, and convergent shelf flow from the Middle and South Atlantic Bights. A three-week cruise in this region in January/February, 2005 was undertaken in order to study the structure of the shelfbreak front as it terminates near Cape Hatteras and to quantify the freshwater transport from the Middle Atlantic Bight shelf into the Gulf Stream. Two strongly contrasting conditions were identified. Early in the cruise, the Gulf Stream directly abutted the shelfbreak at Cape Hatteras and drove a northward flow over the continental shelf as far north as 35°45′N. All of the Middle Atlantic Bight shelf water terminated by 35°30′N. Ten days later, the Gulf Stream had moved away from the shelfbreak south of Cape Hatteras and strong winds from the north were present. During this time, the shelfbreak frontal jet was strong (maximum southward velocity of approximately 0.5 m s-1 with a Rossby number of 2) and abruptly turned eastward and offshore between 35°35′N and 35°45′N. Freshwater transport eastward from the shelfbreak jet was 7.4 mSv and southward over the shelf was 19.9 mSv, giving a total freshwater transport of 27.3 mSv. This likely represents an upper bound due to the strong wind forcing. Implications of these results for the freshwater budget of the Middle Atlantic Bight shelf, stability properties of the shelfbreak front in this region, and the formation of “Ford water” in the Gulf Stream are discussed.Support for the Rutgers satellite archive is provided by NSF, ONR and NOAA. This work was supported under NSF Grant Number OCE-0327249