1,646 research outputs found
PHAT Stellar Cluster Survey I. Year 1 Catalog and Integrated Photometry
The Panchromatic Hubble Andromeda Treasury (PHAT) survey is an on-going
Hubble Space Telescope (HST) multi-cycle program to obtain high spatial
resolution imaging of one-third of the M31 disk at ultraviolet through
near-infrared wavelengths. In this paper, we present the first installment of
the PHAT stellar cluster catalog. When completed, the PHAT cluster catalog will
be among the largest and most comprehensive surveys of resolved star clusters
in any galaxy. The exquisite spatial resolution achieved with HST has allowed
us to identify hundreds of new clusters that were previously inaccessible with
existing ground-based surveys. We identify 601 clusters in the Year 1 sample,
representing more than a factor of four increase over previous catalogs within
the current survey area (390 arcmin^2). This work presents results derived from
the first \sim25% of the survey data; we estimate that the final sample will
include \sim2500 clusters. For the Year 1 objects, we present a catalog with
positions, radii, and six-band integrated photometry. Along with a general
characterization of the cluster luminosities and colors, we discuss the cluster
luminosity function, the cluster size distributions, and highlight a number of
individually interesting clusters found in the Year 1 search.Comment: 26 pages, 22 figures, Accepted by Ap
Brady Statute Data: Establishing Noncriminal Classifications for the Alaska Department of Public Safety
The Brady Handgun Violence Prevention Act of 1993 prohibits the purchase of firearms by persons in certain noncriminal categories. These reports describe potential data sources for the identification of mental committments, addicted substance abusers, illegal aliens, and persons who have been the subject of a domestic violence restraining order and discusses possible procedures, problems, and solutions associated with data collection for the purpose of Brady background checks. Lack of infrastructure for collecting certain types of data, incompleteness of information, and state constitutional protections, including the guarantee of privacy, are the chief obstacles to completely meeting the provisions of the Brady Act in Alaska.Bureau of Justice Statistics, United States Department of Justice
Grant No. 96-RU-RX-K026Background / Needs and Benefits / Goals and Objectives / Project Design / Findings by Classification / Conclusio
The Planck mission
These lecture from the 100th Les Houches summer school on "Post-planck
cosmology" of July 2013 discuss some aspects of the Planck mission, whose prime
objective was a very accurate measurement of the temperature anisotropies of
the Cosmic Microwave Background (CMB). We announced our findings a few months
ago, on March 21, 2013. I describe some of the relevant steps we took to
obtain these results, sketching the measurement process, how we processed the
data to obtain full sky maps at 9 different frequencies, and how we extracted
the CMB temperature anisotropies map and angular power spectrum. I conclude by
describing some of the main cosmological implications of the statistical
characteristics of the CMB we found. Of course, this is a very much shortened
and somewhat biased view of the \Planck\ 2013 results, written with the hope
that it may lead some of the students to consult the original papers.Comment: 53 p.-34 fig; for spacetime consideration, the file here is not
paying justice to the actual thing; a closer approximation of it can be found
at
https://www.researchgate.net/profile/Francois_Bouchet/publication/262004262_The_Planck_Mission/file/e0b495363b042e81dd.pd
The Panchromatic Hubble Andromeda Treasury
The Panchromatic Hubble Andromeda Treasury (PHAT) is an on-going HST
Multicycle Treasury program to image ~1/3 of M31's star forming disk in 6
filters, from the UV to the NIR. The full survey will resolve the galaxy into
more than 100 million stars with projected radii from 0-20 kpc over a
contiguous 0.5 square degree area in 828 orbits, producing imaging in the F275W
and F336W filters with WFC3/UVIS, F475W and F814W with ACS/WFC, and F110W and
F160W with WFC3/IR. The resulting wavelength coverage gives excellent
constraints on stellar temperature, bolometric luminosity, and extinction for
most spectral types. The photometry reaches SNR=4 at F275W=25.1, F336W=24.9,
F475W=27.9, F814W=27.1, F110W=25.5, and F160W=24.6 for single pointings in the
uncrowded outer disk; however, the optical and NIR data are crowding limited,
and the deepest reliable magnitudes are up to 5 magnitudes brighter in the
inner bulge. All pointings are dithered and produce Nyquist-sampled images in
F475W, F814W, and F160W. We describe the observing strategy, photometry,
astrometry, and data products, along with extensive tests of photometric
stability, crowding errors, spatially-dependent photometric biases, and
telescope pointing control. We report on initial fits to the structure of M31's
disk, derived from the density of RGB stars, in a way that is independent of
the assumed M/L and is robust to variations in dust extinction. These fits also
show that the 10 kpc ring is not just a region of enhanced recent star
formation, but is instead a dynamical structure containing a significant
overdensity of stars with ages >1 Gyr. (Abridged)Comment: 48 pages including 22 pages of figures. Accepted to the Astrophysical
Journal Supplements. Some figures slightly degraded to reduce submission siz
Legislative Underwrites
This article introduces a widespread but virtually unacknowledged practice in Congress and state legislatures. Not only do legislatures override judicial decisions as part of an interbranch dialogue when they disagree with judicial rulings and doctrine, they also underwrite judicial decisions when they agree with those rulings. For all the literature on the adversarial communication evidenced through legislative overriding, there is not a single paper devoted to legislative underwrites that reflect more collaborative dimensions of the interbranch dialogue. This article begins to fill that void, and in so doing it frames practical and theoretical lessons for legislative, judicial, and scholarly audiences. More specifically, the article defines the contours of an underwrite and identifies the diversity of underwrite initiatives in Congress and state legislatures. It then normatively evaluates costs and benefits that might flow from a more self-conscious approach to underwrites, analyzing these pros and cons as they operate at pragmatic, doctrinal, and conceptual levels. It also examines certain vulnerabilities to the practice that may limit the scope and meaning of underwrites as applied by âdownstreamâ statutory interpreters. Finally, the article explores the interplay between underwrites and key interpretive doctrines that invoke legislative silenceânotably, statutory stare decisis and the re-enactment rule. In that connection, it suggests certain doctrinal and institutional settings in which underwrites may be especially valuable
Request for proposals for industry review
The purpose of this Request for Proposals (RFP) is to select a Proposer to perform the Project services described in this RFP. SCDOT desires that this Project be constructed in a very efficient and timely manner. This proposal is for a design-build project for an emergency bridge project for Anderson and York Counties
Planck 2013 results. VI. High Frequency Instrument data processing
We describe the processing of the 531 billion raw data samples from the High Frequency Instrument (hereafter HFI), which we performed to produce six temperature maps from the first 473 days of Planck-HFI survey data. These maps provide an accurate rendition of the sky emission at 100, 143, 217, 353, 545, and 857 GHz with an angular resolution ranging from 9.7 to 4.6 arcmin. The detector noise per (effective) beam solid angle is respectively, 10, 6, 12 and 39 microKelvin in HFI four lowest frequency channel (100--353 GHz) and 13 and 14 kJy/sr for the 545 and 857 GHz channels. Using the 143 GHz channel as a reference, these two high frequency channels are intercalibrated within 5% and the 353 GHz relative calibration is at the percent level. The 100 and 217 GHz channels, which together with the 143 GHz channel determine the high-multipole part of the CMB power spectrum (50 < l <2500), are intercalibrated at better than 0.2 %
Request for proposals final with addendum 1
The purpose of this Request for Proposals (RFP) is to select a Proposer to perform the Project services described in this RFP. SCDOT desires that this Project be constructed in a very efficient and timely manner. This proposal is for a design-build project for a Closed and Load Restricted Bridge Package for Abbeville, Greenwood, Laurens, McCormick, Newberry, and Saluda Counties
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