Search Publications
A Triple Main Sequence in the Globular Cluster NGC 2808
Anderson, J.; Milone, A. P.; Bedin, L. R. +6 more
Accurate photometry with HST's ACS shows that the main sequence (MS) of the globular cluster NGC 2808 splits into three separate branches. The three MS branches may be associated with the complexities of the cluster's horizontal branch and of its abundance distribution. We attribute the MS branches to successive rounds of star formation, with diff…
The COSMOS Survey: Hubble Space Telescope Advanced Camera for Surveys Observations and Data Processing
Kneib, J. -P.; Aussel, H.; Giavalisco, M. +11 more
We describe the details of the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) observations of the COSMOS field, including the data calibration and processing procedures. We obtained a total of 583 orbits of HST ACS/WFC imaging in the F814W filter, covering a field that is 1.64 deg2 in area, the l…
The ACS Virgo Cluster Survey. XIII. SBF Distance Catalog and the Three-dimensional Structure of the Virgo Cluster
Jordán, Andrés; Tonry, John L.; Côté, Patrick +7 more
The ACS Virgo Cluster Survey consists of HST ACS imaging for 100 early-type galaxies in the Virgo Cluster, observed in the F475W (~SDSS g) and F850LP (~SDSS z) filters. We derive distances for 84 of these galaxies using the method of surface brightness fluctuations (SBFs), present the SBF distance catalog, and use this database to examine the thre…
Scrutinizing Exotic Cosmological Models Using ESSENCE Supernova Data Combined with Other Cosmological Probes
Becker, A. C.; Sollerman, J.; Spyromilio, J. +25 more
The first cosmological results from the ESSENCE supernova survey (Wood-Vasey and coworkers) are extended to a wider range of cosmological models including dynamical dark energy and nonstandard cosmological models. We fold in a greater number of external data sets such as the recent Higher-z release of high-redshift supernovae (Riess and coworkers)…
Hard X-Ray Detector (HXD) on Board Suzaku
Isobe, Naoki; Yamaoka, Kazutaka; Fukazawa, Yasushi +66 more
The Hard X-ray Detector (HXD) on board Suzaku covers a wide energy range from 10keV to 600keV by the combination of silicon PIN diodes and GSO scintillators. The HXD is designed to achieve an extremely low in-orbit background based on a combination of new techniques, including the concept of a well-type active shield counter. With an effective are…
UV Luminosity Functions at z~4, 5, and 6 from the Hubble Ultra Deep Field and Other Deep Hubble Space Telescope ACS Fields: Evolution and Star Formation History
Franx, Marijn; Bouwens, R. J.; Illingworth, G. D. +1 more
We use the ACS BViz data from the HUDF and all other deep HST ACS fields (including the GOODS fields) to find large samples of star-forming galaxies at z~4 and ~5 and to extend our previous z~6 sample. These samples contain 4671, 1416, and 627 B-, V-, and i-dropouts, respectively, and reach to extremely low luminosities [(0.01-0.04)L*
Self-consistent Coronal Heating and Solar Wind Acceleration from Anisotropic Magnetohydrodynamic Turbulence
Cranmer, Steven R.; van Ballegooijen, Adriaan A.; Edgar, Richard J.
We present a series of models for the plasma properties along open magnetic flux tubes rooted in solar coronal holes, streamers, and active regions. These models represent the first self-consistent solutions that combine (1) chromospheric heating driven by an empirically guided acoustic wave spectrum; (2) coronal heating from Alfvén waves that hav…
Solar and interplanetary sources of major geomagnetic storms (Dst <= -100 nT) during 1996-2005
Thompson, B. J.; Webb, D. F.; Zhukov, A. N. +9 more
We present the results of an investigation of the sequence of events from the Sun to the Earth that ultimately led to the 88 major geomagnetic storms (defined by minimum Dst ≤ -100 nT) that occurred during 1996-2005. The results are achieved through cooperative efforts that originated at the Living with a Star (LWS) Coordinated Data-Analysis Works…
The All-Wavelength Extended Groth Strip International Survey (AEGIS) Data Sets
Smail, I.; Le Floc'h, E.; Barmby, P. +53 more
In this the first of a series of Letters, we present a panchromatic data set in the Extended Groth Strip region of the sky. Our survey, the All-Wavelength Extended Groth Strip International Survey (AEGIS), aims to study the physical properties and evolutionary processes of galaxies at z~1. It includes the following deep, wide-field imaging data se…
An XMM-Newton survey of broad iron lines in Seyfert galaxies
Nandra, K.; Reeves, J. N.; George, I. M. +1 more
We present an analysis of the X-ray spectra of a sample of 37 observations of 26 Seyfert galaxies observed by XMM-Newton in order to characterize their iron Kα emission. All objects show evidence for iron line emission in the 6-7 keV band. A narrow `core' at 6.4 keV is seen almost universally in the spectra, and we model this using a neutral Compt…