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The Hubble Higher z Supernova Search: Supernovae to z ~ 1.6 and Constraints on Type Ia Progenitor Models
Dickinson, Mark; Giavalisco, Mauro; Ravindranath, Swara +33 more
We present results from the Hubble Higher z Supernova Search, the first space-based open field survey for supernovae (SNe). In cooperation with the Great Observatories Origins Deep Survey, we have used the Hubble Space Telescope with the Advanced Camera for Surveys to cover ~300 arcmin2 in the area of the Chandra Deep Field South and th…
The star formation rate of the Universe at z~ 6 from the Hubble Ultra-Deep Field
Bunker, Andrew J.; McMahon, Richard G.; Ellis, Richard S. +1 more
We determine the abundance of i'-band dropouts in the recently released HST/ACS Hubble Ultra-Deep Field (UDF). Because the majority of these sources are likely to be z~ 6 galaxies whose flux decrement between the F775W i'-band and F850LP z'-band arises from Lyman-α absorption, the number of detected candidates provides a valuable upper limit to th…
The ACS Virgo Cluster Survey. I. Introduction to the Survey
Jordán, Andrés; Tonry, John L.; Côté, Patrick +7 more
The Virgo Cluster is the dominant mass concentration in the Local Supercluster and the largest collection of elliptical and lenticular galaxies in the nearby universe. In this paper, we present an introduction to the ACS Virgo Cluster Survey: a program to image, in the F475W and F850LP bandpasses (~Sloan g and z), 100 early-type galaxies in the Vi…
Nearby stars of the Galactic disk and halo. III.
Fuhrmann, K.
High-resolution spectroscopic observations of about 150 nearby stars or star systems are presented and discussed. The study of these and another 100 objects of the previous papers of this series implies that the Galaxy became reality 13 or 14 Gyr ago with the implementation of a massive, rotationally-supported population of thick-disk stars. The v…
Kinetic parameters of interstellar neutral helium. Review of results obtained during one solar cycle with the Ulysses/GAS-instrument
Witte, M.
The GAS-instrument onboard the space probe Ulysses is designed to measure the local angular distribution of the flow of interstellar neutral He-atoms within ≈3 AU distance from the sun. It allows to infer the kinetic parameters (velocity vector, temperature and density) of these particles outside the heliosphere (``at infinity''). During three obs…
Cosmic Variance in the Great Observatories Origins Deep Survey
Ferguson, Henry C.; Giavalisco, Mauro; Somerville, Rachel S. +3 more
Cosmic variance is the uncertainty in observational estimates of the volume density of extragalactic objects such as galaxies or quasars arising from the underlying large-scale density fluctuations. This is often a significant source of uncertainty, especially in deep galaxy surveys, which tend to cover relatively small areas. We present estimates…
The Team Keck Treasury Redshift Survey of the GOODS-North Field
Davis, Marc; Capak, Peter; Faber, S. M. +19 more
We report the results of an extensive imaging and spectroscopic survey in the Great Observatories Origins Deep Survey (GOODS)-North field completed using DEIMOS on the Keck II telescope. Observations of 2018 targets in a magnitude-limited sample of 2911 objects to RAB=24.4 yield secure redshifts for a sample of 1440 galaxies and active …
Coronal Magnetic Field Measurements
Lin, H.; Kuhn, J. R.; Coulter, R.
A long-standing solar problem has been to measure the coronal magnetic field. We believe it determines the coronal structure and dynamics from the upper chromosphere out into the heliospheric environment. It is only recently that Zeeman splitting observations of infrared coronal emission lines have been successfully used to deduce the coronal magn…
The Dark Matter Distribution in the Central Regions of Galaxy Clusters: Implications for Cold Dark Matter
Smith, Graham P.; Treu, Tommaso; Ellis, Richard S. +1 more
We have undertaken a spectroscopic survey of gravitational arcs in a carefully chosen sample of six clusters, each containing a dominant brightest cluster galaxy. We use these systems to study the relative distributions of dark and baryonic material in the central regions. Three clusters present both radial and tangential arcs and provide particul…
Spatial scale of high-speed flows in the plasma sheet observed by Cluster
Balogh, A.; Zhang, T. L.; Klecker, B. +9 more
Spatial gradients of high-speed flows in the midtail plasma sheet are determined using multipoint observations from the Cluster spacecraft along the ``dawn-dusk'' direction (perpendicular to the main flow and in the plane of the tail current sheet) and along the north-south direction. If we take the average or median of the spatial gradients and a…