Search Publications
Properties and Origin of the High-Velocity Gas Toward the Large Magellanic Cloud
Lehner, N.; Staveley-Smith, L.; Howk, J. C.
In the spectra of 139 early-type Large Magellanic Cloud (LMC) stars observed with Far Ultraviolet Spectroscopic Explorer and with deep radio Parkes H I 21 cm observations along with those stars, we search for and analyze the absorption and emission from high-velocity gas at +90 <= v LSR <= +175 km s-1. The H I column de…
Chianti—An Atomic Database for Emission Lines. XI. Extreme-Ultraviolet Emission Lines of Fe VII, Fe VIII, and Fe IX Observed by Hinode/EIS
Young, P. R.; Landi, E.
A detailed study of emission lines from Fe VII, Fe VIII, and Fe IX observed by the EUV Imaging Spectrometer on board the Hinode satellite is presented. Spectra in the ranges 170-212 Å and 246-292 Å show strongly enhanced lines from the upper solar transition region (temperatures 5.4 <= log T <= 5.9) allowing a number of new line identificati…
Exploring the formation of spheroidal galaxies out to z ~ 1.5 in GOODS
Lisker, Thorsten; Kaviraj, Sugata; Pasquali, Anna +1 more
The formation of massive spheroidal galaxies is studied on a visually classified sample extracted from the Advanced Camera for Surveys/Hubble Space Telescope (ACS/HST) images of the Great Observatories Origins Deep Survey north and south fields, covering a total area of 360 arcmin2. The sample size (910 galaxies brighter than iF775…
Hubble Space Telescope/Advanced Camera for Surveys Morphology of Lyα Emitters at Redshift 5.7 in the COSMOS Field
Aussel, H.; Cimatti, A.; Sanders, D. B. +28 more
We present detailed morphological properties of Lyα emitters (LAEs) at z ≈ 5.7 in the COSMOS field based on Hubble Space Telescope Advanced Camera for Surveys (ACS) data. The ACS imaging in the F814W filter covered 85 LAEs of the 119 LAEs identified in the full two square degree field, and 47 LAEs of them are detected in the ACS images. Nearly hal…
Measurement of the Dark Matter Velocity Anisotropy in Galaxy Clusters
Host, Ole; Kay, Scott T.; Ettori, Stefano +4 more
The internal dynamics of a dark matter structure may have the remarkable property that the local temperature in the structure depends on direction. This is parameterized by the velocity anisotropy β which must be zero for relaxed collisional structures, but has been shown to be nonzero in numerical simulations of dark matter structures. Here, we p…
Dynamics and waves near multiple magnetic null points in reconnection diffusion region
Pickett, J. S.; Lucek, E.; Fazakerley, A. N. +24 more
Identifying the magnetic structure in the region where the magnetic field lines break and how reconnection happens is crucial to improving our understanding of three-dimensional reconnection. Here we show the in situ observation of magnetic null structures in the diffusion region, the dynamics, and the associated waves. Possible spiral null pair h…
The Enrichment of the Intracluster Medium
Zabludoff, Ann I.; Gonzalez, Anthony H.; Zaritsky, Dennis +2 more
To determine the relative contributions of galactic and intracluster stars to the enrichment of the intracluster medium (ICM), we present X-ray surface brightness, temperature, and Fe abundance profiles for a set of 12 galaxy clusters4Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributio…
Constraining the energy budget of GRB080721
Howarth, I. D.; Rol, E.; Fynbo, J. P. U. +17 more
We follow the bright, highly energetic afterglow of Swift-discovered GRB080721 at z = 2.591 out to 36 d or 3 × 106s since the trigger in the optical and X-ray bands. We do not detect a break in the late-time light curve inferring a limit on the opening angle of and setting tight constraints on the total energy budget of the burst of E
The Dark Spot in the atmosphere of Uranus in 2006: Discovery, description, and dynamical simulations
Sromovsky, L. A.; Fry, P. M.; Hammel, H. B. +6 more
We report the first definitive detection of a discrete dark atmospheric feature on Uranus in 2006 using visible and near-infrared images from the Hubble Space Telescope and the Keck II 10-m telescope. Like Neptune's Great Dark Spots, this Uranus Dark Spot had bright companion features that exhibited considerable variability in brightness and locat…
The 2008 August 1 Eclipse Solar-Minimum Corona Unraveled
Rušin, V.; Druckmüller, M.; Aniol, P. +3 more
We discuss the results stemming from observations of the white-light and [Fe XIV] emission corona during the total eclipse of the Sun of 2008 August 1, in Mongolia (Altaj region) and in Russia (Akademgorodok, Novosibirsk, Siberia). Corresponding to the current extreme solar minimum, the white-light corona, visible up to 20 solar radii, was of a tr…