Search Publications
The Dependence of Star Formation Activity on Stellar Mass Surface Density and Sersic Index in zCOSMOS Galaxies at 0.5 < z < 0.9 Compared with SDSS Galaxies at 0.04 < z < 0.08
Kneib, J. -P.; Maccagni, D.; Cimatti, A. +56 more
In order to try to understand the internal evolution of galaxies and relate this to the global evolution of the galaxy population, we present a comparative study of the dependence of star formation rates on the average surface mass densities (Σ M ) of galaxies at 0.5 < z < 0.9 and 0.04 < z < 0.08, using the zCOSMOS and Sloan…
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…
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…
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…
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…
Solar Magnetic Helicity Injected into the Heliosphere: Magnitude, Balance, and Periodicities Over Solar Cycle 23
Georgoulis, M. K.; Pevtsov, A. A.; Rust, D. M. +2 more
Relying purely on solar photospheric magnetic field measurements that cover most of solar cycle 23 (1996-2005), we calculate the total relative magnetic helicity injected into the solar atmosphere, and eventually shed into the heliosphere, over the latest cycle. Large active regions dominate the helicity injection process with ~5.7 × 1045
Characterization of Clouds in Titan's Tropical Atmosphere
Sotin, Christophe; Le Mouélic, Stéphane; Rodriguez, Sebastien +7 more
Images of Titan's clouds, possible over the past 10 years, indicate primarily discrete convective methane clouds near the south and north poles and an immense stratiform cloud, likely composed of ethane, around the north pole. Here we present spectral images from Cassini's Visual Mapping Infrared Spectrometer that reveal the increasing presence of…
Evolution of Optical Penumbral and Shear Flows Associated with the X3.4 Flare of 2006 December 13
Wang, Haimin; Chen, P. F.; Abramenko, Valentyna +1 more
The rapid and irreversible decay of penumbrae related to X-class flares has been found in a number of studies. Since the optical penumbral flows are closely associated with the morphology of sunspot penumbra, we use state-of-the-art Hinode data to track penumbral flows in flaring active regions as well as shear flows close to the flaring neutral l…