Search Publications
UV-dropout Galaxies in the Goods-South Field from WFC3 Early Release Science Observations
Holtzman, J. A.; O'Connell, R. W.; Walker, A. R. +22 more
We combine new high sensitivity ultraviolet (UV) imaging from the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) with existing deep HST/Advanced Camera for Surveys optical images from the Great Observatories Origins Deep Survey (GOODS) program to identify UV-dropouts, which are Lyman break galaxy (LBG) candidates at z ~= 1-3. These…
The Buildup of the Hubble Sequence in the Cosmos Field
Kneib, J. -P.; Aussel, H.; Le Floc'h, E. +27 more
We use ~8600 COSMOS galaxies at mass scales >5 × 1010 M sun to study how the morphological mix of massive ellipticals, bulge-dominated disks, intermediate-bulge disks, disk-dominated galaxies, and irregular systems evolves from z = 0.2 to z = 1. The morphological evolution depends strongly on mass. At M > 3 × 1011<…
A Kinetic Alfvén Wave Cascade Subject to Collisionless Damping Cannot Reach Electron Scales in the Solar Wind at 1 AU
Borovsky, J. E.; Podesta, J. J.; Gary, S. P.
Turbulence in the solar wind is believed to generate an energy cascade that is supported primarily by Alfvén waves or Alfvénic fluctuations at MHD scales and by kinetic Alfvén waves (KAWs) at kinetic scales k bottomρ i >~ 1. Linear Landau damping of KAWs increases with increasing wavenumber and at some point the damping b…
Is the Polar Region Different from the Quiet Region of the Sun?
Tsuneta, Saku; Tokumaru, Munetoshi; Fujiki, Ken'ichi +2 more
Observations of the polar region of the Sun are critically important for understanding the solar dynamo and the acceleration of solar wind. We carried out precise magnetic observations on both the north polar region and the quiet Sun at the east limb with the spectropolarimeter of the Solar Optical Telescope aboard Hinode to characterize the polar…
X-ray variation statistics and wind clumping in Vela X-1
Klochkov, D.; Wilms, J.; Pottschmidt, K. +8 more
We investigate the structure of the wind in the neutron star X-ray binary system Vela X-1 by analyzing its flaring behavior. Vela X-1 shows constant flaring, with some flares reaching fluxes of more than 3.0 Crab between 20-60 keV for several 100 s, while the average flux is around 250 mCrab. We analyzed all archival INTEGRAL data, calculating the…
TANGO I: Interstellar medium in nearby radio galaxies. Molecular gas
Lim, J.; Combes, F.; Leon, S. +1 more
Context. Powerful radio-AGN are hosted by massive elliptical galaxies that are usually very poor in molecular gas. Nevertheless, gas is needed at their very center to feed the nuclear activity.
Aims: We study the molecular gas properties (i.e., mass, kinematics, distribution, origin) of these objects, and compare them with results for other k…
First CoRoT light curves of RR Lyrae stars. Complex multiplet structure and non-radial pulsation detections in V1127 Aquilae
Auvergne, M.; Poretti, E.; Baglin, A. +14 more
Context. The CoRoT - Convection Rotation and planetary Transits - space mission is a great opportunity for monitoring stars with excellent time-sampling and unprecedented photometric precision for up to 150 days. As an important benefit, high-quality RR Lyrae light curves are obtained with a quasi-uninterrupted coverage over several pulsation and …
Fermi Large Area Telescope Observation of a Gamma-ray Source at the Position of Eta Carinae
Ozaki, M.; Caraveo, P. A.; Frailis, M. +165 more
The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope detected a γ-ray source that is spatially consistent with the location of Eta Carinae. This source has been persistently bright since the beginning of the LAT survey observations (from 2008 August to 2009 July, the time interval considered here). The γ-ray signal is detect…
PACS and SPIRE photometer maps of M 33: First results of the HERschel M 33 Extended Survey (HERM33ES)
Boquien, M.; Braine, J.; Beck, R. +37 more
Context. Within the framework of the HERM33ES key program, we are studying the star forming interstellar medium in the nearby, metal-poor spiral galaxy M 33, exploiting the high resolution and sensitivity of Herschel.
Aims: We use PACS and SPIRE maps at 100, 160, 250, 350, and 500 µm wavelength, to study the variation of the spectral en…
Large-scale waves in the solar corona: The continuing debate
Warmuth, Alexander
Ten years after the first observation of large-scale wave-like coronal disturbances with the EIT instrument aboard SOHO, the most crucial questions concerning these “EIT waves” are still being debated controversially - what is their actual physical nature, and how are they launched? Possible explanations include MHD waves or shocks, launched by fl…