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…
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…
Broadband Study with Suzaku of the Magnetar Class
Hurley, K.; Rea, N.; Enoto, T. +3 more
Broadband (0.8-70 keV) spectra of the persistent X-ray emission from nine magnetars were obtained with Suzaku, including three objects in apparent outburst. The soft X-ray component was detected from all of them, with a typical blackbody temperature of kT ~ 0.5 keV, while the hard-tail component, dominating above ~10 keV, was detected at ~1 mCrab …
The Massive Progenitor of the Type II-linear Supernova 2009kr
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Foley, Ryan J. +13 more
We present early-time photometric and spectroscopic observations of supernova (SN) 2009kr in NGC 1832. We find that its properties to date support its classification as Type II-linear (SN II-L), a relatively rare subclass of core-collapse supernovae (SNe). We have also identified a candidate for the SN progenitor star through comparison of pre-exp…
A Panoramic View of the Milky Way Analog NGC 891
Rejkuba, M.; Mouhcine, M.; Ibata, R.
Recent panoramic observations of the dominant spiral galaxies of the Local Group have revolutionized our view of how these galaxies assemble their mass. However, it remains completely unclear whether the properties of the outer regions of the Local Group large spirals are typical. Here, we present the first panoramic view of a spiral galaxy beyond…
Isolated Wolf-Rayet Stars and O Supergiants in the Galactic Center Region Identified Via Paschen-α Excess
Morris, M. R.; Wang, Q. D.; Mauerhan, J. C. +4 more
We report the discovery of 19 hot, evolved, massive stars near the Galactic center region (GCR). These objects were selected for spectroscopy owing to their detection as strong sources of Paschen-α (Pα) emission-line excess, following a narrowband imaging survey of the central 0fdg65 × 0fdg25 (l, b) around Sgr A* with the Hubble Space Telescope. D…
The Kinematics of Ionized Gas in Lyman-break Analogs at z ~ 0.2
Law, David R.; Rich, R. Michael; Overzier, Roderik +7 more
We present results for 19 "Lyman-break analogs" observed with Keck/OSIRIS with an adaptive-optics-assisted spatial resolution of less than 200 pc. We detect satellites/companions, diffuse emission, and velocity shear, all with high signal-to-noise ratios. These galaxies present remarkably high velocity dispersion along the line of sight (~70 km s<…