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The sub-energetic γ-ray burst GRB 031203 as a cosmic analogue to the nearby GRB 980425
Cenko, S. B.; Berger, E.; Frail, D. A. +13 more
Over the six years since the discovery of the γ-ray burst GRB 980425, which was associated with the nearby (distance ~40Mpc) supernova 1998bw, astronomers have debated fiercely the nature of this event. Relative to bursts located at cosmological distance (redshift z ~ 1), GRB 980425 was under-luminous in γ-rays by three orders of magnitude. Radio …
Extremely high speed solar wind: 29-30 October 2003
McComas, D. J.; Steinberg, J. T.; Burlaga, L. F. +5 more
On 29-30 October 2003 the Solar Wind Electron Proton Alpha Monitor (SWEPAM) instrument on the Advanced Composition Explorer (ACE) spacecraft measured solar wind speeds in excess of 1850 km/s, some of the highest speeds ever directly measured in the solar wind. These speeds were observed following two large coronal mass ejection (CME) driven shocks…
The Far-Ultraviolet Spectra of TW Hydrae. II. Models of H2 Fluorescence in a Disk
Herczeg, Gregory J.; Valenti, Jeff A.; Johns-Krull, Christopher M. +2 more
We measure the temperature of warm gas at planet-forming radii in the disk around the classical T Tauri star (CTTS) TW Hya by modeling the H2 fluorescence observed in Hubble Space Telescope Space Telescope Imaging Spectrograph and Far Ultraviolet Spectroscopic Explorer spectra. Strong Lyα emission irradiates a warm disk surface within 2…
Near-Infrared Bright Galaxies at z~=2. Entering the Spheroid Formation Epoch?
Cimatti, A.; Daddi, E.; Tozzi, P. +11 more
Spectroscopic redshifts have been measured for nine K-band luminous galaxies at 1.7<z<2.3, selected with Ks<20 in the K20 survey region of the Great Observatories Origins Deep Survey (GOODS) area. Star formation rates (SFRs) of ~100-500 Msolar yr-1 are derived when dust extinction is taken into account. Th…
An Extended Star Formation History for the Galactic Center from Hubble Space Telescope NICMOS Observations
Rich, R. Michael; Serabyn, Eugene; Figer, Donald F. +2 more
We present Hubble Space Telescope (HST) Near-Infrared Camera and Multiobject Spectrometer (NICMOS) observations as evidence that continuous star formation has created much of the central stellar cusp of the Galaxy. The data are the deepest ever obtained for a Galactic center population, being more than 50% complete for mF205W<19.3, o…
The Cassini Ion and Neutral Mass Spectrometer (INMS) Investigation
Luhmann, J. G.; Ip, W. -H.; McNutt, R. L. +13 more
The Cassini Ion and Neutral Mass Spectrometer (INMS) investigation will determine the mass composition and number densities of neutral species and low-energy ions in key regions of the Saturn system. The primary focus of the INMS investigation is on the composition and structure of Titan’s upper atmosphere and its interaction with Saturn’s magneto…
Evidence for Extended, Obscured Starbursts in Submillimeter Galaxies
Ivison, R. J.; Smail, Ian; Chapman, S. C. +2 more
We compare high-resolution optical and radio imaging of 12 luminous submillimeter galaxies at a median z=2.2+/-0.2 observed with the Hubble Space Telescope (HST) and the MERLIN and Very Large Array (VLA) radio interferometers at comparable spatial resolution, ~0.3" (~2 kpc). The radio emission is used as a tracer of the likely far-IR morphology of…
Spatially resolved X-ray spectroscopy of cooling clusters of galaxies
Böhringer, H.; Kaastra, J. S.; Branduardi-Raymont, G. +7 more
We present spatially resolved X-ray spectra taken with the EPIC cameras of XMM-Newton of a sample of 17 cooling clusters and three non-cooling clusters for comparison. The deprojected spectra are analyzed with a multi-temperature model, independent of any a priori assumptions about the physics behind the cooling and heating mechanisms. All cooling…
The Rest-Frame Optical Properties of SCUBA Galaxies
Ivison, R. J.; Smail, Ian; Blain, A. W. +1 more
We present optical and near-infrared photometry for a sample of 96 dusty, far-infrared-luminous galaxies. We have precise spectroscopic redshifts for all these galaxies, yielding a median redshift of =2.2. The majority, 78, are submillimeter-detected galaxies lying at z=0.2-3.6, while the remaining 18 are optically faint µJy radio galaxies a…
Colors of Active Galactic Nucleus Host Galaxies at 0.5<z<1.1 from the GEMS Survey
Wolf, C.; Barden, M.; Jahnke, K. +13 more
We present the results from a study of the host galaxies of 15 optically selected active galactic nuclei (AGNs) with 0.5<z<1.1 from the Galaxy Evolution from Morphology and SEDs project (GEMS). GEMS is a Hubble Space Telescope imaging survey of a ~28'×28' contiguous field centered on the Chandra Deep Field-South in the …