Search Publications
Missions
Journals
Publication Years
An XMM-Newton View of the Soft Gamma Repeater SGR 1806-20: Long-Term Variability in the Pre-Giant Flare Epoch
Tiengo, A.; Götz, D.; Mereghetti, S. +7 more
The low-energy (<10 keV) X-ray emission of the soft gamma repeater SGR 1806-20 has been studied by means of four XMM-Newton observations carried out in the last two years, the latest performed in response to a strong sequence of hard X-ray bursts observed on 2004 October 5. The source was caught in different states of activity; over the 2003-20…
Constraints on z~10 Galaxies from the Deepest Hubble Space Telescope NICMOS Fields
Bouwens, R. J.; Illingworth, G. D.; Thompson, R. I. +1 more
We use all available fields with deep NICMOS imaging to search for J110-dropouts (H160,AB<~28) at z~10. Our primary data set for this search is the two J110+H160 NICMOS fields taken in parallel with the Advanced Camera for Surveys (ACS) Hubble Ultra Deep Field (UDF). The 5 σ limiting magnitudes were ~…
Acceleration and transport of heavy ions at coronal mass ejection-driven shocks
Li, Gang; Zank, G. P.; Rice, W. K. M.
It is now widely accepted that large solar energetic particle (SEP) events are associated with coronal mass ejection (CME)-driven shocks. Here, particles are often accelerated to approximately MeV energies (and perhaps up to GeV energies) at shock waves driven by CMEs. In this paper, on the basis of our earlier work, we present a detailed model wh…
A Detailed Study of Molecular Clouds toward the TeV Gamma-Ray Supernova Remnant G347.3-0.5
Yamaoka, K.; Fukui, Y.; Onishi, T. +4 more
The supernova remnant G347.3-0.5 (J1713.7-3946) is known as one of the unique SNRs that emit TeV γ-rays, as well as nonthermal X-rays. We present a detailed study of molecular gas toward this SNR obtained with the 4 m millimeter and submillimeter telescope NANTEN at an angular resolution of 2.6 arcmin. This study has revealed that several intensit…
On the Origins of Solar EIT Waves
Thompson, B. J.; Laurenza, M.; Cliver, E. W. +1 more
Approximately half of the large-scale coronal waves identified in images obtained by the Extreme-Ultraviolet Imaging Telescope (EIT) on the Solar and Heliospheric Observatory from 1997 March to 1998 June were associated with small solar flares with soft X-ray intensities below C class. The probability of a given flare of this intensity having an a…
A self-consistent model of plasma and neutrals at Saturn: Neutral cloud morphology
Jurac, S.; Richardson, J. D.
We present a model of the plasma and neutral environment that treats plasma and neutrals self-consistently, using Voyager plasma and ultraviolet H observations and Hubble Space Telescope OH measurements as constraints. The neutral distributions are determined with a Monte Carlo model, and the plasma distributions are determined with a diffusive tr…
Variable morphology of Saturn's southern ultraviolet aurora
Clarke, J. T.; Cowley, S. W. H.; Bunce, E. J. +2 more
The Space Telescope Imaging Spectrograph camera on board Hubble Space Telescope obtained 68 FUV images of Saturn's southern auroral emission between 8 and 30 January 2004, during Cassini's approach to Saturn's magnetosphere. The HST observations took place in four different solar wind regimes with a low-field rarefaction region from 8 to 16 Januar…
Hubble Space Telescope imaging of the progenitor sites of six nearby core-collapse supernovae
Smartt, S. J.; Maund, J. R.
The search for the progenitors of six core-collapse supernovae (CCSNe) in archival Hubble Space Telescope (HST) WFPC2 pre-explosion imaging is presented. These SNe are 1999an, 1999br, 1999ev, 2000ds, 2000ew and 2001B. Post-explosion imaging of the SNe, with the HST ACS/WFC, has been utilized with the technique of differential astrometry to identif…
The Ionized Gas and Nuclear Environment in NGC 3783. V. Variability and Modeling of the Intrinsic Ultraviolet Absorption
Kaiser, Mary Elizabeth; Brandt, W. N.; Kaspi, Shai +13 more
We present results on the location, physical conditions, and geometry of the outflow in the Seyfert 1 galaxy NGC 3783 from a study of the variable intrinsic UV absorption. Based on analysis of 18 observations with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope and six observations with the Far Ultraviolet Spectroscopi…
The Stellar Populations of the M31 Halo Substructure
Lewis, Geraint F.; Ibata, Rodrigo A.; Johnston, Kathryn V. +5 more
We present the first results from our survey of stellar substructure in the outskirts of M31 using the Advanced Camera for Surveys on board the Hubble Space Telescope. We discuss the stellar populations associated with five prominent stellar overdensities discovered during the course of our panoramic ground-based imaging survey with the Isaac Newt…