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Plasma diagnostics of active-region evolution and implications for coronal heating
Mathioudakis, M.; Bloomfield, D. S.; Keenan, F. P. +2 more
A detailed study is presented of the decaying solar-active region NOAA 10103 observed with the Coronal Diagnostic Spectrometer (CDS), the Michelson Doppler Imager (MDI) and the Extreme-ultraviolet Imaging Telescope (EIT) onboard the Solar and Heliospheric Observatory (SOHO). Electron-density maps formed using SiX (356.03 Å/347.41 Å) show that the …
The Interplanetary Network Supplement to the BATSE Catalogs of Untriggered Cosmic Gamma-Ray Bursts
Frontera, F.; Cline, T.; Hurley, K. +16 more
We present Interplanetary Network (IPN) detection and localization information for 211 gamma-ray bursts (GRBs) observed as untriggered events by the Burst and Transient Source Experiment (BATSE) and published in catalogs by Kommers et al. and Stern et al. IPN confirmations have been obtained by analyzing the data from 11 experiments. For any given…
UV/Optical Nuclear Activity in the gE Galaxy NGC 1399
Crane, Jeffrey D.; O'Connell, Robert W.; Burstein, David +5 more
Using HST STIS, we have detected far-ultraviolet nuclear activity in the giant elliptical galaxy NGC 1399, the central and brightest galaxy in the Fornax I cluster. The source reached a maximum observed far-UV luminosity of ~1.2×1039 ergs s-1 in 1999 January. It was detectable in earlier HST archival images in 1996 (B band) b…
Swift, INTEGRAL, RXTE, and Spitzer Reveal IGR J16283-4838
Gehrels, N.; Rodriguez, J.; Mowlavi, N. +9 more
We present the first combined study of the recently discovered source IGR J16283-4838 with Swift, INTEGRAL, and RXTE. The source, discovered by INTEGRAL on 2005 April 7, shows a highly absorbed [variable NH=(0.4-1.7)×1023 cm-2] and flat (Γ~1) spectrum in the Swift XRT and RXTE PCA data. No optical counterpart is de…
HST and UKIRT imaging observations of z~ 1 6C radio galaxies - II. Galaxy morphologies and the alignment effect
Röttgering, H. J. A.; Inskip, K. J.; Best, P. N. +1 more
Powerful radio galaxies often display enhanced optical/ultraviolet emission regions, elongated and aligned with the radio jet axis. The aim of this series of papers is to investigate separately the effects of radio power and redshift on the alignment effect, together with other radio galaxy properties. In this second paper, we present a deeper ana…
Mid-IR spectro-imaging observations with the ISOCAM CVF: Final reduction and archive
Blommaert, J. A. D. L.; Boulanger, F.; Abergel, A. +6 more
Mid-IR (5-17~µm) Spectro-Imaging observations towards several hundred sky positions were obtained with the Infrared Space Observatory Camera (ISOCAM), and a Circular Variable Filter (CVF) that provided spectral resolution R = λ/Δ λ ~ 45 over a 3' × 3' field (for 6, and 12´´ pixels, proportionally smaller for the observations carried with the…
Solar hydrogen-Lyman continuum observations with SOHO/SUMER
Vial, J. -C.; Parenti, S.; Lemaire, P.
In this work we analyze the emission of the H Lyman continuum (HI LyC) in the Quiet Sun (QS) and a solar prominence, in order to derive information on the temperature of the emitting plasma. We used the spectral atlas obtained with SOHO/SUMER detector A in 1999 (Parenti et al. 2005, A&A, 443, 679). The high spectral resolution of this instrume…
Cluster and Double Star observations of dipolarization
Balogh, A.; Zhang, T. L.; Dandouras, I. +15 more
We studied two types of dipolarization events with different IMF conditions when Cluster and Double Star (TC-1) were located in the same local time sector: 7 August 2004, 18:00-24:00 UT, during a disturbed southward/northward IMF interval, and 14 August 2004, 21:00-24:00 UT, when the IMF was stably northward. Cluster observed dipolarization as wel…
A Study of the Near-Ultraviolet Spectrum of Vega
Hubeny, Ivan; Allende Prieto, Carlos; García López, Ramón J. +1 more
UV, optical, and near-IR spectra of Vega have been combined to test our understanding of stellar atmospheric opacities and to examine the possibility of constraining chemical abundances from low-resolution UV fluxes. We have carried out a detailed analysis assuming local thermodynamic equilibrium (LTE) to identify the most important contributors t…
Faint Blue Objects in the Hubble Deep Field-South Revealed: White Dwarfs, Subdwarfs, and Quasars
Winget, D. E.; Kilic, Mukremin; von Hippel, Ted +1 more
We explore the nature of the faint blue objects in the Hubble Deep Field-South. We have derived proper motions for the point sources in the Hubble Deep Field-South using a 3 yr baseline. Combining our proper-motion measurements with spectral energy distribution fitting enabled us to identify four quasars and 42 stars, including three white dwarf c…