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Source location of chorus emissions observed by Cluster
Maksimovic, M.; Parrot, M.; Cornilleau-Wehrlin, N. +2 more
One of the objectives of the Cluster mission is to study sources of various electromagnetic waves using the four satellites. This paper describes the methods we have applied to data recorded from the STAFF spectrum analyser. This instrument provides the cross spectral matrix of three magnetic and two electric field components. This spectral matrix…
Complex optical-X-ray correlations in the narrow-line Seyfert 1 galaxy NGC 4051
Netzer, H.; Uttley, P.; Shemmer, O. +1 more
This paper presents the results of a dense and intensive X-ray and optical monitoring of the narrow-line Seyfert 1 galaxy NGC 4051 carried out in 2000. Results of the optical analysis are consistent with previous measurements. The amplitude of optical emission-line variability is a factor of 2 larger than that of the underlying optical continuum, …
Discovery of a helium-core white dwarf progenitor
Heber, U.; Napiwotzki, R.; Lisker, T. +1 more
We discovered that HD 188112, a bright (V = \magpt{10}{2}), nearby (80 pc) B-type star, is a unique subluminous B (sdB) star. SdB stars are usually identified with models of core helium burning Extreme Horizontal-Branch (EHB) stars of half a solar mass. A spectral analysis of the hydrogen and helium lines resulted in T_eff = 21 500 +/- 500 K, log …
Chromospheric Evaporation and Warm Rain during a Solar Flare Observed in High Time Resolution with the Coronal Diagnostic Spectrometer aboard the Solar and Heliospheric Observatory
Brosius, Jeffrey W.
We present EUV light curves, Doppler shifts, and line-broadening measurements for a flaring solar active region obtained with the Coronal Diagnostic Spectrometer (CDS) aboard the NASA ESA Solar and Heliospheric Observatory (SOHO) under conditions of (1) comprehensive temporal coverage (including the quiescent preflare, impulsive, and gradual decli…
Near-IR echelle spectroscopy of Class I protostars: Mapping Forbidden Emission-Line (FEL) regions in [FeII]
Ray, T. P.; Chrysostomou, A.; Davis, C. J. +1 more
Near-IR echelle spectra in [FeII] 1.644 mu m emission trace Forbidden Emission Line (FEL) regions towards seven Class I HH energy sources (SVS 13, B5-IRS1, IRAS 04239+2436, L1551-IRS5, HH 34-IRS, HH 72-IRS and HH 379-IRS) and three classical T Tauri stars (AS 353A, DG Tau and RW Aur). The parameters of these FEL regions are compared to the charact…
A Chandra Study of the Complex Structure in the Core of 2A 0335+096
Mazzotta, P.; Markevitch, M.; Edge, A. C.
We present a Chandra observation of the central (r<200 kpc) region of the cluster of galaxies 2A 0335+096, rich in interesting phenomena. On large scales (r>40 kpc), the X-ray surface brightness is symmetric and slightly elliptical. The cluster has a cool, dense core; the radial temperature gradient varies with position angle. The radial met…
High-Resolution Observations of Interstellar Ca I Absorption-Implications for Depletions and Electron Densities in Diffuse Clouds
Welty, Daniel E.; Hobbs, L. M.; Morton, Donald C.
We present high-resolution (FWHM~0.3-1.5 km s-1) spectra, obtained with the AAT UHRF, the McDonald Observatory 2.7 m coudé spectrograph, and/or the KPNO coudé feed, of interstellar Ca I absorption toward 30 Galactic stars. Comparisons of the column densities of Ca I, Ca II, K I, and other species-for individual components identified in …
Gamma-Ray Lines from Asymmetric Supernovae
Fryer, Chris L.; Hungerford, Aimee L.; Warren, Michael S.
We present three-dimensional smoothed particle hydrodynamics simulations of supernova explosions from 100 s to 1 yr after core bounce. By extending our modeling efforts to a three-dimensional hydrodynamics treatment, we are able to investigate the effects of explosion asymmetries on mixing and γ-ray line emergence in supernovae. A series of initia…
Fine-Scale Temperature Fluctuations in the Orion Nebula and the t2 Problem
O'Dell, C. R.; Peimbert, Antonio; Peimbert, Manuel
We present a high spatial resolution map of the columnar electron temperature (Tc) of a region to the southwest of the Trapezium in the Orion Nebula. This map was derived from Hubble Space Telescope images that isolated the primary lines of H I for determination of the local extinction and of the [O III] lines for determination of T
ISOGAL: A deep survey of the obscured inner Milky Way with ISO at 7 mu m and 15 mu m and with DENIS in the near-infrared
Genzel, R.; Price, S. D.; Alard, C. +51 more
The ISOGAL project is an infrared survey of specific regions sampling the Galactic Plane selected to provide information on Galactic structure, stellar populations, stellar mass-loss and the recent star formation history of the inner disk and Bulge of the Galaxy. ISOGAL combines 7 and 15 µm ISOCAM observations -- with a resolution of 6 arcse…