Search Publications
Missions
Journals
Publication Years
Observation of GRB 030131 with the INTEGRAL satellite
Pian, E.; Frontera, F.; Hurley, K. +13 more
A long Gamma-Ray Burst (GRB) was detected with the instruments on board the INTEGRAL satellite on January 31 2003. Although most of the GRB, which lasted ~ 150 s, occurred during a satellite slew, the automatic software of the INTEGRAL Burst Alert System was able to detect it in near-real time. Here we report the results obtained with the IBIS ins…
Hyades dynamics from N-body simulations: Accuracy of astrometric radial velocities from Hipparcos
Madsen, Søren
The internal velocity structure in the Hyades cluster as seen by Hipparcos is compared with realistic N-body simulations using the NBODY6 code, which includes binary interaction, stellar evolution and the Galactic tidal field. The model allows to estimate reliably the accuracy of astrometric radial velocities in the Hyades as derived by Lindegren …
New Identifications of Mn VI and Fe VII Vacuum Ultraviolet Lines
Feldman, U.; Ekberg, J. O.
The Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer aboard the Solar and Heliospheric Observatory (SOHO) recorded a large number of spectra in the 500-1600 Å region. Although many of the detected lines have already been identified, the origins of a substantial fraction of the lines remain unknown. In this paper we report o…
Polar, Cluster and SuperDARN evidence for high-latitude merging during southward IMF: temporal/spatial evolution
Wild, J. A.; Lester, M.; Dunlop, M. +5 more
Magnetic merging on the dayside magnetopause often occurs at high latitudes. Polar measured fluxes of accelerated ions and wave Poynting vectors while skimming the subsolar magnetopause. The measurements indicate that their source was located to the north of the spacecraft, well removed from expected component merging sites. This represents the fi…
Emission-Line Galaxies in the Space Telescope Imaging Spectrograph Parallel Survey. I. Observations and Data Analysis
Gardner, Jonathan P.; Teplitz, Harry I.; Rhodes, Jason +5 more
In the first 3 years of operation the Space Telescope Imaging Spectrograph (STIS) obtained slitless spectra of ~2500 fields in parallel to prime Hubble Space Telescope (HST) observations as part of the STIS parallel survey (SPS). The archive contains ~300 fields at high Galactic latitude (b>30deg) with spectroscopic exposure times gr…
Propagation velocities of gas rings in collisional ring galaxies
Bizyaev, D.; Vorobyov, E. I.
The propagation velocity of the first gas ring in collisional ring galaxies, i.e. the velocity at which the maximum in the radial gas density profile propagates radially in the galactic disk, is usually inferred from the radial expansion velocity of gas in the first ring. Our numerical hydrodynamics modeling of ring galaxy formation however shows …
pnCCDs on XMM-Newton—42 months in orbit
Haberl, Frank; Freyberg, Michael; Dennerl, Konrad +11 more
XMM-Newton—a cornerstone mission of the European Space Agency's Horizon 2000 programme—was launched on December 10, 1999 into orbit. Since March 2000 more than 2000 scientific observations were made. An example will be shown. The X-ray pnCCD camera on EPIC is operating since then without severe problems. We will report about the system performance…
An analysis of the emission line spectra of AG Pegasi between phases 7.34 and 9.44
Contini, Marcella
The UV and optical spectra from the HST Faint Object Spectrograph and from the Fast Spectrograph for the Tillinghast Telescope (FAST) spectrograph at the Whipple Observatory reported by Kenyon, Proga & Keyes at different phases are analysed, leading to new results about the configuration of AG Pegasi. The FAST spectra contain both Hα and Hβ li…
870 Micron Observations of Nearby 3CRR Radio Galaxies
Quillen, A. C.; Yukita, Mihoko; Almog, Jessica
We present submillimeter continuum observations at 870 µm of the cores of low-redshift 3CRR radio galaxies, observed at the Heinrich Hertz Submillimeter Telescope. The cores are nearly flat-spectrum between the radio and submillimeter, which implies that the submillimeter continuum is likely to be synchrotron emission and not thermal emissio…
Improved Hipparcos Parallaxes of Coma Berenices and NGC 6231
Makarov, Valeri V.
A method to reprocess the Hipparcos Intermediate Astrometry Data that reduces the propagation of the along-scan spacecraft attitude errors was developed and successfully used to obtain a more consistent parallax of the Pleiades (Makarov, published in 2002). The same technique is used now to correct the Hipparcos parallaxes of the Coma Berenices an…