Search Publications

Where is SGR1806-20?

Cline, T.

We have derived a new, precise position for the Soft Gamma Repeater SGR1806-20 by triangulating eight bursts observed by Ulysses, BATSE, and KONUS-WIND. The resulting error box, although within the radio contours of the Galactic supernova remnant G10.0-0.3, is significantly displaced from its core. Although this can be explained by a high velocity…

Study of Early-Type Stars Populations and of Their Origin

Royer, F.

Energy spectra of protons, deuterium, and helium nuclei during quiet solar activity periods in 1996-97

Valtonen, E.; Torsti, J.; Kecskemety, Karoly +4 more

A background reduction method based on pulse-height analysis (see accompanying paper by Valtonen et al.) is applied for the data of the ERNE and EPHIN energetic particle telescopes aboard SOHO. Energy spectra of protons, deuterons, 3He and 4He nuclei have been obtained during very low activity periods in 1996-97 in the energy range of 1.3 to 22 Me…

Disks in the Arp220 nuclei: modeling high resolution line and continuum observations

Genzel, R.; Tacconi, L. J.; Yun, M. S. +4 more

We model molecular and near-infrared emission from the central region of the ultra-luminous infrared galaxy Arp220. We use high angular resolution CO data taken with the Owens Valley millimeter array and NIR images from HST/NICMOS to compare with Monte Carlo line radiative transfer and scattering models. The models suggest that each one of the two…

Probing the Small-Scale Angular Distribution of Gamma-Ray Bursts with Combined Batse/ulysses 4b Locations

Hurley, K.; Kippen, R. M.; Pendleton, G. N.

We investigate the angular distribution of gamma-ray bursts using the largest catalog of well-localized events that is currently available---combined BATSE/Ulysses burst locations. We present the preliminary spatial analysis of 415 BATSE/Ulysses bursts included in the BATSE 4B catalog. We find that the locations are consistent with large- and smal…

Corotating Interaction Regions. Proceedings. ISSI Workshop, Bern (Switzerland), 6 - 13 Jun 1998.

Balogh, A.; Kunow, H.; Gosling, J. T. +2 more

The following topics were dealt with: solar wind corotating interaction regions, stream interfaces, satellite observations, turbulence, energetic particle transport, cosmic rays, CIR solar origin, high-latitude CIRs, outer heliosphere.

Investigation of Asteroids with the Use of Space Vehicles

Shevchenko, V. G.

An overview of the past, present and planned space-based observations of asteroids is given. The main results which have been and will be obtained from the space missions OAO-2, IUE, FIRSSE, IRAS, HIPPARCOS, HST, ISO, MSX, GALILEO, NEAR, DS1, SMART-1, ROSETTA and MUSES-C are presented. The expediency of asteroid investigations with spacecraft is d…

Low Energy ACR Spectra as Observed by the EPAC Investigation Aboard Ulysses

Keppler, E.; Fraenz, M.; Blake, John

The EPAC investigation aboard Ulysses has provided low-background measurements of low-energy ACR ions since launch. In this brief report, we describe a few of these observations and compare them with some observations of other Ulysses investigations.

Secular polar motion - reality or artefact?

Vondrák, Jan

The long-periodic variations of latitude at twelve observatories are used to determine secular and long-periodic polar motion in the interval 1901.0-1991.0. The Hipparcos Catalogue is used as a homogeneous and most accurate realization of International Celestial Reference System (ICRS) in optical wavelength. To derive polar motion components x, y,…

Properties of Emission Line Galaxies at z ≈ 1 to 2

Freudling, Wolfram

A sample of Hα line emitting galaxies at redshifts between 0.7and 1.9 selected from the HST/NICMOS G141 grism parallel survey was recently presented by McCarthy et al. (1999). The galaxies in that sample were identified from quasi-random pointings and therefore should present an unbiased sample of emission line galaxies at that redshift. Spectral …