Search Publications

Observation of an Extended Very High Energy Gamma-Ray Emission from MSH 15-52 with CANGAROO-III

Katagiri, H.; Edwards, P. G.; Gunji, S. +46 more

We have observed the supernova remnant MSH 15-52 (G320.4-1.2), which contains the gamma-ray pulsar PSR B1509-58, using the CANGAROO-III imaging atmospheric Cerenkov telescope array from 2006 April to June. We detected gamma rays above 810 GeV at the 7 σ level during a total effective exposure of 48.4 hr. We obtained a differential gamma-ray flux a…

A coordinated campaign of Venus ground-based observations and Venus Express measurements

Lellouch, Emmanuel; Witasse, Olivier

Solar and Heliospheric Observatory/solar Wind Anisotropies Observations of Five Moderately Bright Comets: 1999-2002

Bertaux, J. -L.; Combi, M. R.; Mäkinen, J. T. T. +2 more

Solar Wind Anisotropies (SWAN), the all-sky hydrogen Lyman-alpha camera, on the SOHO spacecraft makes routine all-sky images of the interplanetary neutral hydrogen around the Sun and thus monitors the effect of the variable solar wind on its distribution. SWAN has an ongoing campaign to make special observations of comets, both short- and long-per…

Spectroscopic and photometric observations of the selected Algol-type binaries - II. V2080 Cygni and V2365 Ophiuchi

Frasca, A.; Çakırlı, Ö.; Sipahi, E. +9 more

This paper is the second in the planned series of investigations. We present new radial velocities and photometric observations of V2080 Cyg and V2365 Oph. New UBV photometric data and radial velocities were analysed for the systems' parameters. While V2080 Cyg consists of two nearly equal F-type main-sequence stars, V2365 Oph has two different co…

The iron abundance of the Magellanic Bridge

Dufton, P. L.; Thompson, H. M. A.; Ryans, R. S. I. +1 more

High-resolution Hubble Space Telescope ultraviolet spectra for five B-type stars in the Magellanic Bridge and in the Large (LMC) and Small (SMC) Magellanic Clouds have been analysed to estimate their iron abundances. Those for the Clouds are lower than estimates obtained from late-type stars or the optical lines in B-type stars by approximately 0.…

A Comparison of Feature Classification Methods for Modeling Solar Irradiance Variation

Harvey, K. L.; Pap, J. M.; Jones, H. P. +4 more

Physical understanding of total and spectral solar irradiance variation depends upon establishing a connection between the temporal variability of spatially resolved solar structures and spacecraft observations of irradiance. One difficulty in comparing models derived from different data sets is that the many ways for identifying solar features su…

Physical parameters for Orion KL from modelling its ISO high-resolution far-IR CO line spectrum

White, G. J.; Barlow, M. J.; Cernicharo, J. +5 more

As part of the first high-resolution far-infrared (far-IR) spectral survey of the Orion Kleinmann-Low (KL) region, we observed 20 CO emission lines with J_up = 16 to 39 (upper levels from ~752 to 4294 K above the ground state). Observations were taken using the Long Wavelength Spectrometer on board the Infrared Space Observatory (ISO), i…

A Study of H₂ Emission in Three Bipolar Proto-Planetary Nebulae: IRAS 16594-4656, Hen 3-401, and Rob 22

Smith, Nathan; Hrivnak, Bruce J.; Su, Kate Y. L. +1 more

We have carried out a spatial-kinematic study of three proto-planetary nebulae, IRAS 16594-4656, Hen 3-401, and Rob 22. High-resolution H₂ images were obtained with NICMOS on the Hubble Space Telescope, and high-resolution spectra were obtained with the Phoenix spectrograph on Gemini-South. IRAS 16594-4656 shows a "peanut-shaped" bipola…

Density of discontinuities in the heliosphere

Balogh, A.; ErdőS, G.

The spatial distribution of MHD discontinuities in the solar wind has been studied, based on the long time observations by the magnetometer onboard Ulysses. We emphasize the critical importance of the method whereby events are selected; some previous work is critically reviewed in this respect. Our analysis supports earlier observations that the d…

Synthetic radio maps of CME-driven shocks below 4 solar radii heliocentric distance

Gopalswamy, N.; Schmidt, J. M.

We present 2 1/2 D numerical MagnetoHydroDynamic (MHD) simulations of coronal mass ejections (CMEs) in conjunction with plasma simulations of radio emission from the CME-driven shocks. The CME-driven shock extends to an almost spherical shape during the temporal evolution of the CME. Our plasma simulations can reproduce the dynamic spectra of coro…