Search Publications

“Hook” structure in MARSIS ionogram and its interpretation

Wang, X. -D.; Zou, H.; Wang, J. -S. +1 more

MARSIS/MEX is a low frequency radar used to sound the ionosphere of Mars. In general the echo trace associated with reflections in nadir indicates an ionosphere with a main maximum electron density at typically about 130 km altitude, and a monotonously decreasing density with increasing altitude. Another maximum is sometimes detected at higher alt…

Effects of dust abundance on the far-infrared colours of blue compact dwarf galaxies

Hirashita, Hiroyuki; Ichikawa, Tomohiro T.

We investigate the far-infrared (FIR) properties of a sample of blue compact dwarf galaxies (BCDs) observed by AKARI. By utilizing the data at wavelengths of λ = 65, 90 and 140 µm, we find that the FIR colours of the BCDs are located at the natural high-temperature extension of those of the Milky Way and the Magellanic Clouds. This implies t…

Kinetic models for the exospheres of Jupiter and Saturn

Pierrard, V.

The exospheric theory based on the Kappa velocity distribution function (VDF) is used to model the exosphere of the giant planets Jupiter and Saturn. Such Kappa velocity distribution functions with an enhanced population of suprathermal particles are indeed often observed in space plasmas and in the space environment of the planets. The supratherm…

Simultaneous observations of the plasma density on the same field line by the CPMN ground magnetometers and the Cluster satellites

Ohtani, S.; Kawano, H.; Maeda, N. +6 more

Detection of the Second Eclipsing High-Mass X-Ray Binary in M 33

Williams, Benjamin F.; Haberl, Frank; Mazeh, Tsevi +7 more

Chandra data of the X-ray source [PMH2004] 47 were obtained in the ACIS Survey of M 33 (ChASeM33) in 2006. During one of the observations, the source varied from a high state to a low state and back, in two other observations it varied from a low state to respectively intermediate states. These transitions are interpreted as eclipse ingresses and …

The extended ionized gas around the z = 2.44 radio galaxy MRC 0406-244: the nature of the superbubbles and the optical line brightness asymmetries

Humphrey, A.; Iwamuro, F.; Villar-Martín, M. +2 more

In this Letter, we investigate the nature of the dramatic `superbubble' emission structures associated with the z = 2.44 radio galaxy MRC 0406-244, using rest-frame optical spectroscopy and an archival Hubble Space Telescope (HST) Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) image. Based on the optical line ratios and the HST morpho…

Absolute parameters of young stars - I. U Ophiuci

Demircan, O.; Budding, E.; Inlek, G.

We have carried out an investigation of the early-type multiple star U Oph. We have used new high-resolution spectroscopy with the High Efficiency and Resolution Canterbury University Large Echelle Spectrograph (HERCULES) and 1-m McLellan Telescope of the University of Canterbury at Mt John University Observatory and literature-sourced optical and…

The Frequency of Warm Debris Disks and Transition Disks in a Complete Sample of Intermediate-Mass Glimpse Stars: Placing Constraints on Disk Lifetimes

Kobulnicky, H. A.; Uzpen, B.; Kinemuchi, K.

The incidence of dusty debris disks around low- and intermediate-mass stars has been investigated numerous times in order to understand the early stages of planet formation. Most notably, the Infrared Astronomical Satellite (IRAS) mission observed the entire sky at mid- and far-infrared (IR) wavelengths, identifying the first debris disk systems, …

Unidentified Features in the Ultraviolet Spectrum of X Per

Snow, Theodore P.; Destree, Joshua D.

High-resolution ultraviolet spectra from the Space Telescope Imaging Spectrograph (STIS) were used to search for unidentified interstellar absorption features in the well studied sight line toward X Per (HD 24534). The significance of features detected was determined from Gaussian fits to the data, as well as the features' persistence in multiple …

The data mining: An analysis of 20 eclipsing binary light-curves observed by the INTEGRAL/OMC

Zasche, P.

Twenty eclipsing binaries were selected for an analysis from a huge database of observations made by the INTEGRAL/OMC camera. The photometric data were processed and analyzed, resulting in a first light-curve study of these neglected eclipsing binaries. Most of the selected systems are the detached ones. The system ET Vel was discovered to be an e…