Search Publications
Venus Express—Science observations experience at Venus
Koschny, D.; Witasse, O.; Svedhem, H. +3 more
The Venus Express mission is the European Space Agency's (ESA) first spacecraft at Venus. It was launched in November 2005 by a Soyuz-Fregat launcher and arrived at Venus in April 2006. The mission covers a broad range of scientific goals including physics, chemistry, dynamics and structure of the atmosphere as well as atmospheric interaction with…
Dynamics of Faint Clusters of Galaxies
Erkurt, A.; Tektunali, H. G.; Hudaverdi, M. +1 more
Recent studies with high-resolution cameras have extensively showed that clusters of galaxies are not as relaxed as we assumed. With its advent technology XMM-Newton allows us to obtain the temperature and metal abundance map in detail. In this study, we present our results related to six (A194, A1056, A1674, A1882, A2634, A2638) nearby (z < 0.…
Forecasting maximum solar flare magnitudes from photospheric magnetograms
Sakurai, T.; Yamamoto, Tetsuya T.
The purpose of this paper is to forecast the maximum solar flare magnitude in an active region and its uncertainty from photospheric magnetic field data. We analyzed 21 flare samples covering X-ray flare magnitudes from A5.0 to X17.0. Photospheric magnetic parameters are obtained from vector and line of sight magnetograms observed with the Solar F…
Erratum: "Abell 851 and the Role of Starbursts in Cluster Galaxy Evolution" (2009, ApJ, 693, 152)
Smail, Ian; Fritz, Jacopo; Dressler, Alan +5 more
AKARI—Infrared Satellite Mission—Present Status and Early Results
Onaka, Takashi
AKARI, formerly known as ASTRO-F, is a satellite mission dedicated to infrared astronomy for the first time in Japan. It has a 685-mm aperture telescope with two focal-plane instruments cooled by liquid helium (LHe) and mechanical coolers on board for observations in the 2–180 µm infrared spectral range. AKARI was launched on 2006 February 2…
The Unusual Spectral Energy Distribution of LBQS 0102-2713
Boller, Th.; Heftrich, T.; Linguri, K. +1 more
We have studied the spectral energy distribution of the quasar LBQS 0102-2713. The available multiwavelength data in the observers frame are one optical spectrum between 3200 and 7400 Å, seven Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) spectra between 1700 and 2300 Å, one GALEX NUV flux density and a KS magnitude obtai…
The true Blazhko behaviour of DM Cyg
Hurta, Zs.
We present preliminary results of our work on DM Cyg, an RRab star with steadily increasing pulsation period. The Blazhko modulation of the light curve of DM Cyg has not been undoubtedly confirmed yet. A reanalysis of the original data (Sódor & Jurcsik 2005) could not confirm the 26 d periodicity found by Lysova & Firmanyuk (1980) in the t…
On the possibility of ion-acoustic instability in Titan's ionosphere
Shukla, P. K.; Rosenberg, M.
Heavy negatively charged ions have recently been detected at relatively high altitudes in the ionosphere of Titan, and it has been suggested that perhaps they are supported by electric fields. In this short communication, we discuss the possibility of ion-acoustic instability in this environment.
The influence of the stray-light component in determining coronal temperature structures
Zhang, Mei; Hao, Juan
We use a few solar partial eclipse observations made by XRT/Hinode to estimate the influence of stray-light component in determining coronal temperature structures. Our analysis shows that the stray light will largely affect the estimation of coronal temperature and change the estimated temperature structure in one coronal hole region. The stray l…
Ultraviolet Spectrum Variability of BP Tau
Ismayilov, N. Z.; Alimardanova, F. N.; Baheddinova, G. R.
Results of the ultraviolet IUE archive spectrum of classic T Tauri type star BP Tau had been presented. Spectroscopic parameters of mainly strong emission lines were measured. On the more full massive of measurements of the emission doublet MgII λ2800 Å variability of the intensity with period P=8.275±0.005 days with high confidence level was obta…