Search Publications
Stellar population and dust extinction in an ultraluminous infrared galaxy at z = 1.135
Kawara, K.; Oyabu, S.; Yoshii, Y. +6 more
We present the detailed optical to far-infrared (far-IR) observations of SST J1604+4304, an ultraluminous IR galaxy at z = 1.135. Analysing the stellar absorption lines, namely, the CaII H & K and Balmer H lines in the optical spectrum, we derive the upper limits of an age for the stellar population. Given this constraint, the minimum χ2<…
INTEGRAL Observations of OAO 1657-415: Gamma-Ray Tomography of a B Super Giant
Bulik, T.; Denis, M.; Marcinkowski, R.
OAO 1657-415 is an accreting pulsar in an eclipsing binary system. We analyzed the INTEGRAL core program observations of this object and obtained the eclipse light curve in the soft gamma-ray band between 15 keV and 40 keV. We note that the gamma rays from the pulsar allow to probe the density profile of the outer layers of the B super giant compa…
Possible wave modes of wideband nonthermal continuum radiation in its source region
Santolík, O.; Grimald, S.
Nonthermal continuum (NTC) electromagnetic radiation is generated within the Earth's magnetosphere and radiated to the outer space. We present cases of a specific type of NTC, which appears as multiple wide bands on the spectrograms recorded by the Cluster spacecraft just outside the plasmapause. This NTC comes from several sources located in the …
Spectropolarimetric analysis of 3D MHD sunspot simulations
Solanki, S. K.; Borrero, J. M.; Rempel, M.
We have employed 3D non-grey MHD simulations of sunspots to compute theoretical Stokes profiles and compare the levels of circular and linear polarization in the simulations with those observed in a real sunspot. We find that the spatial distribution and average values of these quantities agree very well with the observations, although the polariz…
Kelvin-Helmholtz Multi-Spacecraft Studies at the Earth's Magnetopause Boundaries
Farrugia, C. J.; Fazakerley, A. N.; Owen, C. J. +2 more
The Kelvin-Helmholtz (KH) instability can operate in various situations in the solar wind, but at the boundaries of planetary obstacles, for example the Earth's magnetopause, it is most amenable to investigation. Reliable estimates of wave characteristics are essential for comparison with theoretical and numerical models and for understanding the …
Spatial distribution of metal emissions in supernova remnant 3C 397 viewed with Chandra and XMM
Chen, Yang; Jiang, Bing
We present X-ray equivalent width imaging of 3C 397 for Mg Heα, Si Heα, S Heα, and Fe Kα complex lines with Chandra and XMM-Newton observations. The images revealed that the heavier the element is, the smaller the extent of the element distribution is. The Mg emission is evidently enhanced in the southeastern blow-out region, well along the radio …
Pre-flyby estimates of the precision of the mass determination of asteroid (21) Lutetia from Rosetta radio tracking
Pätzold, M.; Bird, M. K.; Asmar, S. W. +5 more
The Rosetta spacecraft will fly by its second target asteroid (21) Lutetia on 10 July 2010. Simulations based on the currently known size of Lutetia and assumptions on the bulk density show that tracking of two radio-carrier frequencies at X-band (8.4 GHz) and S-band (2.3 GHz) during the flyby will determine the mass at less than 1% accuracy. Deri…
Analysis of two sections of Shalbatana Vallis’ tributary channels
Kereszturi, Akos
Six tributaries of Shalbatana outflow channel were analyzed based on visible imagery by THEMIS, MOC, HRSC, and HiRISE, as well as on topographic data by MOLA. Two different sections could be identified on the tributaries: the upper and the lower reaches. The upper reaches are shallow, showing U-shaped cross-sectional profiles. Their bottom level i…
Composition of Titan's Surface
Barnes, J. W.; Brown, R. H.; Clark, R. N. +5 more
The Huygens Probe returned the first in situ data on Titan's surface composition in January 2005. Although Huygens landed on a dry plain, the Gas Chromatograph Mass Spectrometer (GCMS) showed evidence of methane moisture in the near subsurface suggesting methane precipitation at some time in the past. Heavier organic molecules were not found to be…
Dissipation of buoyancy waves and turbulence in the atmosphere of venus
Izakov, M. N.
The turbulent energy dissipation rate and the coefficients of turbulent diffusion and viscosity caused by breaking buoyancy waves (BWs) have been calculated. From the comparison of these values with other data, the contribution of BWs to the generation of turbulence has been determined. The comparison confirms the validity of the turbulence charac…