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Revisiting the Local Kinematics of the Milky Way using the New Hipparcos Data
Zhu, Zi; Yuan, Fang-Ting; Kong, Da-Li
With the new Hipparcos data recently released, we reexamine the kinematics in the solar neighborhood. Two different populations of objects, namely the thin-disk O-B5 stars and the thick-disk K-M giants, are selected for tracing the kinematical parameters of the Galaxy. Using a 3-D kinematical model, the components of the solar motion and the Oort …
Occurrence and source characteristics of the high-latitude components of Jovian broadband kilometric radiation
Morioka, Akira; Tsuchiya, Fuminori; Misawa, Hiroaki +2 more
Ulysses had a "distant encounter" with Jupiter when it was within 0.8 AU of the planet during February, 2004. The passage of the spacecraft was from north to south, and observations of the Jovian radio waves were carried out for a few months from high to low latitudes (+80° to +10°) of Jupiter. The statistical study performed during this "distant …
Suzaku Observation of the Anomalous X-Ray Pulsar CXOU J164710.2--455216
Dotani, Tadayasu; Enoto, Teruaki; Kokubun, Motohide +11 more
A Suzaku TOO observation of CXOU J164710.2-455216 was performed on 2006 September 23-24 for a net exposure of 38.8ks. Pulsations were clearly detected in the XIS light curves with a pulse period of 10.61063(2)s. The XIS pulse profile is found to be highly non-sinusoidal. It shows 3 peaks of different amplitudes with an RMS fractional amplitude of …
The changing face of Titan
Lorenz, Ralph D.
Long-Term Study of Active Spacecraft Potential Control
Eriksson, A. I.; Lindqvist, P. -A.; Torkar, K. +1 more
On the possibility of microbiota transfer from Venus to Earth
Wickramasinghe, N. C.; Wickramasinghe, J. T.
The possibility of the clouds of Venus providing habitats for extremophilic microorganisms has been discussed for several decades. We show here that the action of the solar wind leads to erosion of parts of the atmosphere laden with aerosols and putative microorganisms, forming a comet-like tail in the antisolar direction. During inferior conjunct…
An Overdensity of i-Dropouts among a Population of Excess Field Objects in the Virgo Cluster
Hathi, Nimish P.; Yan, Haojing; Windhorst, Rogier A.
Using a set of deep imaging data obtained by the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST) shortly after its deployment, Yan, Windhorst, & Cohen found a large number of F775W-band dropouts (i-dropouts), which are consistent with being galaxies at z ≈ 6. The surface density of i-dropouts thus derived, however, is an …
XMM-Newton Observation of the Northeastern Limb of the Cygnus Loop
Tsunemi, Hiroshi; Miyata, Emi; Nemes, Norbert
In this paper we performed moderate-resolution spectroscopy on the data obtained with XMM-Newton of the northeastern limb of the Cygnus Loop. This observation was proposed as a higher resolution follow-up to that made by ASCA. We investigated the radial variation of the temperature, ionization timescale, elemental abundances, and hydrogen column d…
Inaccuracies in the spectral classification of stars from the Tycho-2 Spectral Type Catalogue
Tsvetkov, A. S.; Popov, A. V.; Smirnov, A. A.
We compare the spectroscopic and trigonometric parallaxes of common stars from the Tycho-2 Spectral Type and Hipparcos Catalogues. This comparison has revealed that the distance estimations for the overwhelming majority of stars by both methods yield very similar results. However, there is a small fraction of stars for which the distance estimates…
Studies of Zonal Flows Driven by Drift Mode Turbulence in Laboratory and Space Plasmas
Davies, J. A.; Vaivads, A.; Dunlop, M. W. +8 more
The interaction between broadband drift mode turbulence and zonal flows is an important topic associated with transport at plasma boundaries. The generation of zonal flows by the modulational instability of broad band drift waves has resulted in the observation of self organized solitary wave structures at the magnetopause. To understand these str…