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Dust Activity in Comet 67P/Churyumov–Gerasimenko from February 20 to April 20, 2003
Lara, L. M.; Gutiérrez, P. J.; Licandro, J. +1 more
Broadband imaging of Comet 67P/Churyumov–Gerasimenko has provided more data on the characterisation of the target of the ESA Rosetta Mission. The comet monitoring between rh=2.37 and rh=2.78 AU postperihelion shows a prominent dust coma which extends up to ≈ 25,000 km from the nucleus, and a long dust structure in approximate…
Origin and Acceleration of the Slow Solar Wind
Habbal, Shadia Rifai; Woo, Richard
This Letter uses Doppler dimming measurements by SOHO UVCS to elucidate the origin and acceleration of the slow solar wind. By investigating plasma flow in the corona over an active region during 2000 May 14-16, we confirm what has been suggested by the presence of the imprint of active regions in the solar wind near Earth orbit, that active regio…
Ionospheric signatures of plasma injections in the cusp triggered by solar wind pressure pulses
Cerisier, Jean-Claude; Marchaudon, AuréLie; Bosqued, Jean-Michel +7 more
We describe coordinated observations made on 14 July 2001 simultaneously in the midaltitude cusp by Cluster and at the cusp's ionospheric magnetic footprint by Super Dual Auroral Radar Network (SuperDARN) and Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) during a period of three successive solar wind dynamic pressure pulses. In asso…
High-Altitude CUSP: The Extremely Dynamic Region in Geospace
Chen, Jiasheng; Fritz, Theodore A.
The high-altitude dayside cusps (both northern and southern) are extremely dynamic regions in geospace. Large diamagnetic cavities with significant fluctuations of the local magnetic field strength have been observed there. These cusp diamagnetic cavities are always there day after day and are as large as 6 RE Associated with these cavi…
The star formation history of the LSB galaxy UGC 5889
Bomans, D. J.; Vallenari, A.; Schmidtobreick, L.
We present HST photometry of the LSB galaxy UGC 889 and derive its recent star formation history. In the last 200 Myr the star formation proceeded in modest bursts at a rate of the order of 10-2-10-3 M⊙/yr, with periods of extremely low SFR or even quiescence. The rate derived from the present study for the last 20…
XMM spectroscopy of the transient supersoft source RXJ0513.9 - 6951: probing the dynamic white dwarf photosphere
Charles, P. A.; Heathcote, B.; McGowan, K. E. +3 more
The highly luminous (>1037ergs-1) supersoft X-ray sources (SSSs) are believed to be Eddington-limited accreting white dwarfs undergoing surface hydrogen burning. The current paradigm for SSSs involves thermally unstable mass transfer from a 1-2Msolar companion. However, this model has never been directly confirm…
Magnetic White Dwarfs in the Two Micron All Sky Survey: A Search for Candidate Binary Systems
Hoard, D. W.; Wachter, Stefanie; Howell, S. B. +2 more
Our understanding of the formation and evolution of magnetic cataclysmic variables from initially detached, post-common-envelope binary stars containing a magnetic white dwarf and a main-sequence star is currently poorly constrained, due to the lack of observational identification of the progenitor systems. Very few potential pre-cataclysmic varia…
The cool wake around 4C 34.16 as seen by XMM-Newton
Hardcastle, M. J.; Ponman, T. J.; Stevens, I. R. +3 more
We present XMM-Newton observations of the wake-radio galaxy system 4C 34.16, which shows a cool and dense wake trailing behind the host galaxy of 4C 34.16. A comparison with numerical simulations is enlightening, as they demonstrate that the wake is produced mainly by ram pressure stripping during the galactic motion through the surrounding cluste…
Evolution of the Dependence of Rest-Frame Color and Morphology Distribution on Stellar Mass for Galaxies in the Hubble Deep Field-North
Yamada, T.; Kajisawa, M.
Using very deep Subaru K'-band imaging and archival Hubble Space Telescope WFPC2/NICMOS data of the Hubble Deep Field-North, we investigate the evolution of the stellar mass, color, and morphology of galaxies to z~3. We mainly examine the rest-frame U-V color distribution of galaxies as a function of stellar mass. At 0.3<~z<~2, galaxies seem…
Discovery of CH and OH in the -513 km s-1 Ejecta of η Carinae
Gull, T. R.; Nielsen, K. E.; Bruhweiler, F. +3 more
The very massive star η Carinae (η Car) is enshrouded in an unusual complex of stellar ejecta, which is highly depleted in C and O and enriched in He and N. This circumstellar gas gives rise to distinct absorption components corresponding to at least 20 different velocities along the line of sight. The velocity component at -513 km s-1 …