Search Publications
Tentative detection of micron-sized forsterite grains in the proto-planetary disk surrounding HD 100453
Waters, L. B. F. M.; Dominik, C.; van Boekel, R. +4 more
We have re-analyzed the ISO-SWS spectrum of the intermediate mass pre-main-sequence star HD 100453. We confirm the weakness of the 10 µm amorphous silicate band. We have found strong indications of the presence of a crystalline silicate emission at 34 µm, which had escaped detection so far due to severe glitches in the data. The 23.5 a…
Meteoroid Streams Associated to Comets 9P/Tempel 1 and 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P.; Vaubaillon, J.
The meteoroid streams associated to short-period comets 9P/Tempel 1 (the target of the Deep Impact mission). and 67P/Churyumov-Gerasimenko (the target of the Rosetta mission) are studied. Their structure is overwhelmingly under the control of Jupiter and repeated relatively close encounters cause a reversal of the direction of the spati…
The double radio source 3C 343.1: A galaxy-QSO pair with very different redshifts
Burbidge, E. M.; Arp, H.; Burbidge, G.
The strong radio source 3C 343.1 consists of a galaxy and a QSO separated by no more than about 0.25''. The chance of this being an accidental superposition is conservatively ∼1×10-8. The z=0.344 galaxy is connected to the z=0.750 QSO by a radio bridge. The numerical relation between the two redshifts is that predicted from p…
Proper Motions of 59 766 Stars Absolutized Using Galaxies in 149 Sky Fields (PUL2)
Bobylev, V. V.; Shakht, N. A.; Bronnikova, N. M.
The PUL2 catalog has been photographically compiled in Pulkovo according to Deutch's plan. The catalog contains the mean coordinates of stars in the ICRS system at epoch J2000.0 and their original absolute proper motions. The photographic observations were performed with a normal astrograph. The first and second epochs of the photographic plates a…
Dark baryons not in ancient halo white dwarfs
McCracken, H. J.; Reylé, C.; Robin, A. C. +5 more
Having ruled out the possibility that stellar objects are the main contributor of the dark matter embedding galaxies, microlensing experiments cannot exclude the hypothesis that a significant fraction of the Milky Way dark halo might be made of MACHOs with masses in the range 0.5-0.8 M⊙. Ancient white dwarfs are generally considered the…
XMM-Newton Observation of the Narrow-Line QSO PHL 1092: Detection of a High and Variable Soft Component
Rao, A. R.; Dewangan, G. C.; Dasgupta, Surajit
We present results based on an XMM-Newton observation of the high-luminosity narrow-line QSO PHL 1092 performed in 2003 January. The 0.3-10 keV spectrum is well described by a model that includes a power law (Γ~2.1) and two blackbody components (kT~130 eV and kT~50 eV). The soft X-ray excess emission is featureless and contributes ~80% to the tota…
Two Active Nuclei in 3C 294
Stockton, Alan; Canalizo, Gabriela; Ridgway, Susan E. +1 more
The z=1.786 radio galaxy 3C 294 lies < 10" from a 12 mag star and has been the target of at least three previous investigations using adaptive optics (AO) imaging. A major problem in interpreting these results is the uncertainty in the precise alignment of the radio structure with the H- or K-band AO imaging. Here we report observations of the …
X-ray detections of two young bona-fide brown dwarfs
Bouy, H.
I report the detection of two bona-fide brown dwarfs by XMM-Newton:
Magnetic signatures of Jupiter's bow shock during the Cassini flyby
Dougherty, Michele K.; Crary, F.; Young, D. T. +1 more
The bow shock crossings detected during the Cassini flyby of Jupiter occur at positions which imply that Jupiter's bow shock was relatively inflated during the early (before 2001, Day 3) and late (after 2001, Day 40) periods of the encounter. A variety of magnetic shock signatures are seen, corresponding to a wide range (15-75 degrees) in the angl…
Cluster observations of a complex high-altitude cusp passage during highly variable IMF
Balogh, A.; Lavraud, B.; Rème, H. +12 more
On 26 February 2001, the Cluster spacecraft were outbound over the Northern Hemisphere, at approximately 12:00 MLT, approaching the magnetosheath through the high-altitude (and exterior) cusp region. Due to macroscopic motions of the cusp, the spacecraft made multiple entries into the exterior cusp region before exiting into the magnetosheath, pre…