Search Publications
ISO Far-IR spectroscopy of IR-bright galaxies and ULIRGs
Malkan, M. A.; Spinoglio, L.; Lord, S. D. +16 more
Based on far-infrared spectroscopy of a small sample of nearbyinfrared-bright and ultraluminous infrared galaxies (ULIRGs) with theISO Long Wavelength Spectrometer we find adramatic progression in ionic/atomic fine-structure emission line andmolecular/atomic absorption line characteristics in these galaxiesextending from strong [O III]52,88 µ…
The Kinematics and Origin of smr Stars
Grenon, M.
Ages and kinematics are revised for SMR stars ([M/H] >+0.30) common to NLTT and HIPPARCOS catalogues. The origin of MR to SMR stars appears heterogeneous: part of them, of intermediate age, were formed few kpc inside the solar orbit, from slowly enriched gas, whereas the oldest SMRs were born early, closer to the galactic center where the metal…
Heating the Solar Corona by Magnetic Reconnection
Priest, E. R.
Here I review briefly the theory of magnetohydrodynamic reconnection and ask what observational evidence is there that it is heating the corona. In particular, the new directions in which three-dimensional theory for reconnection is heading are outlined. Part of the coronal heating problem has been solved with the identification of reconnection dr…
The Mid-IR view of interacting galaxies
Cesarsky, C.; Sauvage, M.; Vigroux, L. +5 more
In this paper, we present ISOCAM mid-IR broad band images and spectraof three well known interacting galaxies. These are the prototypicalultraluminous IR galaxy Arp 220, and NGC 6240, which are classifiedas major mergers resulting from a collision of two disk galaxies ofapproximately equal mass, and the prime example of collisional ringgalaxies, t…
Cyclotron Heating of the Solar Corona
Marsch, Eckart
A physical model of the solar transition region and corona is presented, in which plasma flows in rapidly-diverging coronal funnels and holes are described within the framework of a two-fluid model including wave-particle interactions. The ions are heated by wave dissipation and accelerated by the pressure gradient of high-frequency Alfvén waves, …
The Darkest Regions of Solar Polar Coronal Holes Observed by SUMER on SOHO
Wilhelm, Klaus
Recent Developments in Quasilinear Cosmic Ray Particle Acceleration Theories
Vainio, Rami; Schlickeiser, Reinhard
Several recent results of quasilinear cosmic ray transport theory are reviewed. It is shown that modelling the plasma turbulence beyond the magnetostatic approximation is most important for a correct description of cosmic ray dynamics. In particular, the effects of finite plasma wave speeds play a crucial role both for the behaviour of the particl…
High Energetic Electrons Accelerated by a Coronal Shock Wave
Mann, G.; Kunow, H.; Motschmann, U. +2 more
Combined SOHO (Solar and Helisopheric Observatory) and ground based radio observations show evidently signatures of electrons accelerated by a shock wave during the event on July 9, 1996. A solar type II radio burst has been received as a signature of a coronal shock wave at 300 MHz on 9:10:54 UT. It was accompanied with electron beams appearing a…
NICMOS observations of two classic AGNS
Thompson, Rodger I.; Corbin, Michael
ISO Spectroscopy of Ultraluminous Infrared Galaxies
Lutz, D.; Genzel, R.; Sturm, E. +5 more
Spectroscopy from the Infrared Space Observatory ISO has for the first timeprovided the sensitivity to exploit the diagnostic power ofmid-infrared fine structure lines and PAH features for the study ofultraluminous infrared galaxies (LIR >1012L⊙). We report on observations obtainedwith SWS, ISOPHOT-S, and the CV…