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Comparison between the GPM proper motions referred to galaxies and the ACT data.
Rybka, S. P.
Proper motions were derived for 4893 stars in selected areas from combination of source catalogues with galaxies. They were included into the GPM compiled catalogue and compared with the ACT data consistent with the Hipparcos reference system. The results were analysed by the analytical method developed at the Astronomisches Rechen-Institut. The s…
Active galaxies in the mid-infrared
Lutz, D.; Genzel, R.; Sturm, E. +4 more
Coronal holes and solar wind acceleration. Proceedings. SOHO-7 Workshop, Northeast Harbor, ME (USA), 28 Sep - 1 Oct 1998.
Cranmer, S. R.; Kohl, J. L.
The following topics were dealt with: solar coronal holes, solar wind acceleration, solar wind models, high speed solar wind, compositional variations, coronal loops, solar magnetic fields, plasma waves, solar polar region, coronal heating, streamers.
Field Stars and Star Clusters in M31
Jablonka, P.
This review reports on recent results obtained from HST/WFPC2 high resolution observations of field stars and star clusters in the bulge and the halo of the nearby galaxy M31.
The Demography of Massive Dark Objects in Galaxy Centers
Gebhardt, Karl; Richstone, Douglas; Kormendy, John +9 more
We construct dynamical models for a sample of 36 nearby galaxies with Hubble Space Telescope (HST) photometry and ground-based kinematics. The models assume that each galaxy is axisymmetric, with a two-integral distribution function, arbitrary inclination angle, a position-independent stellar mass-to-light ratio Upsilon, and a central massive dark…
Evolutionary models for solar metallicity low-mass stars: mass-magnitude relationships and color-magnitude diagrams
Hauschildt, P. H.; Allard, F.; Baraffe, I. +1 more
We present evolutionary models for low mass stars from 0.075 to 1 M_sun for solar-type metallicities [M/H]= 0 and -0.5. The calculations include the most recent interior physics and the latest generation of non-grey atmosphere models. We provide mass-age-color-magnitude relationships for both metallicities. The mass-M_V and mass-M_K relations are …
Discovery of a supernova explosion at half the age of the Universe
Panagia, N.; Lidman, C.; Aldering, G. +19 more
The ultimate fate of the Universe, infinite expansion or a big crunch, can be determined by using the redshifts and distances of very distant supernovae to monitor changes in the expansion rate. We can now find large numbers of these distant supernovae, and measure their redshifts and apparent brightnesses; moreover, recent studies of nearby type …
An unusual supernova in the error box of the γ-ray burst of 25 April 1998
Piro, L.; Pian, E.; Palazzi, E. +46 more
The discovery of afterglows associated with γ-ray bursts at X-ray, optical and radio wavelengths and the measurement of the redshifts of some of these events, has established that γ-ray bursts lie at extreme distances, making them the most powerful photon-emitters known in the Universe. Here we report the discovery of transient optical emission in…
Rotating Nuclear Rings and Extreme Starbursts in Ultraluminous Galaxies
Downes, D.; Solomon, P. M.
New CO interferometer data show that the molecular gas in infrared ultraluminous galaxies is in rotating nuclear disks or rings. The CO maps yield disk radii, kinematic major axes, rotation speeds, enclosed dynamical masses, and gas masses. The CO brightness temperatures, the double-peaked CO line profiles, the limits on thermal continuum flux fro…
What Powers Ultraluminous IRAS Galaxies?
Lutz, D.; Genzel, R.; Sturm, E. +9 more
We present an ISO SWS and ISOPHOT-S, mid-infrared spectroscopic survey of 15 ultraluminous IRAS galaxies (LIR >= 1012 L⊙). We combine the survey results with a detailed case study, based on arcsecond resolution, near-IR, and millimeter imaging spectroscopy, of one of the sample galaxies (UGC 5101). We compare th…