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The ROSAT Deep Cluster Survey: Constraints on Cosmology
S. Borgani, P. Rosati, R. Della Ceca +2
We use the ROSAT Deep Cluster Survey (RDCS) to trace the evolution of the cluster abundance out to and constrain cosmological models. We resort to a phenomenological…
Evolved Super Star Clusters in M82
R. de Grijs, R. W. O'Connell, J. S. Gallagher
We present high-resolution optical and near-infrared HST observations of two adjacent regions in the fossil starburst region in M82, B1 and B2. Age estimates date the cluster popul…
LASCO Measurements of the Energetics of Coronal Mass Ejections
Angelos Vourlidas, Prasad Subramanian, K. P. Dere +1
We examine the energetics of Coronal Mass Ejections (CMEs) with data from the LASCO coronagraphs on SOHO. The LASCO observations provide fairly direct measurements of the mass, vel…
Near-Infrared Emission Line Searches for High-Redshift Galaxies
Andrew Bunker
In this article I review recent developments in near-infrared emission line searches for star-forming galaxies at high redshift. Using the J-, H- & K-bands we can potentially chart…
X-ray/TeV-gamma-ray observations of several strong flares of Mkn 501 during 1997 and implications
H. Krawczynski, P. S. Coppi, T. Maccarone +1
During more than 6 months in 1997, the BL Lac object Mkn 501 was in an exceptionally bright state, both in the X-ray band and in the Very High Energy (VHE) band. In this paper we p…
Detection of new emission components in PSR B0329+-54
R. T. Gangadhara, Y. Gupta, D. R. Lorimer
To study the structure of emission beam, we have analysed the single pulse data of PSR B0329+-54 at 325 and 606 MHz. In order to unambiguously detect the weak emission components,…
5 radio sources of the Zenith survey at RATAN-600: VLA maps, radio spectra and optical identification
Yu. N. Parijskij, W. M. Goss, O. V. Verkhodanov +3
VLA maps obtained at 1.4 GHz with a resolution of 2\farcs52\arcsec for three sources and 6\farcs52\farcs3 for two sources detected in the RATAN-600 Zenith survey of…
Phase boundary dynamics in a one-dimensional non-equilibrium lattice gas
G. Oshanin, J. De Coninck, M. Moreau +1
We study dynamics of a phase boundary in a one-dimensional lattice gas, which is initially put into a non-equilibrium configuration and then is let to evolve in time by particles p…
On the axis ratio of the stellar velocity ellipsoid in disks of spiral galaxies
P. C. van der Kruit, R. de Grijs
The spatial distribution of stars in a disk of a galaxy can be described by a radial scale length and a vertical scale height. The ratio of these two scale parameters contains info…
Segregation of polydisperse granular media in the presence of a temperature gradient
S. Luding, O. Strauss, S. McNamara
Granular media are examined with the focus on polydisperse mixtures in the presence of two localized heat-baths. If the two driving energies are similar, the large particles prefer…
Survey of Large Planetary Nebulae in Decay
Thomas Rauch, Elise Furlan, Florian Kerber +1
The Planetary Nebulae (PNe) return nuclear processed stellar material back to the interstellar medium (ISM) and thus have an important influence on the chemical evolution of our Ga…
Is I Zw 18 a young galaxy?
Y. I. Izotov, P. Papaderos, T. X. Thuan +3
Hubble Space Telescope (HST) colour - magnitude diagrams in B, V and R along with long-slit Multiple Mirror Telescope (MMT) spectrophotometric data are used to investigate the evol…
Water Vapor Absorption in Early M-type Stars
M. Matsuura, I. Yamamura, H. Murakami +2
The spectrometers onboard the Infrared Telescope in Space (IRTS) reveal water vapor absorption in early M-type stars, as early as M2. Previous observations detected H_2O vapor abso…
Extremely Red Galaxies
Paola Andreani, Andrea Cimatti, Huub Roettgering +1
Preliminary results of a project aiming at unveiling the nature of the extremely red galaxies (ERGs) (objects with colours R-K>6 and I-K>5) found in deep optical-NIR surveys are pr…
PKS2250-41 and the role of jet-cloud interactions in powerful radio galaxies (full paper)
M. Villar-Martin, C. Tadhunter, R. Morganti +2
We present high resolution, long-slit spectra of the jet-cloud interaction in the powerful southern radio galaxy PKS2250-41. We have resolved the emission lines into two main kinem…
Combined study of KNbO3 and KTaO3 by different techniques of photoelectron and X-ray emission spectroscopy
A. V. Postnikov, B. Schneider, M. Neumann +5
The new results are presented of the experimental study of KNbO3 and KTaO3 by means of X-ray photoelectron spectroscopy, soft X-ray emission and X-ray fluorescence spectroscopy. In…
On the Discontinuity of Electrostatic Fields Across a Planar Surface With Multipolar Surface Charge Density
S. Gov, S. Shtrikamn, H. Matzner
We use covariance and dimensional analysis to find expressions for the discontinuity of the potential and normal electric field across a flat surface with multipolar charge surface…
PKS2250-41 and the role of jet-cloud interactions in powerful radio galaxies
M. Villar-Martin, C. Tadhunter, R. Morganti +2
We have studied the effects of the interaction between the radio jet and the ambient gas in the powerful radio galaxy PKS2250-41 (z=0.31). Our results show that the gas has been ac…