ASTRONOMY AND ASTROPHYSICS A kinematical analysis of NGC 2992. Abstract. We present long slit spectroscopy for the [OIII] and Hα wavelength ranges along nine different position angles for the Sa Seyfert 1.9 galaxy NGC 2992. Double profiles are present in several regions, suggesting that the gas is not simply following galaxy rotation. A simple kinematical model, which takes into account circula...

Detailed analysis of the spectral lines from two low redshift damped Lyman alpha absorbers (DLA) confirms that they are a heterogeneous population. Both systems have low metal abundances of approximately 0.05 to 0.1 solar. The abundance pattern of the DLA at z = 1.15 towards HE 0515-4414 shows dust depletion comparable to that found in our Galaxy, while the system at z = 0.68 towards HE 1122-16...

Abstract CASA, the Common Astronomy Software Applications, is primary data processing software for Atacama Large Millimeter/submillimeter Array (ALMA) and Karl G. Jansky Very (VLA), frequently used also other radio telescopes. The CASA can handle from single-dish, aperture-synthesis, Long Baseline Interferometery (VLBI) One of its core functionalities to support calibration imaging pipelines AL...

THE PORTRAYAL OF STONEHENGE in the 1960s and 1970s as an astronomical observatory or computer forms one of the most notorious examples known to archaeologists of an age recreating the past in its own image (Hawkes 1966; Castleden 1993, 18-27; Chippindale 1994, 230-1). Despite persistent popular belief, detailed reassessments of the ideas of C.A. Newham, Gerald Hawkins, Fred Hoyle and others hav...

Mazur Group (Harvard University). A Harvard research group that includes education research as well as physics research. The site offers links to ongoing research into peer instruction, gender and physics, the value of classrooms demonstrations, and technology and education. The link below is to the portion of their website on Learning Science. http://mazur.harvard.edu/education/educationmenu.p...

ASTRONOMY AND ASTROPHYSICS Gamma-ray bursts from internal shocks in a relativistic wind : an hydrodynamical study. Abstract. The internal shock model for gamma-ray bursts involves shocks taking place in a relativistic wind with a very inhomogeneous initial distribution of the Lorentz factor. We have developed a 1D lagrangian hydrocode to follow the evolution of such a wind and the results we ha...

The O/H metallicity distribution of different samples of planetary nebulae in the bulge of the Milky Way and M31 are compared. O/H abundances are converted into [Fe/H] metallicity by the use of theoretical [O/Fe] × [Fe/H] relationships both for the bulge and the solar neighbourhood. It is found that these relationships imply an offset of [Fe/H] abundances by a factor up to 0.5 dex for bulge neb...

We present a catalogue of velocities for 466 galaxies in the direction of the cluster ABCG 496 , in a region covering about 160’×160’ (9.2×9.2 Mpc for an average redshift for ABCG 496 of 0.0331, assuming H0=50 km s Mpc). This catalogue includes previously published redshifts by Proust et al. (1987), Quintana & Ramı́rez (1990) and Malumuth et al. (1992), redshifts from the CfA redshift survey, to...

In this paper I present a new two-dimensional decomposition technique, which models the surface photometry of a galaxy with an exponential light profile for both bulge and disk and, when necessary, with a Freeman bar. The new technique was tested for systematic errors on both artificial and real data and compared with widely used one-dimensional decomposition techniques, where the luminosity pr...