Search Publications

Star-forming galaxies at very high redshifts

Lanzetta, Kenneth M.; Yahil, Amos; Fernández-Soto, Alberto

Analysis of the deepest available images of the sky, obtained by the Hubble Space Telescope, reveals a large number of candidate high-redshift galaxies. A catalogue of 1,683 objects is presented, with estimated redshifts ranging from z = 0 to z > 6. The high-redshift objects are interpreted as regions of star formation associated with the proge…

Sub-galactic clumps at a redshift of 2.39 and implications for galaxy formation

Keel, W. C.; Odewahn, S. C.; Windhorst, R. A. +1 more

A large number of very faint, compact objects have been found at a redshift of 2.39 in optical images of the distant Universe. The objects appear to be star-forming spheroids smaller than the bulge of a spiral galaxy; they are much smaller and fainter than typical galaxies seen today. These objects may be part of a reservoir from which many of tod…

Abundance of ³He in the local interstellar cloud

Gloeckler, George; Geiss, Johannes

THE primordial abundances of the light elements and their isotopes provide essential information regarding the nucleosynthetic processes that occurred in the Big Bang^1,2. At present the best estimates of the baryon/photon ratio of the Universe, a fundamental cosmological parameter, are extrapolations to primordial times of light-element…

Rapid energy dissipation and variability of the lo-Jupiter electrodynamic circuit

Prangé, Renée; Rego, Daniel; Ip, Wing +3 more

THE electrodynamic interaction between Jupiter and the closest of its large moons, Io, is unique in the Solar system. Io's volcanoes eject a considerable amount of material into the inner jovian system (>1 tonne per second), much of it in the form of ions¹; the motion of Io through Jupiter's powerful magnetic field in turn generates …

The boron isotope ratio in the interstellar medium

Federman, S. R.; Lambert, David L.; Cardelli, Jason A. +1 more

OBSERVATIONS of the abundances of elements provide insight into their production and distribution. The production of light elements (in particular, lithium, beryllium and boron) is dominated by spallation reactions¹, in which cosmic rays break apart more massive nuclei. Models^2,3 suggest that the ¹¹B/¹⁰B…

Cool gaze at heartless galaxies

Gilmore, Gerry