Showing papers by "Jeremiah P. Ostriker published in 1972"
192 citations
TL;DR: In this paper, the mass loss for hyperbolic collisions in the E1 galaxy NGC 3379 was calculated on an approximate but conservative basis using models based on the density distribution observed in the galaxy and showed that large numbers of stars will be evaporated from elliptical members of dense clusters of galaxies.
Abstract: Stars will be liberated from the outer portions of galaxies which interact tidally. Using models based on the density distribution observed in the E1 galaxy NGC 3379, the mass loss is computed for hyperbolic collisions on an approximate but conservative basis. Binary collisions are then summed to show that large numbers of stars will be evaporated from elliptical members of dense clusters of galaxies. An estimate of one trillion solar masses is obtained for the amount of material dispersed in the Coma cluster, and in rich very dense systems (Morgan's Type I) the large amount of tidally dispersed debris may constitute the centrally located galaxies designated cD systems which often dominate these clusters.
111 citations
TL;DR: In this article, the electromagnetic wave theory of pulsars is correct, and particle acceleration occurs within the nebulous debris of the supernova explosion, and both the electronic and the ionic components of the galactic cosmic rays can be maintained by particles accelerated in supernova remnants.
Abstract: If the electromagnetic wave theory of pulsars is correct, then particle acceleration occurs within the nebulous debris of the supernova explosion. Model calculations show that each event produces about ${10}^{49}$ erg in ionic cosmic rays. Particle energies range from ${10}^{9}$ to ${10}^{16}$ eV (with spectral index \ensuremath{\sim} 2 before corrections for losses), and the chemical composition is mostly that of matter processed through several stages of nuclear burning. Both the electronic and the ionic components of the galactic cosmic rays can be maintained by particles accelerated in supernova remnants.
58 citations
TL;DR: Two classes of models are current for η Carinae, a star which is perhaps the most luminous (∼1040 erg s−1) known within our Galaxy according to one model this object is a very massive star which ejected a fraction of a solar mass in a major outburst observed during the mid-nineteenth century.
Abstract: TWO classes of models are current for η Carinae, a “star” which is perhaps the most luminous (∼1040 erg s−1) known within our Galaxy According to one model this object is a very massive star, which ejected a fraction of a solar mass in a major outburst observed during the mid-nineteenth century1,2 The ejecta became visually opaque as dust grains formed, reradiating the absorbed stellar radiation in the infrared The visual emission-line spectrum is then supposed to come from photoionized gas within the dust shell The other type of model proposes, instead, a very massive and therefore slow supernova remnant at present receiving energy from a central pulsar; in this case much of the observed infrared radiation is non-thermal3
7 citations