Discovery of a nearby isolated neutron star
Article Abstract:
Satellite Rosat has identified the existence of an isolated neutron star. Although the Milky Way is predicted to have between a hundred million to a billion neutron stars, only 600 pulsars are known. Some 2,000 isolated neutron stars are believed to exist as hot thermal sources that emit X-rays when their surfaces cool or when they accrete gas from the interstellar medium. The isolated neutron star identified by Rosat is estimated at a distance of around 100 parsecs. Its discovery underscores the need for creating new techniques to make searching for neutron stars more efficient.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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The optical counterpart of the isolated neutron star RX J185635-3754
Article Abstract:
Neutron stars are extremely dense, making them ideal subjects for studying the equation of state nuclear matter, but it is crucial that neutron star masses and radii are accurately measured. While the masses of neutron stars in binary systems are relatively easy to measure, radii are more difficult, requiring detection of thermal radiation from their surfaces, generally masked by pulsed radiation. The detection of the optical counterpart of lone star RX J185635-3754 indicates a radius of less than 14 km, inconsistent with many equations of state that have been proposed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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A nearby massive galaxy cluster behind the Milky Way
Article Abstract:
The mass of Abell 3627 (A3627), a galaxy cluster located 9 degrees from the centre of Great Attractor, is approximately 5 x 10 to the fifteenth power solar masses. The viral theorem utilizing the formalism M = 9R(sub eff)-sigma(super 2)/G determines the mass of A3627. The redshift of the cluster lies adjacent to the bottom of the Attractor's gravitational potential well. The density of the cluster is 10 times more at the southeast of the centre of Great Attractor.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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