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R. Cowsik
Articles written in Journal of Astrophysics and Astronomy
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Volume 7 Issue 1 March 1986 pp 29-38
Dark matter-systematics of its distribution
The dynamical masses of dwarf-spheroidals, spiral and elliptical galaxies, dwarf irregular binaries, groups of galaxies and clusters are shown to lie in a band about the M ∼ ρR3
line . The value of ρ is approximately the same as that estimated for unseen matter in the solar neighbourhood. The clusters themselves lie about theM ∼ R -3line derived for a self-gravitating neutrino gas; their masses are distributed around the maximum Jeans-mass, MJmax. corresponding to mv - 10 eV in an expanding universe. The present day length scales of clusters and the dispersion in the velocities observed within them are understood in terms of a 100-fold expansion subsequent to the initial growth of the fluctuations at MJmax. These systematics on theR-M plane imply that the initial condensations in the expanding universe are on the scale of the rich clusters of galaxies, these condensations were triggered dominantly by the gravitation of the neutrinos and the constant density of al systems arises naturally due to the embedding of these systems in the large scale neutrino condensations. If the neutrino density falls off asr -2 beyond the cluster edge till the distributions from different clusters overlap, then the mean density of the neutrinos approximately equals the closure density of the universe. -
Volume 18 Issue 4 December 1997 pp 477-489
Questions and comments that followed the panel discussion
J. V. Narlikar T. Padmanabhan Geoff Burbidge H. C. Arp R. Cowsik Arati Chokshi J. C. Pecker Tarun Souradeep Pasupathy Rohini Godbole Gopal Krishna R. Cowsik D. F. Roscoe N. Mukunda
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Journal of Astrophysics and Astronomy
Volume 44, 2023
All articles
Continuous Article Publishing mode
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Journal of Astrophysics and Astronomy | News
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Continuous Article Publication
Posted on January 27, 2016Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.
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Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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