Interacting elliptical galaxies as hosts of intermediate-redshift quasars
Article Abstract:
All the four quasars, three radio-loud and one radio quiet, observed by the Hubble Space Telescope are present in luminous elliptical rather than spiral galaxies and have very close companions. The galaxies are featureless and the presence of the close companions, too close for coincidental alignments, indicates that interactions are likely. The brightness of quasars is greater than L* galaxies but less than the bright members of the clusters. This evidence supports the theory that quasars are created in relation to the fueling of the nucleus of the host galaxy's central source from interaction or merger created falling matter.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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The boron isotope ratio in the interstellar medium
Article Abstract:
Spectroscopic studies of the interstellar gas between the Earth and the star delta Scorpii put the boron isotope ratio (11B/10B) at around 3.4. The value is formally equal to the standard terrestrial ratio of 4.04558 and compares well with the bulk meteoritic value. The measurements are carried out using the Goddard High-Resolution Spectrograph on the Hubble Space Telescope. The star delta Scorpii is chosen because its direction favours a simple velocity structure for the interstellar gas. The spectral analysis involves determination of the optical depth as a function of velocity.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Newly synthesized lithium in the interstellar medium
Article Abstract:
It has been possible to make observations of 7Li and 6Li abundances in a number of interstellar clouds located in the direction of the star o Persei. The abundance ratio 7Li/6Li was around 2.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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