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  • 1
    Electronic Resource
    Electronic Resource
    Absorption Lines in the Spectra of Quasistellar Objects (1981)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 19 (1981), S. 41-76 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.19.090181.000353
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A high deuterium abundance at redshift z = 0.7 (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 388 (1997), S. 250-252 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Of the light elements, the primordial abundance of deuterium relative to hydrogen, (D/H)p, provides the most sensitive diagnostic for the cosmological mass density parameter, ΩB. Recent high-redshift D/H measurements are highly discrepant, although this may reflect ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/388250a0
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  • 3
    Electronic Resource
    Electronic Resource
    Probing the early Universe (1987)
    [s.l.] : Nature Publishing Group
    Nature 328 (1987), S. 376-378 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FOR those interested in the history and the ultimate fate of the Universe, quasars have been a source both of hope and of frustration. Hope because quasars are so bright, and seen at such large distances, that in the highest-redshift cases we see them as they were when the Universe was at most ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/328376b0
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  • 4
    Electronic Resource
    Electronic Resource
    Million-light-year galaxies and spectral forests (1995)
    [s.l.] : Nature Publishing Group
    Nature 374 (1995), S. 500-501 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SPECTRA of high-redshift quasars invari-ably show a veritable forest of absorption lines at wavelengths below that of the Lyman-a emission line arising in the quasar itself. These are due to hydrogen in gas clouds at redshifts below that of the quasar; corresponding heavy element ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/374500a0
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  • 5
    Electronic Resource
    Electronic Resource
    0957 + 561 A, B: twin quasistellar objects or gravitational lens? (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 381-384 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] 0957 + 561 A, B are two QSOs of mag 17 with 5.7 arc s separation at redshift 1.405. Their spectra leave little doubt that they are associated. Difficulties arise in describing them as two distinct objects and the possibility that they are two images of the same object formed by a gravitational ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279381a0
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  • 6
    Electronic Resource
    Electronic Resource
    A galaxy for quasar 3C48 (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 395-396 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE superb observations by Boroson and Oke reported in this issue of Nature (see p.397) reveal that the faint nebulosity to the north and south of the quasar 3C48 is dominated by starlight and that the stars have a redshift close to that determined from the broad emission lines in the quasar ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/296395a0
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  • 7
    Electronic Resource
    Electronic Resource
    Redshift of OH471 (1973)
    [s.l.] : Nature Publishing Group
    Nature 242 (1973), S. 394-395 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The position and identification of the radio source OH471 were communicated to us by C. Hazard and are based on the accurate positional work of the group at the Royal Radar Establishment. The source had previously been identified by Gearhart, Lund, Frantz and Kraus1 who also publish a finding ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/242394a0
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  • 8
    Electronic Resource
    Electronic Resource
    Galactic chemical evolution (1989)
    [s.l.] : Nature Publishing Group
    Nature 341 (1989), S. 692-693 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DISTANT galaxies, that is those at high redshift, are seen as they were at a much earlier epoch in the history of the Universe. From their forms and distributions, it is hoped to learn what unseen effects in earlier epochs led to their formation. From their spectra, it is hoped to learn their ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/341692b0
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  • 9
    Electronic Resource
    Electronic Resource
    Heavy element abundances in absorption line systems towards Q2206-199N (1986)
    Springer
    Astrophysics and space science 118 (1986), S. 499-500 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spectroscopy of thez=2.0763 absorption line system in A2206-199N shows that it has a very large hydrogen column density (5×1020 cm−2) but extremely weak absorption due to heavy elements. We discuss the possibility that the gas cloud causing this absorption system may be exceptionally metal-poor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651175
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  • 10
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    A self-consistent model for the evolution of the gas produced in the debris disc of {beta} Pictoris (2016)
    Oxford University Press
    Details
    Publication Date: 2016-07-02
    Description: This paper presents a self-consistent model for the evolution of gas produced in the debris disc of β Pictoris. Our model proposes that atomic carbon and oxygen are created from the photodissociation of CO, which is itself released from volatile-rich bodies in the debris disc due to grain–grain collisions or photodesorption. While the CO lasts less than one orbit, the atomic gas evolves by viscous spreading resulting in an accretion disc inside the parent belt and a decretion disc outside. The temperature, ionization fraction and population levels of carbon and oxygen are followed with the photodissociation region model cloudy , which is coupled to a dynamical viscous α model. We present new gas observations of β Pic, of C i observed with Atacama Pathfinder EXperiment and O i observed with Herschel , and show that these along with published C ii and CO observations can all be explained with this new model. Our model requires a viscosity α 〉 0.1, similar to that found in sufficiently ionized discs of other astronomical objects; we propose that the magnetorotational instability is at play in this highly ionized and dilute medium. This new model can be tested from its predictions for high-resolution ALMA observations of C i . We also constrain the water content of the planetesimals in β Pic. The scenario proposed here might be at play in all debris discs and this model could be used more generally on all discs with C, O or CO detections.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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