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  • 1
    Electronic Resource
    Electronic Resource
    The Structure of the Galaxy (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 596 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb27407.x
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  • 2
    Electronic Resource
    Electronic Resource
    GALACTIC BULGES (1997)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 35 (1997), S. 637-675 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Notes: Abstract We discuss the present observational and theoretical understanding of the stellar populations of bulges and their implications for galaxy formation and evolution. The place of bulges as key to the Hubble Sequence remains secure, but some old paradigms are giving way to new ones as observations develop. Detailed studies of Local Group bulges and haloes provide a basis on which we consider higher redshift data. We present the evidence for and against the currently common preconceptions that bulges are old, above solar metallicity in the mean, and simply scaled-down versions of ellipticals. We conclude life is not so simple: Bulges are diverse and heterogeneous, and although their properties vary systematically, sometimes they are reminiscent of disks, sometimes of ellipticals. The extant observational data are, however, limited. New and future surveys will rectify this, and we discuss the questions those data will address.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.astro.35.1.637
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  • 3
    Electronic Resource
    Electronic Resource
    Is PKS1921 – 29 a quasar with correlated radio and optical variations? (1980)
    [s.l.] : Nature Publishing Group
    Nature 287 (1980), S. 612-613 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Quasar PKS1921-29 has been monitored since 1975.6 at Mount John University Observatory of the University of Canterbury, New Zealand, as part of a larger quasar patrol programme4'5. All 27 observations available were taken with an unfiltered S20R photocathode image intensifier camera (effective ? ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/287612a0
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  • 4
    Electronic Resource
    Electronic Resource
    Star formation in galactic spiral arms (1982)
    [s.l.] : Nature Publishing Group
    Nature 297 (1982), S. 179-180 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] TWO-THIRDS of all bright galaxies show spiral structure, with the arms being made visible by young luminous stars and the giant gas clouds which are the sites of continuing star formation. The relation between the existence of the arms and the young stars which delineate them is analogous to the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/297179a0
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  • 5
    Electronic Resource
    Electronic Resource
    The nature of galactic shells (1982)
    [s.l.] : Nature Publishing Group
    Nature 295 (1982), S. 97-98 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE outer regions of galaxies are rapidly becoming as mysterious as their nuclei. Kinematic studies have shown that the outer regions of disk galaxies like the Milky Way rotate with the same angular velocity as their inner regions, thus requiring the dominant contributor to the total mass of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/295097a0
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  • 6
    Electronic Resource
    Electronic Resource
    Evolution of the Galactic Halo and Disk (1999)
    Springer
    Astrophysics and space science 267 (1999), S. 109-117 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Correlations between stellar kinematics and chemical abundances are fossil evidence for evolutionary connections between Galactic structural components. Extensive stellar surveys show that the only tolerably clear distinction between galactic components appears in the distributions of specific angular momentum. Here the stellar metal-poor halo and the metal-rich bulge are indistinguishable from each other, as are the thick disk and the old disk. Each pair is very distinct from the other. This leads to an evolutionary model in which the metal-poor stellar halo evolves into the inner bulge, while the thick disk is a precursor to the thin disk. These evolutionary sequences are distinct. The galaxy is made of two discrete 'populations', one of low and one of high angular momentum. Some (minor?) complexity is added to this picture by the debris of late and continuing mergers, which will be especially important in the outer stellar halo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002779826607
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  • 7
    Electronic Resource
    Electronic Resource
    Inverse compton scattering in anisotropic synchrotron sources (1981)
    Springer
    Astrophysics and space science 79 (1981), S. 483-490 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Models of compact, high brightness temperature sources such as quasars and active galactic nuclei often predict substantial inverse-compton scattered flux to be produced at high frequencies. As these fluxes are not observed, it is necessary to assume that extreme relativistic and/or anisotropic effects dominate the source. The often used equations to include these effects however are derived with several simplifying assumptions, which may not always be consistent with the derived source parameters (for example, the assumption of no time dependence in a violently variable quasar may not be appropriate). We therefore present here an explicit derivation of the dependence of the rate of inverse compton scattering on anisotropies in the source, to emphasise the importance and number of assumptions required in the derivation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649443
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  • 8
    Electronic Resource
    Electronic Resource
    A new limit on the nature of the galactic missing mass (1983)
    [s.l.] : Nature Publishing Group
    Nature 306 (1983), S. 669-670 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Low-mass luminous stars are very red, and may be readily detected and studied using current red-sensitive photographic emulsions and charged coupled device (CCD) detectors. We are therefore carrying out a survey using red-sensitive plates from the UK Schmidt Telescope in Australia which are scanned ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/306669a0
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  • 9
    Electronic Resource
    Electronic Resource
    Is beryllium in metal-poor stars of galactic or cosmological origin? (1992)
    [s.l.] : Nature Publishing Group
    Nature 357 (1992), S. 379-384 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Standard Big Bang nucleosynthesis predicts a very small primordial abundance of beryllium. Observations of nine very metal-poor stars indicate a beryllium abundance roughly proportional to the oxygen abundance, a trend that can be explained in terms of galactic chemical ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/357379a0
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  • 10
    Electronic Resource
    Electronic Resource
    RG0044–2958: a peculiar M supergiant at a distance of 2.5 Mpc (1981)
    [s.l.] : Nature Publishing Group
    Nature 291 (1981), S. 208-210 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We are presently studying the stellar distribution towards the South Galactic Pole to m 20 in the B, V, R and / passbands, using UK Schmidt Telescope plates measured on the COSMOS facility at the Royal Observatory, Edinburgh. Our primary aim is the determination of the intrinsically faint end of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/291208a0
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