Astrophysical: Density wave model

  • Publication
    Constraints on theories of galaxy formation from measurements of fluctuations in the CMB

    Current observational constraints on anisotropies in the cosmic microwave background (CMB) and on the clustering of galaxies have considerably narrowed the...

  • Publication
    Density wave triggered star formation in grand design spirals

    In normal spiral galaxies the arms are the main sites for star formation. This is the cause of their optical contrast compared with the rest of the disc. The...

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    Efficiency of massive star formation in grand design spirals

    The present study estimates the efficiency ratio for massive star formation between the arms and the interarm disks of three grand design spirals. The estimate...

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    Evidence for coherent star-forming processes in the discs of spirals

    This paper presents examples of star-forming phenomena in the discs of spirals which show symptoms of phase-coherence over kpc scales. Cases are found where...

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    Evidence for leading spiral arm formation in NGC 7479

    Azimuthal profiles of the spiral NGC 7479 in the B and I passbands have been analyzed using a subset of the azimuthal parameters proposed by Beckman and Cepa...

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    Local approximations to non-linear evolution of density fluctuations

    The way in which the evaluation of any moment of the mass distribution, as given by the Zeldovich (1970) approximation, may be reduced to the computation of an...

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    Star formation efficiency patterns in the spiral arms of M51

    The distribution of ionized, molecular, and atomic hydrogen in the disk and especially along the spiral arms of the Whirlpool galaxy, M51, is investigated by...

  • Publication
    The nature of arms in spiral galaxies. I - Azimuthal colour profiles of NGC 7479 and NGC 1832

    A set of parameters to characterize azimuthal profiles of galaxies is proposed and applied to the spiral structure of the galaxies NGC 1832 and NGC 7479...

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    The striking near-infrared morphology of the inner region in M100

    New optical and near-infrared (NIR) K-band images of the inner 3 kpc region of the nearby Virgo spiral M100 (NGC 4321) display remarkable morphological changes...