Browsing Research and Publications - Department of Physics & Astronomy by Author "Salo, H."

Browsing Research and Publications - Department of Physics & Astronomy by Author "Salo, H."

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  • Treuthardt, P.; Salo, H.; Rautiainen, P.; Buta, R. (American Astronomical Society, 2008-06-11)
    We present detailed numerical simulations of NGC 1433, an intermediate-type barred spiral showing strong morphological features including a secondary bar, nuclear ring, inner ring, outer pseudoring, and two striking, ...
  • Laurikainen, E.; Salo, H.; Buta, Ronald J.; Knapen, J. H. (2009-01-21)
    The origin of S0 galaxies is discussed in the framework of early mergers in a cold dark matter cosmology, and in a scenario where S0s are assumed to be former spirals stripped of gas. From an analysis of 127 early-type ...
  • Grouchy, R. D.; Buta, R.; Salo, H.; Laurikainen, E.; Speltincx, T. (American Astronomical Society, 2008-07-31)
    ESO 297-27, an intermediate-to-late-type spiral galaxy, exhibits a rare counter-winding spiral structure in which two sets of nonoverlapping arms open in opposite senses. We imaged ESO 297-27 along with 41 other galaxies ...
  • Buta, R.; Vasylyev, S.; Salo, H.; Laurikainen, E. (2005)
    The distribution of bar strengths in disk galaxies is a fundamental property of the galaxy population that has only begun to be explored. We have applied the bar-spiral separation method of Buta and coworkers to derive the ...
  • Buta, Ronald J.; Laurikainen, E.; Salo, H. (2004)
    The maximum value of the ratio of the tangential force to the mean background radial force is a useful quantitative measure of the strength of nonaxisymmetric perturbations in disk galaxies. Here we consider the distribution ...
  • Rautiainen, P.; Salo, H.; Buta, Ronald J. (2004-04-11)
    ESO 566−24 is an extraordinary barred galaxy that has four regularly spaced spiral arms in blue light images. This type of spiral structure, which is rare among the spiral population, is also clearly seen in near-infrared ...
  • Treuthardt, P.; Salo, H.; Buta, R. (2008-12-02)
    We present dynamical simulations of NGC 2523 and NGC 4245, two barred galaxies (types SB(r)b and SB(r)0/a, respectively) with prominent inner rings. Our goal is to estimate the bar pattern speeds in these galaxies by ...
  • Buta, R.; Laurikainen, E.; Salo, H.; Block, D. L.; Knapen, J. H. (American Astronomical Society, 2006-09-26)
    This paper reports on a near-infrared survey of early-type galaxies designed to provide information on bar strengths, bulges, disks, and bar parameters in a statistically well-defined sample of S0-Sa galaxies. Early-type ...
  • Truethardt, P.; Buta, R.; Salo, H.; Laurikainen, E. (American Astronomical Society, 2007-07-26)
    We have applied the Tremaine-Weinberg continuity equation method to derive the bar pattern speed in the SB(r)b galaxy NGC 2523 and the SB(r)0/a galaxy NGC 4245 using the calcium triplet absorption lines. These galaxies ...
  • Byrd, G.; Rautiainen, P.; Salo, H.; Buta, Ronald J.; Crocker, D. A. (1994-08)
    New test-particle simulations have been carried out to learn more about the secular evolution and morphology of the gaseous and stellar distributions in barred galaxies. We verify the previous results of M. P. Schwarz that ...
  • Grouchy, R. D.; Buta, R. J.; Salo, H.; Laurikainen, E. (American Astronomical Society, 2010-05-10)
    Nonbarred ringed galaxies are relatively normal galaxies showing bright rings of star formation in spite of lacking a strong bar. This morphology is interesting because it is generally accepted that a typical galactic disk ...
  • Laurikainen, E.; Salo, H.; Athanassoula, E.; Bosma, A.; Buta, Ronald J.; Janz, J. (2013-02-26)
    The fractions and dimension of bars, rings and lenses are studied in the near-infrared (IR) S0 galaxy survey, which is a sample of ~200 early-type disc galaxies, mainly S0s. We find evidence that multiple lenses in some ...
  • Buta, Ronald J.; Purcell, Guy B.; Cobb, Melinda Lewis; Crocker, D. A.; Rautiainen, P.; Salo, H. (1999)
    The southern galaxy IC 4214 is a bright, nearby example of a multiple ring early-type spiral galaxy with a weak bar. The galaxy shows three strong pseudoring features, including a nuclear ring, an inner ring, and a prominent ...

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