Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993alab.reptt....b&link_type=abstract
Final Technical Report, 1 Jul. 1991 - 30 Jun. 1993 Alabama Univ., Tuscaloosa.
Astronomy and Astrophysics
Astronomy
Barred Galaxies, Infrared Spectra, Orbital Resonances (Celestial Mechanics), Resonance, Ring Galaxies, Spectrum Analysis, Angular Velocity, Data Bases, Far Infrared Radiation, Galactic Nuclei, Galactic Rotation, Galactic Structure, Infrared Astronomy Satellite, Star Formation
Scientific paper
Our study of the Infrared Astronomy Satellite (IRAS) properties of ringed galaxies has been largely successful. We have identified what we think is the probable cause of the differences in the IRAS properties among non-interacting barred galaxies as the pattern speed of the bar. The key to identifying this parameter has been our focusing the study on outer-ringed galaxies where we know precisely what is present in the central regions (from available BVI CCD images in our library of images). The theory is that outer rings, through their morphology and other characteristics, can be identified with the outer Lindblad resonance, one of the major resonances in galaxy structure. Using a library of n-body simulations for comparison, we can reliably infer both low and high pattern speed galaxies from the appearance of outer rings and the existence of other ring features. It is clear that in some barred galaxies, the bar pattern speed is high enough to avoid an inner Lindblad resonance, hence such objects do not contain nuclear or circumnuclear star formation. The IRAS observations are most sensitive to nuclear star formation in early-type barred galaxies, and will thus select those barred galaxies where the pattern speed is low enough to allow an inner Lindblad resonance to exist. High pattern speed barred galaxies therefore weaken the correlation between bars and infrared excess. This finding helps to reconcile the inconsistent results found between different studies on the correlation between bars and far-IR emission.
Buta Ronald J.
Crocker Deborah A.
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