Evidence for leading spiral arm formation in NGC 7479

Details Evidence for leading spiral arm formation in NGC 7479 Evidence for leading spiral arm formation in NGC 7479

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.156..199b&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Statistics

Computation

2

Computational Astrophysics, Galactic Structure, Spiral Galaxies, Charge Coupled Devices, Density Wave Model, Star Formation

Scientific paper

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 (1989), to look for the presence of shock fronts in the arms, as predicted by the density wave theory. The sign of the skewness parameter, showing that beyond the corotation radius the concave side of the southern arm shows steeper profiles in both colors, is an indicator that the arm studied is a 'leading' structure. A color gradient in the arm, with the B intensity peak of the profile nearer to the shock front than the I peck is also measured. The measured angular shift, when converted to time drift assuming that the bar ends near the corotation radius, is consistent with the drift expected for an 'aging' stellar population.

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