Bibcode
Beckman, J.; Cepa, J.
Bibliographical reference
(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Phenomena in Galaxies, Puerto de la Cruz, Spain, July 4-15, 1988) Astrophysics and Space Science (ISSN 0004-640X), vol. 156, no. 1-2, June 1989, p. 199-204.
Advertised on:
6
1989
Citations
2
Refereed citations
2
Description
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.