Bibcode
DOI
Prieto, M.; Gottesman, S. T.; Aguerri, J. A. L.; Varela, A. M.
Bibliographical reference
The Astronomical Journal, v. 114, p. 1413.
Advertised on:
10
1997
Citations
41
Refereed citations
37
Description
In the context of a more extensive project, a study of the structural
components of the barred spiral galaxy NGC 5850 is presented here, using
U, B, V, R, and I photometry. After subtracting a bulge+disk model from
the observed image, we obtain the bars, rings and other non-axisymmetric
structures. We fit two-dimensional analytic functions for each
component, giving their scale parameters. In this galaxy the star
formation regions coincide to a first order with the neutral gas
concentrations. The central region is very rich in structure, which
includes a nuclear ring and a nuclear bar, like a replica of the outer
structure, and a giant red region. The principal bar is fiat, the inner
ring is elliptical and is situated at the end of the bar, and the two
spiral arms begin just outside the inner ring and before the ends of the
bar. Beyond the end of the bar, the spiral arms meet again, forming an
outer pseudo-ring. The west arm is tom and broken, probably due to an
interaction with an object situated to the NW, most likely NGC 5846. We
interpret a sudden change in the ellipticity and position angle of the
isophotes at the end of the nuclear bar 9.7"±0.5" from the center
(projected distance), in terms of the orientation of the principal
stellar orbits that compose the bars and conclude that the ILR is
located at this radius.