Intrinsic Bar/Ring Misalignment and a Starburst Nuclear Ring in the Peculiar Spiral Galaxy ESO 565-11

Details Intrinsic Bar/Ring Misalignment and a Starburst Nuclear Ring in the Peculiar Spiral Galaxy ESO 565-11 Intrinsic Bar/Ring Misalignment and a Starburst Nuclear Ring in the Peculiar Spiral Galaxy ESO 565-11

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1588b&link_type=abstract

Astronomical Journal v.110, p.1588

Astronomy and Astrophysics

Astronomy

32

Galaxies: Individual: Eso 565-11, Galaxies: Spiral, Galaxies: Kinematics And Dynamics, Galaxies: Structure

Scientific paper

The southern galaxy ESO 565-11 is a very clear example of a nearly face- on ringed barred spiral where the bar axis and the major axis of the inner ring are significantly misaligned. The object is important because the normal configuration is alignment, based on statistics of apparent bar/ring position angles for large samples of ringed galaxies. In this paper, we verify, using deep CCD surface photometry and Fabry-Perot interferometry, that the bar/ring misalignment of 60^deg^ seen in ESO 565-11 is intrinsic. We show that ESO 565-11 has two important nonaxisymmetric components: the primary bar, and a luminous oval distortion which contains a greater proportion of the total luminosity. The primary bar is of the "ansae" type, showing bright enhancements at the ends. The inner pseudoring is a minor contribution to the total light at the rim of the oval distortion. Thus, ESO 565-11 can also be characterized as a misaligned bar/oval galaxy. There is a very faint outer pseudoring beyond the oval distortion. In the center of the galaxy, a starburst nuclear ring of collosal physical size dominates the morphology. The ring is about 3.5 times the average size of such features and is defined by ten giant and at least three lesser H II regions which contribute 77% of the total Hα luminosity of the galaxy. The position angle of the major axis of the ring changes by 23^deg^ in the direction of rotation from Hα to B to I, and in the latter filter is aligned nearly perpendicular to the bar in projection. The ring is also imbedded in a more extended disk of diffuse Hα emission. The inner pseudoring is defined by much fainter discrete H II regions.

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