The Remarkable Central Structure of the Barred Galaxy NGC 1415

Details The Remarkable Central Structure of the Barred Galaxy NGC 1415 The Remarkable Central Structure of the Barred Galaxy NGC 1415

1999-09-23

arxiv.org/abs/astro-ph/9909406v1

Astronomy and Astrophysics

Astrophysics

19 pages, 29 figures. To be published in February 2000, ApJ, 529

Scientific paper

10.1086/308316

A remarkable structure is observed in the innermost regions of the barred galaxy NGC 1415 : a small stellar bar, bright circumnuclear ionized gas seen in Halpha, two bright ionized gas sources, seen in Halpha, just beyond the ends of the small bar and a boxy distribution of optical continuum. We have developed a mass distribution model consisting in disk, a bulge, and a bar to approximate t he observed central morphology and its surface brightness. In order to reproduce the observed optical brightness distribution a two-component bar was used, with one component to model the elongated isophotes of the bar and the second component to model the boxy-shaped isophotes. We interpret the circumnuclear ionized gas as forming a circumnuclear ring and the two bright sources as a nuclear and/or circumnuclear outflow slightly out of the plane of the disk.

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