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A Morphological and Statistical Analysis of Ansae in Barred Galaxie | | I. Martinez-Valpuesta
; J. H. Knapen
; R. Buta
; | | Date: |
6 Sep 2007 | | Abstract: | Many barred galaxies show a set of symmetric enhancements at the ends of the
stellar bar, called {it ansae}, or the ’’handles’’ of the bar. The ansa bars
have been in the literature for some decades, but their origin has still not
been specifically addressed, although, they could be related to the growth
process of bars. But even though ansae have been known for a long time, no
statistical analysis of their relative frequency of occurrence has been
performed yet. Similarly, there has been no study of the varieties in
morphology of ansae even though significant morphological variations are known
to characterise the features. In this paper, we make a quantitative analysis of
the occurrence of ansae in barred galaxies, making use of {it The de
Vaucouleurs Atlas of Galaxies} by Buta and coworkers. We find that $sim 40%$
of SB0’s show ansae in their bars, thus confirming that ansae are common
features in barred lenticulars. The ansa frequency decreases dramatically with
later types, and hardly any ansae are found in galaxies of type Sb or later.
The bars in galaxies with ansae are stronger in the median than those in
galaxies without ansae, but the presence of inner and outer rings is not
related to the presence of ansae. Implications of these results and theories
for the possible origin of ansae are discussed briefly. | | Source: | arXiv, 0709.0814 | | Services: | Forum | Review | PDF | Favorites | |
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