Peanut-shaped bulges in face-on disk galaxies.

Méndez-Abreu, J.; Corsini, E. M.; Debattista, V. P.; De Rijcke, S.; Aguerri, J. A. L.; Pizzella, A.
Bibliographical reference

Memorie della Societa Astronomica Italiana Supplement, v.18, p.75 (2011)

Advertised on:
2011
Number of authors
6
IAC number of authors
2
Citations
0
Refereed citations
0
Description
We present high resolution absorption-line spectroscopy of 3 face-on galaxies, NGC 98, NGC 600, and NGC 1703 with the aim of searching for box/peanut (B/P)-shaped bulges. These observations test and confirm the prediction of citet{deb_etal_05} that face-on B/P-shaped bulges can be recognized by a double minimum in the profile of the fourth-order Gauss-Hermite moment h_4. In NGC 1703, which is an unbarred control galaxy, we found no evidence of a B/P bulge. In NGC 98, a clear double minimum in h_4 is present along the major axis of the bar and before the end of the bar, as predicted. In contrast, in NGC 600, which is also a barred galaxy but lacks a substantial bulge, we do not find a significant B/P shape.