Testing the Snickers TM Hypothesis: Is Every Peanut to be Found in a Galaxy Bar?

Details Testing the Snickers TM Hypothesis: Is Every Peanut to be Found in a Galaxy Bar? Testing the Snickers TM Hypothesis: Is Every Peanut to be Found in a Galaxy Bar?

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18510506m&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #105.06; Bulletin of the American Astronomical Society, Vol. 26, p.1493

Astronomy and Astrophysics

Astronomy

2

Scientific paper

It has been suggested that the peanut-shaped bulges seen in some edge-on disk galaxies are produced by central bars in these systems. Unfortunately, this association has proved difficult to establish observationally: peanut distortions in bulge isophotes are only measurable if a galaxy is viewed close to edge-on, whereas galactic bars can only be detected photometrically in more face-on systems. However, orbital motions in edge-on barred potentials produce a strong kinematic signature in the form of double-peaked line-of-sight velocity distributions with a characteristic ``figure-of-eight'' variation with radius. We have made spectroscopic observations of two edge-on galaxies with peanut-shaped bulges (NGC 5746 and NGC 5965), and they reveal exactly such line-of-sight velocity distributions in both their gaseous (emission line) and their stellar (absorption line) components. These data provide strong observational evidence that peanut-shaped bulges are a by-product of bar formation. This research has been supported by a PPARC Advanced Fellowship (MM) and a Hubble Fellowship (KK).

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