How barred is our nearby universe? A detailed NIR 2MASS study of the local bar population - Setting the stage for studies of galaxy evolution

Details How barred is our nearby universe? A detailed NIR 2MASS study of the local bar population - Setting the stage for studies of galaxy evolution How barred is our nearby universe? A detailed NIR 2MASS study of the local bar population - Setting the stage for studies of galaxy evolution

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.6102m&link_type=abstract

American Astronomical Society Meeting 205, #61.02; Bulletin of the American Astronomical Society, Vol. 36, p.1446

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Bars have a dramatic impact on the evolution of a galaxy. The gas inflow prompted by a bar changes the galaxy's chemical abundance gradient and induces nuclear star formation. It may fuel active galactic nuclei and form bulges, which may lead to the bar's own destruction. Yet the basic properties of bars and their relationship to their host galaxies is not well-known even in the local Universe. This information is a prerequisite for understanding the evolution of galaxy disks over time. The 2MASS dataset offers a unique opportunity to quantify structural properties of bars such as bar length and strength in the local Universe. Using 134 large galaxies from the 2MASS sample, we determine a firm lower limit to the bar fraction of 0.58 and including "candidate" bars, an overall bar fraction of 0.72. We measure a mean deprojected semi-major axis of 5.1 kpc, and a mean deprojected ellipticity of 0.45. We discuss these properties in the context of the host galaxy properties. Our study lays the groundwork for similar studies of galaxy disk evolution with redshift.

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