Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9709w&link_type=abstract
American Astronomical Society, AAS Meeting #211, #97.09; Bulletin of the American Astronomical Society, Vol. 39, p.905
Astronomy and Astrophysics
Astronomy
Scientific paper
Structural decomposition of galaxies into bulge, disk, and bar components is important to address a number of scientific problems. Measuring bulge, disk, and bar structural parameters will set constraints on the violent and secular processes of galaxy assembly and recurrent bar formation and dissolution models. It can also help to quantify the fraction and properties of bulgeless galaxies (those systems having no bulge or only a relatively insignificant disky-pseudobulges), which defy galaxy formation paradigms requiring almost every disk galaxy to have a classical bulge at its core. We demonstrate three-component bulge+disk+bar decomposition of NIR images for a sample of 200+ galaxies, with Hubble types S0 to Sm, from the Ohio State University Bright Spiral Galaxy Survey (OSUBSGS) and the UKIRT Infrared Deep Sky Survey (UKIDSS). Unlike most early studies, which attempt two-component bulge+disk decomposition, we perform three-component bulge+disk+bar decomposition with GALFIT. We show that it is important to include the bar component, as this can lower the bulge fractional luminosity ratio (B/T), often by a factor of two or more, and effectively change the Hubble type of a galaxy from early to late. We investigate how the structure of bulges and B/T vary across the Hubble sequence for barred and unbarred galaxies. We also identify the fraction of bulgeless galaxies in our sample and characterize their properties.
Barazza Fabio
Jogee Sharda
Weinzirl Tim
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