Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-01-15
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
15 pages, 13 figures. Accepted for publication in A&A
Scientific paper
10.1051/0004-6361:200810931
(Abridge) Bars are very common in the centre of the disc galaxies, and they drive the evolution of their structure. A volume-limited sample of 2106 disc galaxies extracted from the Sloan Digital Sky Survey Data Release 5 was studied to derive the bar fraction, length, and strength as a function of the morphology, size, local galaxy density, light concentration, and colour of the host galaxy. The bars were detected using the ellipse fitting method and Fourier analysis method. The ellipse fitting method was found to be more efficient in detecting bars in spiral galaxies. The fraction of barred galaxies turned out to be 45%. A bar was found in 29% of the lenticular galaxies, in 55% and 54% of the early- and late-type spirals, respectively. The bar length (normalised by the galaxy size) of late-type spirals is shorter than in early-type or lenticular ones. A correlation between the bar length and galaxy size was found with longer bars hosted by larger galaxies. The bars of the lenticular galaxies are weaker than those in spirals. Moreover, the unimodal distribution of the bar strength found for all the galaxy types argues against a quick transition between the barred and unbarred statues. There is no difference between the local galaxy density of barred and unbarred galaxies. Besides, neither the length nor strength of the bars are correlated with the local density of the galaxy neighbourhoods. In contrast, a statistical significant difference between the central light concentration and colour of barred and unbarred galaxies was found. Bars are mostly located in less concentrated and bluer galaxies. These results indicate that the properties of bars are strongly related to those of their host galaxies, but do not depend on the local environment.
Aguerri Alfonso J. L.
Corsini Enrico Maria
Mendez-Abreu Jairo
No associations
LandOfFree
The population of barred galaxies in the local universe I. Detection and characterisation of bars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The population of barred galaxies in the local universe I. Detection and characterisation of bars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The population of barred galaxies in the local universe I. Detection and characterisation of bars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-126681