Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-03-01
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
v2 as accepted by MNRAS 7th October 2010. 10 pages, 7 figures (v1 is submitted version from Feb 8th 2010)
Scientific paper
We present first results from Galaxy Zoo 2, the second phase of the highly successful Galaxy Zoo project (www.galaxyzoo.org). Using a volume-limited sample of 13665 disk galaxies (0.01< z < 0.06 and M_r<-19.38), we study the fraction of galaxies with bars as a function of global galaxy properties like colour, luminosity and bulge prominence. Overall, 29.4+/-0.5% of galaxies in our sample have a bar, in excellent agreement with previous visually classified samples of galaxies (although this overall fraction is lower than measured by automated bar-finding methods). We see a clear increase in the bar fraction with redder (g-r) colours, decreased luminosity and in galaxies with more prominent bulges, to the extent that over half of the red, bulge-dominated, disk galaxies in our sample possess a bar. We see evidence for a colour bi-modality for our sample of disk galaxies, with a "red sequence" that is both bulge and bar-dominated, and a "blue cloud" which has little, or no, evidence for a (classical) bulge or bar. These results are consistent with similar trends for barred galaxies seen recently both locally and at higher redshift, and with early studies using the RC3. We discuss these results in the context of internal (secular) galaxy evolution scenarios and the possible links to the formation of bars and bulges in disk galaxies.
Bamford Steven
Edmondson Edward M.
Fortson Lucy
Hoyle Ben
Keel William C.
No associations
LandOfFree
Galaxy Zoo: Bars in Disk Galaxies 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 Galaxy Zoo: Bars in Disk Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galaxy Zoo: Bars in Disk Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-662707