Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21931103s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #311.03
Other
Scientific paper
We present an analysis of the environmental dependence of bars and bulges in disc galaxies, using a volume-limited catalogue of 16397 galaxies at z<0.06 from the Sloan Digital Sky Survey that have visual morphologies from the Galaxy Zoo 2 project. We confirm that the likelihood of having a bar or bulge in disc galaxies increases when the galaxies have redder optical colours and larger stellar masses, and observe a transition in the bar and bulge likelihoods, such that massive disc galaxies with high stellar mass surface densities, old stellar populations, and low star formation rates and gas masses are more likely to host bulges and bars. However, we find that bar and bulge likelihood are not monotonically correlated with each other. In addition, while most bulge-dominated disc galaxies are massive and on the 'red sequence' of the colour-magnitude diagram, a wider variety of optical colours is seen in galaxies that host bars.
We use two-point galaxy clustering methods to demonstrate statistically significant environmental correlations of both barred and bulged galaxies, from projected separations of 150 kpc/h to 3 Mpc/h. We demonstrate that a large fraction (30-90%) of the bar-environment correlation is explained by more massive dark matter haloes hosting redder disc galaxies which in turn are more likely to have bars. This is shown with two independent tests: (1) by shuffling the bar likelihood at a given colour; and (2) using an SDSS-like mock galaxy catalogue in which bar likelihoods are assigned based on the model galaxy colour. In contrast, the environmental dependence of stellar mass explains less of the bar-environment correlation. Finally, by analyzing the clustering measurements with halo occupation models, we argue that unbarred galaxies are dominated by central galaxies in low-mass haloes, while the satellite disc galaxies in more massive haloes are more likely to form bars.
Edmondson Edward M.
Hoyle Ben
Masters Karen L.
Nichol Robert C.
Skibba Ramin A.
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