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Yara Jaffe |
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"The Effect of the
Environment on the Tully-Fisher Relation" |
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We measure the relation between galaxy luminosity and disk maximum rotation velocity (the Tully-Fisher relation [TFR]) for a sample of 151 emission-line galaxies from the ESO Distant Cluster Survey. Our aim is to distinguish between the possible physical mechanisms that act on galaxies when they fall into clusters and provide observational constraints for theoretical models of galaxy formation. The sample spans a vast range of environments up to z < 1. We compare the TFR residuals of field and cluster galaxies for 'matched' samples in absolute B-band magnitude and redshift. Interestingly, we find the TFR residual distribution of both populations to behave similarly. This finding favors a scenario in which galaxies do not experience an initial enhancement of their star formation when they join a galaxy cluster, as it has been proposed in previous studies with smaller samples. Moreover, we looked at the morphologies of the galaxies in our sample and found a population of elliptical galaxies that show a clear rotation curve. This could be the progenitors of the similar objects found locally. |