Abstract
An analysis of the NICMOS Deep Field shows that there is no evidence of a decline in the bar fraction beyond z~0.7, as previously claimed; both bandshifting and spatial resolution must be taken into account when evaluating the evolution of the bar fraction. Two main caveats of this study were a lack of a proper comparison sample at low redshifts and a larger number of galaxies at high redshifts. We address these caveats using two new studies. For a proper local sample, we have analyzed 134 spirals in the near-infrared using 2MASS (main results presented by Menendez-Delmestre in this volume) which serves as an ideal anchor for the low-redshift Universe. In addition to measuring the mean bar properties, we find that bar size is correlated with galaxy size and brightness, but the bar ellipticity is not correlated with these galaxy properties. The bar length is not correlated with the bar ellipticity. For larger high redshift samples we analyze the bar fraction from the 2-square degree COSMOS ACS survey. We find that the bar fraction at z~0.7 is ~50%, consistent with our earlier finding of no decline in bar fraction at high redshifts.
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Sheth, K. et al. (2004). Using Bars as Signposts of Galaxy Evolution at High and Low Redshifts. In: Block, D.L., Puerari, I., Freeman, K.C., Groess, R., Block, E.K. (eds) Penetrating Bars through Masks of Cosmic Dust. Astrophysics and Space Science Library, vol 319. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-2862-5_36
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DOI: https://doi.org/10.1007/978-1-4020-2862-5_36
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