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Sizes of Passively Evolving Galaxies at z ~2 in CLASH

  • Lulu Fan (a1) (a2), Yang Chen (a1) (a3), Xinzhong Er (a4), Lin Lin (a1) and Jinrong Li (a1)...

Abstract

We select ten passively evolving and massive galaxies at redshift z ~ 2 from the Cluster Lensing And Supernova survey with Hubble (CLASH). We derive the stellar properties of these galaxies using the multiwavelength HST WFC3 and ACS data, together with Spitzer IRAC observations. We also analyze the optical rest-frame morphology of these high redshift objects by using the GALFIT package (Peng et al. 2002). The observed near-IR images, obtained with the HST/WFC3 camera with high spatial resolution and amplified by the foreground clusters, provide us with a good chance to study the structures of such systems. Six out of ten galaxies have on average a four times smaller effective radius, in agreement with previous works at redshift z ~ 2.

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References

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Fan, L., Lapi, A., De Zotti, G., & Danese, L. 2008, ApJ (Letters), 689, L101
Fan, L., Lapi, A., Bressan, A., et al. 2010, ApJ, 718, 1460
Naab, T., Johansson, P. H., & Ostriker, J. P. 2009, ApJ (Letters), 699, L178
Peng, C. Y., Ho, L. C., Impey, C. D., & Rix, H.-W. 2002, AJ, 124, 266
Postman, M., Coe, D., Benitez, N., et al. 2012, ApJS, 199, 25
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