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Shape Evolution of Massive Early-type Galaxies: Confirmation of Increased Disk Prevalence at z > 1

  • Authors: Yu-Yen Chang, Arjen van der Wel, Hans-Walter Rix, Stijn Wuyts, Stefano Zibetti, Balasubramanian Ramkumar, and Bradford Holden

Chang et al. 2013 The Astrophysical Journal 762 83.

  • Provider: AAS Journals

Caption: Figure 9.

Axis-ratio histograms ( df/ dq proj) of early-type galaxies with all masses log( M/ M ) > 10.7 (our full sample) as a function of redshift in bottom three panels, always compared with the present-day sample from H12. The top panel shows cumulative histograms for all redshift bins as a function of projected axis ratio f(< q proj). Up to z = 0.8, as confirmed by the M-W statistical test (of which the probability is given that the samples are statistically the same), there is no significant redshift evolution in the projected axis-ratio distribution, consistent with the results from H12. At z > 1, we find that early-type galaxies are flatter than their present-day counterparts.

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