The evolution of galaxy shapes in CANDELS: from prolate to discy

• Published in: Monthly notices of the Royal Astronomical Society 2019-04, Vol.484 (4), p.5170-5191
• Main Authors: Zhang, Haowen, Primack, Joel R, Faber, S M, Koo, David C, Dekel, Avishai, Chen, Zhu, Ceverino, Daniel, Chang, Yu-Yen, Fang, Jerome J, Guo, Yicheng, Lin, Lin, Wel, Arjen van der
• Format: Article
• Language: English
• Subjects: ASTRONOMY AND ASTROPHYSICS; galaxies: evolution; galaxies: formation; galaxies: fundamental parameters
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1093/mnras/stz339

Abstract We model the projected b/a–log a distributions of CANDELS star-forming main-sequence galaxies, where a (b) is the half-light semimajor (semiminor) axis of the galaxy images measured by galfit. We find that smaller a galaxies are rounder at all stellar masses M* and redshifts, so we include a when analysing b/a distributions. Approximating intrinsic shapes of the galaxies as triaxial ellipsoids and assuming a multivariate normal distribution of galaxy size and two shape parameters, we construct their intrinsic shape and size distributions to obtain the fractions of elongated (prolate), discy (oblate), and spheroidal galaxies in each redshift and mass bin. We find that galaxies tend to be prolate at low M* and high redshifts, and discy at high M* and low redshifts, qualitatively consistent with van der Wel et al., implying that galaxies tend to evolve from prolate to discy. These results are consistent with the predictions from simulations that the transition from prolate to oblate is caused by a compaction event at a characteristic mass range, making the galaxy centre baryon dominated. We give probabilities of a galaxy’s being elongated, discy, or spheroidal as a function of its M*, redshift, and projected b/a and a, which can facilitate target selections of galaxies with specific shapes at high redshifts.