期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 484, 期 4, 页码 5170-5191出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz339
关键词
galaxies: evolution; galaxies: formation; galaxies: fundamental parameters
资金
- China Scholarship Council
- Fujian Fuguang Foundation
- US-Israel BSF [2014-273]
- GIF [I-1341-303.7/2016]
- NSF [AST-1405962, DIP STE1869/2-1 GE625/17-1]
- NASA through a grant from the Space Telescope Science Institute [HST-AR-15025, NAS5-26555, HST-GO-12060]
- ERC Advanced Grant, STARLIGHT: Formation of the First Stars [339177]
- [HST-AR-14578.001-A]
- [NSF-AST-1615730]
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 amultivariate 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.
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