3D intrinsic shapes of quiescent galaxies in observations and simulations
| Autor: | Junkai Zhang, Stijn Wuyts, Callum Witten, Charlotte R Avery, Lei Hao, Raman Sharma, Juntai Shen, Jun Toshikawa, Carolin Villforth |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
interactions [galaxies]
FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) structure [galaxies] disc [galaxies] elliptical and lenticular cD [galaxies] evolution [galaxies] Astrophysics::Galaxy Astrophysics general [galaxies] |
| Zdroj: | Zhang, J, Wuyts, S, Witten, C, Avery, C R, Hao, L, Sharma, R, Shen, J, Toshikawa, J & Villforth, C 2022, ' 3D intrinsic shapes of quiescent galaxies in observations and simulations ', Monthly Notices of the Royal Astronomical Society, vol. 513, no. 4, pp. 4814-4832 . https://doi.org/10.1093/mnras/stac1083 |
| DOI: | 10.48550/arxiv.2204.10867 |
| Popis: | We study the intrinsic 3D shapes of quiescent galaxies over the last half of cosmic history based on their axial ratio distribution. To this end, we construct a sample of unprecedented size, exploiting multi-wavelength $u$-to-$K_s$ photometry from the deep wide area surveys KiDS+VIKING paired with high-quality $i$-band imaging from HSC-SSP. Dependencies of the shapes on mass, redshift, photometric bulge prominence and environment are considered. For comparison, the intrinsic shapes of quenched galaxies in the IllustrisTNG simulations are analyzed and contrasted to their formation history. We find that over the full $0 10^{11}\ M_{\odot}$, with the effect being most pronounced at lower redshifts. In TNG, the most massive galaxies feature the highest ex-situ stellar mass fractions, pointing to violent relaxation via mergers as the mechanism responsible for their 3D shape transformation. Larger differences between observed and simulated shapes are found at low to intermediate masses. At any mass, the most spheroidal quiescent galaxies in TNG feature the highest bulge mass fractions, and conversely observed quiescent galaxies with the highest bulge-to-total ratios are found to be intrinsically the roundest. Finally, we detect an environmental influence on galaxy shape, at least at the highest masses, such that at fixed mass and redshift quiescent galaxies tend to be rounder in denser environments. Comment: Accepted by MNRAS. 18 pages, 11 figures, 2 tables |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|