Different Formation Scenarios of Counter-rotating Stellar Disks in Nearby Galaxies

Autor:	Bao, Min, Chen, Yanmei, Zhu, Pengpei, Shi, Yong, Bizyaev, Dmitry, Zhu, Ling, Yang, Meng, Beom, Minje, Brownstein, Joel R., Lane, Richard R.
Rok vydání:	2022
Předmět:	Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
DOI:	10.3847/2041-8213/ac52ad
Popis:	Using the integral field unit (IFU) data from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, we select a sample of 101 galaxies with counter-rotating stellar disks and regularly-rotating ionized gas disk. We classify the 101 galaxies into four types based on the features of their stellar velocity fields. The relative fractions and stellar population age radial gradients of the four types are different in blue cloud (BC), green valley (GV) and red sequence (RS) populations. We suggest different formation scenarios for the counter-rotating stellar disks, and the key factors in the formation of counter-rotating stellar disks include: (1) the abundance of pre-existing gas in progenitor, (2) the efficiency in angular momentum consumption. Comment: 7 pages, 4 figures, accepted for publication in ApJL
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2202.03848 Zobrazit plný text záznamu View this record from Arxiv