Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19
Min Bao
Yanmei Chen
Pengpei Zhu
Yong Shi
Dmitry Bizyaev
Ling Zhu
Meng Yang
Minje Beom
Joel R. Brownstein
Richard R. Lane
Abstract： 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.
Peer Review Status:
Awaiting Review
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