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Title: Different Formation Scenarios for Counterrotating Stellar Disks in Nearby Galaxies

Journal Article · · The Astrophysical Journal. Letters
 [1];  [2];  [3];  [2]; ORCiD logo [4]; ORCiD logo [5];  [5];  [6]; ORCiD logo [7]; ORCiD logo [8]
  1. Nanjing Univ. (China); Nanjing Normal University, Nanjing (China)
  2. Nanjing Univ. (China)
  3. Nanjing Univ. (China); Univ. of California, Santa Cruz, CA (United States)
  4. Apache Point Observatory and New Mexico State Univ., Sunspot, NM (United States); Moscow State Univ., Moscow (Russian Federation)
  5. Chinese Academy of Sciences (CAS), Shanghai (China)
  6. New Mexico State Univ., Las Cruces, NM (United States)
  7. Univ. of Utah, Salt Lake City, UT (United States)
  8. Universidad Bernardo O’Higgins, Santiago (Chile)
+ Show Author Affiliations

Using the integral field unit data from the Mapping Nearby Galaxies at Apache Point Observatory survey, we select a sample of 101 galaxies with counterrotating stellar disks and regularly rotating ionized gas disks. 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 the blue cloud, green valley, and red sequence populations. We suggest different formation scenarios for counterrotating stellar disks; the key factors in the formation of counterrotating stellar disks include (1) the abundance of preexisting gas in the progenitor and (2) the efficiency in angular momentum consumption.

Research Organization:
US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)
Sponsoring Organization:
China Manned Space Project; National Key R&D Program of China; National Natural Science Foundation of China; USDOE Office of Science (SC)
OSTI ID:
1983321
Journal Information:
The Astrophysical Journal. Letters, Journal Name: The Astrophysical Journal. Letters Journal Issue: 2 Vol. 926; ISSN 2041-8205
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Astronomy & Astrophysics
Galaxy kinematics
Star formation