Star formation in CALIFA survey perturbed galaxies – II. Star-formation histories and oxygen abundances
Abstract
Galaxy evolution is generally affected by tidal interactions. First, in this series, we reported several effects that suggest that tidal interactions contribute to the regulation of star formation (SF). To confirm this, we now compare stellar mass assembly histories and SF look-back time annular profiles between CALIFA survey tidally and non-tidally perturbed galaxies. We pair their respective star-forming regions at the closest stellar mass surface densities to reduce the influence of stellar mass. The assembly histories and annular profiles show statistically significant differences so that higher star-formation rates characterize regions in tidally perturbed galaxies. These regions underwent a more intense (re)activation of SF in the last 1 Gyr. Varying shapes of the annular profiles also reflect fluctuations between suppression and (re)activation of SF. Since gas-phase abundances used to be lower in more actively than in less actively star-forming galaxies, we further explore the plausible presence of metal-poor gas inflows able to dilute such abundances. The resolved relations of oxygen (O) abundance with stellar mass density and with total gas fraction show slightly lower O abundances for regions in tidally perturbed galaxies. The single distributions of O abundances statistically validate this. Moreover, from a metallicity model based on stellar feedback, the mass rate differentials (inflows−outflows) show statistically valid higher values for regions in tidally perturbed galaxies. These differentials, and the metal fractions from the population synthesis, suggest dominant gas inflows in these galaxies. This dominance and the differences in SF through time confirm the previously reported effects of tidal interactions on SF.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 21, 2021
- Source ID
- 10.1093/mnras/stab2698
Entities
People
- A. C. Robleto-Orús
- A. Morales-Vargas
- Califa Survey Collaboration
- D. M. Neri-Larios
- F. F. Rosales-Ortega
- F. J. Romero-Cruz
- J. J. Trejo-Alonso
- J. P. Torres-Papaqui
- M. Chow-Martínez
- R. A. Ortega-Minakata
Organizations
- Alfred P. Sloan Foundation
- American Museum of Natural History
- Autonomous University of Queretaro
- Case Western Reserve University
- Chinese Academy of Sciences
- Coordenação de Aperfeicoamento de Pessoal de Nível Superior
- Drexel University
- Higher Education Funding Council for England
- Institute for Advanced Study
- Johns Hopkins University
- Los Alamos National Laboratory
- Maritime and Port Authority of Singapore
- National Aeronautics and Space Administration
- National Autonomous University of Mexico
- National Council for Scientific and Technological Development
- National Institute of Astrophysics, Optics and Electronics
- National Science Foundation
- New Mexico State University
- Ohio State University
- Princeton University
- São Paulo Research Foundation
- United States Department of Energy
- United States Naval Observatory
- Universidad de Guanajuato
- University of Basel
- University of Cambridge
- University of Chicago
- University of Melbourne
- University of Pittsburgh
- University of Portsmouth
- University of Washington