Star Formation in CALIFA survey perturbed galaxies. II. Star Formation Histories and Oxygen Abundances

Author:

Morales-Vargas A1,Torres-Papaqui J P1,Rosales-Ortega F F2,Chow-Martínez M3,Trejo-Alonso J J4,Ortega-Minakata R A5,Robleto-Orús A C1,Romero-Cruz F J6,Neri-Larios D M7

Affiliation:

1. Departamento de Astronomía, Universidad de Guanajuato, Apartado Postal 144, Guanajuato 36000, Mexico

2. Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis Enrique Erro 1, Tonantzintla 72840, Mexico

3. Instituto de Geología y Geofísica, Universidad Nacional Autónoma de Nicaragua, Rotonda UniversitariaRigoberto López Pérez 150 metros al Este, Managua 663, Nicaragua

4. Facultad de Ingeniería, Universidad Autónoma de Querétaro, Cerro de las Campanas s/n, Centro Universitario,Santiago de Querétaro 76010, Mexico

5. Instituto de Radioastronomía y Astrofísica (IRyA), UNAM, Apartado Postal 72-3, Morelia, Michoacán 58089, Mexico

6. Instituto Tecnológico Superior de Guanajuato, Guanajuato 36262, Mexico

7. School of Physics, The University of Melbourne, Parkville, VIC. 3010, Australia

Abstract

Abstract Galaxy evolution is generally affected by tidal interactions. Firstly, in this series, we reported several effects which suggest that tidal interactions contribute to regulating star formation (SF). To confirm that so, 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 use 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 that so. 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.

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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