Bibcode
Barrera-Ballesteros, J. K.; Sánchez, S. F.; García-Lorenzo, B.; Falcón-Barroso, J.; Mast, D.; García-Benito, R.; Husemann, B.; van de Ven, G.; Iglesias-Páramo, J.; Rosales-Ortega, F. F.; Pérez-Torres, M. A.; Márquez, I.; Kehrig, C.; Marino, R. A.; Vilchez, J. M.; Galbany, L.; López-Sánchez, Á. R.; Walcher, C. J.; Califa Collaboration
Bibliographical reference
Astronomy and Astrophysics, Volume 579, id.A45, 9 pp.
Advertised on:
7
2015
Journal
Citations
67
Refereed citations
62
Description
We use optical integral-field spectroscopic (IFS) data from 103 nearby
galaxies at different stages of the merging event, from close pairs to
merger remnants provided by the CALIFA survey, to study the impact of
the interaction in the specific star formation and oxygen abundance on
different galactic scales. To disentangle the effect of the interaction
and merger from internal processes, we compared our results with a
control sample of 80 non-interacting galaxies. We confirm the moderate
enhancement (×2-3 times) of specific star formation for
interacting galaxies in central regions as reported by previous studies;
however, the specific star formation is comparable when observed in
extended regions. We find that control and interacting star-forming
galaxies have similar oxygen abundances in their central regions, when
normalized to their stellar masses. Oxygen abundances of these
interacting galaxies seem to decrease compared to the control objects at
the large aperture sizes measured in effective radius. Although the
enhancement in central star formation and lower metallicities for
interacting galaxies have been attributed to tidally induced inflows,
our results suggest that other processes such as stellar feedback can
contribute to the metal enrichment in interacting galaxies.
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