Galaxy And Mass Assembly (GAMA): the interplay between galaxy mass, SFR and heavy element abundance in paired galaxy sets

Abstract

We study the star formation rate (SFR), stellar mass ($M_{\star }$) and the gas metallicity (Z) for 4,636 galaxy pairs using the Galaxy And Mass Assembly (GAMA) survey. Our galaxy pairs lie in a redshift range of 0 $<$ $z$ $<$ 0.35, mass range of 7.5 $<$ log( M${}_{\star }$/ M${}_{\odot }$) $<$ 11.5 and $\Delta V$ $<$ 1000 km s${}^{-1}$. We explore variations in SFR and Z from three point of views: multiplicity, pair separation and dynamics. We define multiplicity as the number of galaxies paired with a single galaxy, and analyzed for the first time variations in SFR and Z for both, single pairs and pairs with higher multiplicity. For the latter, we find SFR enhancements from 0.025-0.15 dex, that would shift the M-SFR relation of single pairs by 27$\%$ to higher SFRs. The effect of Z on the other hand, is of only 4$\%$. We analyze the most and least massive galaxy of major/minor pairs as a function of the pair separation. We define major pairs those with mass ratios of 0.5 $<$ $M_1$/$M_2$ $<$ 2, while pairs with more discrepant mass ratios are classified as minor pairs. We find SFR enhancements of up to 2 and 4 times with respect to their control sample, for major and minor pairs. For the case of Z, we find decrements of up to 0.08 dex for the closest pairs. When we focus on dynamics, Z enhancements are found for minor pairs with high velocity dispersion $({\sigma }_p>250\mathrm{km}{\mathrm{s}}^{-1})$ and high multiplicity.

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• The Fornax3D project: The environmental impact on gas metallicity gradients in Fornax cluster galaxies
• The Subtle Effects of Mergers on Star Formation in Nearby Galaxies
• The bimodality in the mass-metallicity relation in SDSS-MaNGA galaxy pairs
• The variation of the gas content of galaxy groups and pairs compared to isolated galaxies
• Galaxy And Mass Assembly (GAMA): The environmental impact on SFR and metallicity in galaxy groups
• The PAU Survey: Close galaxy pairs identification and analysis
• Star Formation in CALIFA survey perturbed galaxies. II. Star Formation Histories and Oxygen Abundances