Our paper VLT/XShooter spectroscopy of Lyman Break Analogs: direct method O/H abundances and nitrogen enhancements (Loaiza-Agudelo, Overzier & Heckman) was published in The Astrophysical Journal. This paper represents the thesis work of Maryory Loaiza Agudelo, who obtained her PhD at the Observatório Nacional in June, 2019.
The above figure presents the main conclusion of the paper. It shows that the interstellar medium in a class of nearby starburst galaxies known as “Lyman break analogs” has lower oxygen-over-hydrogen (O/H) ratios both expected for their stellar mass and expected based on their nitrogen-over-oxygen (N/O) ratios. Both these facts are most easily explained if these galaxies recently experienced a large influx of relatively metal poor gas (rich in hydrogen but poor in oxygen and nitrogen). This finding agrees well with other facts about these galaxies, and may explain why they are able to produce high rates of star formation.