I Simposio de Postgrado 2023. Ingeniería, ciencias e innovación

I SIMPOSIO 2023 MEASURING THE EFFECT OF ELECTRON TEMPERATURE STRUCTURE ON CHEMICAL ABUNDANCES OF H II REGIONS USING THE LOCAL VOLUME MAPPER (LVM) DATA SIMULATOR Amrita Singh1*, Guillermo Blanc 1 , 2, Enrico Congui3 1 Departamento de Astronomia, Universidad de Chile. 2 Carnegie Institution for Science. 3 European Southern Observatory (ESO). *Email: amrita@uchile.cl ABSTRACT The chemical composition of the Interstellar medium (ISM) is a critical tracer of galaxy evolution.Themost common approaches to measure metallicities in nearby galaxies are direct methods. One of the main issues with the measurements are that the electron temperature (Te) is not uniform and is characterized by both large and small-scale spatial variations, resulting in an overestimation of the Te when averaging across the full nebulae. To understand it, we need to study close, resolved objects. The LVM survey is one of the main projects of SDSS-V, provides the most detailed view of the galaxy ISM for this work. However, to understand the capabilities of the instrument, possible diagnostics and regions to study this topic, I utilized the LVM data simulator to obtain mock observations of simulated nebulae. Using different Te- sensitive ratios, I recovered the large-scale Te profile of a nebulae for different brightness. The low-ionization species sensors like [NII], [SII], and [OII] trace the outskirts but fail to trace the internal Te structure, whereas the high-ionization species like [OIII] and [SIII] trace the inner Te gradient of the nebulae well.The chemical composition is also found to be sensitive to errors and fluctuations in Te, to 0.1 to 0.3 dex. Henceforth, to recover small-scale variations, I introduce fluctuations at a smaller scale to relevant line emissivities in the data cube. Combining these fluctuations with the true Te-sensitive lines’ emissivities data cube allows visualizing the impact of Te structure variations on integrated chemical abundances of the nebulae in 3D.