PPAK Integral Field Spectroscopy survey of the Orion Nebula: Data Release

Aims. We present a low-resolution spectroscopic survey of the Ori on nebula. The data are released for public use. We show the po ssible applications of this dataset analyzing some of the mai n properties of the nebula. Methods. We perform an integral field spectroscopy mosaic of an area of ∼5×6 centered on the Trapezium region of the nebula, including the ionization front to the south-east. Analysis of the line fluxes and line ratios of both the individual and in tegrated spectra allowed us to determine the main characteristics of the ioni zation throughtout the nebula. Results. The final dataset comprises 8182 individual spectra, sample d in a circular area of ∼2.7 diameter. The data can be downloaded as a single row-stacked spectra fitsfile plus a positio n table or as an interpolated datacube with a final sampling of 1.5/pixel. The integrated spectrum across the field-of-view was used to obtain the main integrated properties of the nebula, includ ing the electron density and temperature, the dust extinction, the H α integrated flux (after correcting for dust reddening), and t he main diagnostic line ratios. The individual spectra were used to obtain line int nsity maps of the di fferent detected lines. These maps were used to study the distribution of the ionized hydrogen, the dust ext inction, the electron density and temperature, and the heli um and oxygen abundance. All of them show a considerable degree of structu re as already shown in previous studies. In particular, ther e is a tight relation between the helium and oxygen abundances and the io nization structure that cannot be explained by case B recomb ination theory. Simple arguments like partial ionization and dust m ixed with the emitting gas may explain these relations. Howe ver a more detailed modeling is required, for which we provide the data se .