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New clues on the extended HeII ionization in IZw18 from GTC/MEGARA and JWST/MIRI
A. Arroyo-Polonio, C. Kehrig, J. M. Vílchez +5
IZw18 is one of the lowest-metallicity star-forming galaxies known at z0, considered a unique local analogue of the first galaxies. The origin of its hard ionizing continuum,…
Chemical abundances in the nuclear region of nearby galaxies from the Palomar Survey
Borja Pérez-Díaz, Josefa Masegosa, Isabel Márquez +1
We estimate chemical abundances and ionization parameters in the nuclear region of a sample of 143 galaxies from the Palomar Spectroscopic Survey, composed by Star-Forming Galaxies…
Photon leaking or very hard ionizing radiation? Unveiling the nature of heII-emitters using the softness diagram
E. Pérez-Montero, C. Kehrig, J. M. Vílchez +3
Star-forming galaxies with nebular HeII emission contain very energetic ionizing sources of radiation, which can be considered as analogs to the major contributors of the reionizat…