30 citations · 107 across the 8 of their papers we have counts for
8 papers
HII-CHI-mistry for active galactic nuclei: optical sulphur abundances without empirical ionisation correction factors
E. Pérez-Montero, O. L. Dors, I. A. Zinchenko +2
> The determination of sulphur abundances in active galactic nuclei (AGN) is uncertain because ionisation correction factors (ICFs) are commonly calibrated for HII regions. We exte…
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,…
Unraveling the Kinematics of IZw18: A Detailed Study of Ionized Gas with MEGARA/GTC
Antonio Arroyo-Polonio, Carolina Kehrig, Jorge Iglesias Paramo +6
This study delves into the intricate kinematic behavior of ionized gas within IZw18, a galaxy known for its remarkably low metallicity and proximity. Leveraging data from MEGARA/GT…
The softness diagram for MaNGA star-forming regions: diffuse ionized gas contamination or local HOLMES predominance?
Enrique Pérez-Montero, Igor Zinchenko, José M. Vílchez +3
We explore the so-called softness diagram -- whose main function is to provide the hardness of the ionizing radiation in star-forming regions -- in order to check whether hot and o…
SOFIA observations of far-IR fine-structure lines in galaxies to measure metallicity
Luigi Spinoglio, Juan Antonio Fernandez-Ontiveros, Matthew A. Malkan +8
We present new and archival SOFIA FIFI-LS far-IR spectroscopic observations of 25 local galaxies of either the [OIII]52um and/or the [NIII]57um lines. Including other 31 galaxies f…
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…
Aperture effects on the oxygen abundance determinations from CALIFA data
J. Iglesias-Páramo, J. M. Vílchez, F. F. Rosales-Ortega +23
This paper aims at providing aperture corrections for emission lines in a sample of spiral galaxies from the Calar Alto Legacy Integral Field Area Survey (CALIFA) database. In part…