Hardness of ionizing radiation fields in MaNGA star-forming galaxies

DOI: 
10.1093/mnras/stab2495
Publication date: 
24/11/2021
Main author: 
Kumari, Nimisha
IAA authors: 
Pérez-Montero, Enrique;Vílchez, Jose
Authors: 
Kumari, Nimisha;Amorín, Ricardo;Pérez-Montero, Enrique;Vílchez, Jose;Maiolino, Roberto
Journal: 
Monthly Notices of the Royal Astronomical Society
Publication type: 
Article
Volume: 
508
Pages: 
1084
Abstract: 
We investigate radiation hardness within a representative sample of 67 nearby (0.02 ≲ z ≲ 0.06) star-forming (SF) galaxies using the integral field spectroscopic data from the MaNGA survey. The softness parameter η = $\frac{O^{+}/O^{2+}}{S^{+}/S^{2+}}$ is sensitive to the spectral energy distribution of the ionizing radiation. We study η via the observable quantity η' (${=}\frac{[\text{O}\,{\small II}]/[\text{O}\,{\small III}]}{[\text{S}\,{\small II}][\text{S}\,{\small III}]}$). We analyze the relation between radiation hardness (traced by η and η') and diagnostics sensitive to gas-phase metallicity, electron temperature, density, ionization parameter, effective temperature, and age of ionizing populations. It is evident that low metallicity is accompanied by low log η', i.e. hard radiation field. No direct relation is found between radiation hardness and other nebular parameters though such relations cannot be ruled out. We provide empirical relations between log $\rm \eta$ and strong emission line ratios N<SUB>2</SUB>, O<SUB>3</SUB>N<SUB>2</SUB>, and Ar<SUB>3</SUB>O<SUB>3</SUB>, which will allow future studies of radiation hardness in SF galaxies where weak auroral lines are undetected. We compare the variation of [O III]/[O II] and [S III]/[S II] for MaNGA data with SF galaxies and H II regions within spiral galaxies from literature and find that the similarity and differences between different data set are mainly due to the metallicity. We find that predictions from photoionization models considering young and evolved stellar populations as ionizing sources in good agreement with the MaNGA data. This comparison also suggests that hard radiation fields from hot and old low-mass stars within or around SF regions might significantly contribute to the observed η values.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2021MNRAS.508.1084K/abstract
ADS Bibcode: 
2021MNRAS.508.1084K
Keywords: 
galaxies: active;galaxies: ISM;Astrophysics - Astrophysics of Galaxies