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Constraining the LyC escape fraction from LEGUS star clusters with SIGNALS H ii region observations: a pilot study of NGC 628.

Authors :
Teh, Jia Wei
Grasha, Kathryn
Krumholz, Mark R
Battisti, Andrew J
Calzetti, Daniela
Rousseau-Nepton, Laurie
Rhea, Carter
Adamo, Angela
Kennicutt, Robert C
Grebel, Eva K
Cook, David O
Combes, Francoise
Messa, Matteo
Linden, Sean T
Klessen, Ralf S
Vilchez, José M
Fumagalli, Michele
McLeod, Anna
Smith, Linda J
Chemin, Laurent
Source :
Monthly Notices of the Royal Astronomical Society. Sep2023, Vol. 524 Issue 1, p1191-1210. 20p.
Publication Year :
2023

Abstract

The ionizing radiation of young and massive stars is a crucial form of stellar feedback. Most ionizing (Lyman-continuum; LyC, λ < 912Å) photons are absorbed close to the stars that produce them, forming compact H ii regions, but some escape into the wider galaxy. Quantifying the fraction of LyC photons that escape is an open problem. In this work, we present a seminovel method to estimate the escape fraction by combining broadband photometry of star clusters from the Legacy ExtraGalactic UV Survey (LEGUS) with H ii regions observed by the Star formation, Ionized gas, and Nebular Abundances Legacy Survey (SIGNALS) in the nearby spiral galaxy NGC 628. We first assess the completeness of the combined catalogue, and find that 49  per cent of H ii regions lack corresponding star clusters as a result of a difference in the sensitivities of the LEGUS and SIGNALS surveys. For H ii regions that do have matching clusters, we infer the escape fraction from the difference between the ionizing power required to produce the observed H ii luminosity and the predicted ionizing photon output of their host star clusters; the latter is computed using a combination of LEGUS photometric observations and a stochastic stellar population synthesis code slug (Stochastically Lighting Up Galaxies). Overall, we find an escape fraction of |${f}_{\textrm {esc}}= 0.09^{+0.06}_{-0.06}$| across our sample of 42 H ii regions; in particular, we find H ii regions with high f esc are predominantly regions with low |$\operatorname{H\alpha }$| -luminosity. We also report possible correlation between f esc and the emission lines |$\rm [O\, \rm {\small II}]/[N\, \rm {\small II}]$| and |$\rm [O\, \rm {\small II}]/H\beta$|⁠. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00358711
Volume :
524
Issue :
1
Database :
Academic Search Index
Journal :
Monthly Notices of the Royal Astronomical Society
Publication Type :
Academic Journal
Accession number :
166108159
Full Text :
https://doi.org/10.1093/mnras/stad1780