SDSS IV MaNGA: Metallicity and ionisation parameter in local star-forming galaxies from Bayesian fitting to photoionisation models
dc.contributor.author | Mingozzi, M | |
dc.contributor.author | Belfiore, F | |
dc.contributor.author | Cresci, G | |
dc.contributor.author | Bundy, K | |
dc.contributor.author | Bershady, M | |
dc.contributor.author | Bizyaev, D | |
dc.contributor.author | Blanc, G | |
dc.contributor.author | Boquien, M | |
dc.contributor.author | Drory, N | |
dc.contributor.author | Fu, H | |
dc.contributor.author | Maiolino, Roberto | |
dc.contributor.author | Riffel, R | |
dc.contributor.author | Schaefer, A | |
dc.contributor.author | Storchi-Bergmann, T | |
dc.contributor.author | Telles, E | |
dc.contributor.author | Tremonti, C | |
dc.contributor.author | Zakamska, N | |
dc.contributor.author | Zhang, K | |
dc.date.accessioned | 2020-04-01T14:36:03Z | |
dc.date.available | 2020-04-01T14:36:03Z | |
dc.date.issued | 2020-04-13 | |
dc.identifier.issn | 0004-6361 | |
dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/303995 | |
dc.description.abstract | We measured gas-phase metallicity, ionisation parameter and dust extinction for 1795 representative local star-forming galaxies using integral field spectroscopy from the SDSS-IV MaNGA survey. We self-consistently derive these quantities by comparing observed line fluxes with photoionisation models using a Bayesian framework. We also present the first comprehensive study of the [SIII]$\lambda\lambda$9069,9532 nebular lines, which have long been predicted to be ideal tracers of the ionisation parameter. Unfortunately, we find that current photoionisation models substantially over-predict [SIII] lines intensity, while broadly reproducing other observed optical line ratios. We discuss how to nonetheless make use of the information provided by [SIII] lines by setting a prior on the ionisation parameter. Following this approach, we derive spatially-resolved maps and radial profiles of metallicity and ionisation parameter. The metallicity radial profiles are comparable with previous works, with metallicity declining toward the outer parts and a flattening in the central regions, in agreement with infall models of galaxy formation, that predict that spiral discs build up through accretion of material, which leads to an inside-out growth. On the other hand, ionisation parameter radial profiles are flat for low-mass galaxies, while their slope becomes positive as galaxy mass increases. However, the ionisation parameter maps we obtain are clumpy, especially for low-mass galaxies. Ionisation parameter is tightly correlated with the H$\alpha$ equivalent width [EW(H$\alpha$)], following a nearly universal relation, which we attribute to the change of the spectral shape of ionising sources due to ageing of HII regions. We derive a positive correlation between ionisation parameter and metallicity at fixed EW(H$\alpha$), in disagreement with previous theoretical works expecting an anti-correlation. | |
dc.description.sponsorship | STFC and ERC | |
dc.publisher | EDP Sciences | |
dc.rights | All rights reserved | |
dc.title | SDSS IV MaNGA: Metallicity and ionisation parameter in local star-forming galaxies from Bayesian fitting to photoionisation models | |
dc.type | Article | |
prism.publicationDate | 2020 | |
prism.publicationName | Astronomy and Astrophysics | |
prism.volume | 636 | |
dc.identifier.doi | 10.17863/CAM.51076 | |
dcterms.dateAccepted | 2020-02-13 | |
rioxxterms.versionofrecord | 10.1051/0004-6361/201937203 | |
rioxxterms.version | VoR | |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
rioxxterms.licenseref.startdate | 2020-04-01 | |
dc.contributor.orcid | Maiolino, Roberto [0000-0002-4985-3819] | |
dc.identifier.eissn | 1432-0746 | |
rioxxterms.type | Journal Article/Review | |
pubs.funder-project-id | European Research Council (695671) | |
pubs.funder-project-id | Science and Technology Facilities Council (ST/M001172/1) | |
cam.orpheus.success | Mon Jul 20 07:59:07 BST 2020 - The item has an open VoR version. | |
cam.orpheus.counter | 4 | |
rioxxterms.freetoread.startdate | 2100-01-01 |
Files in this item
This item appears in the following Collection(s)
-
Cambridge University Research Outputs
Research outputs of the University of Cambridge