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dc.contributor.authorKumari, Nen
dc.contributor.authorJames, BLen
dc.contributor.authorIrwin, Mikeen
dc.contributor.authorAmorin Barbieri, Ricardoen
dc.contributor.authorPérez-Montero, Een
dc.date.accessioned2018-06-04T08:46:03Z
dc.date.available2018-06-04T08:46:03Z
dc.date.issued2018-05-21en
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/276482
dc.description.abstractWe use integral field spectroscopic (IFS) observations from Gemini North Multi-Object Spectrograph (GMOS-N) of a group of four H II regions and the surrounding gas in the central region of the blue compact dwarf (BCD) galaxy NGC 4670. At spatial scales of $\sim$ 9 pc, we map the spatial distribution of a variety of physical properties of the ionised gas: internal dust attenuation, kinematics, stellar age, star-formation rate, emission line ratios and chemical abundances. The region of study is found to be photoionised. Using the robust direct T$_e$-method, we estimate metallicity, nitrogen-to-oxygen ratio and helium abundance of the four H II regions. The same parameters are also mapped for the entire region using the HII-CHI-mistry code. We find that log(N/O) is increased in the region where the Wolf-Rayet bump is detected.The region coincides with the continuum region, around which we detect a slight increase in He abundance. We estimate the number of WC4, WN2-4 and WN7-9 stars from the integrated spectrum of WR bump region. We study the relation between log(N/O) and 12 + log(O/H) using the spatially-resolved data of the FOV as well as the integrated data of the H II regions from ten BCDs. We find an unexpected negative trend between N/O and metallicity. Several scenarios are explored to explain this trend, including nitrogen enrichment, and variations in star formation efficiency via chemical evolution models.
dc.publisherOxford University Press
dc.titleO/H-N/O: The curious case of NGC 4670en
dc.typeArticle
prism.endingPage3815
prism.issueIdentifier3en
prism.publicationDate2018en
prism.publicationNameMonthly Notices of the Royal Astronomical Societyen
prism.startingPage3793
prism.volume476en
dc.identifier.doi10.17863/CAM.23780
dcterms.dateAccepted2018-02-13en
rioxxterms.versionofrecord10.1093/MNRAS/STY402en
rioxxterms.versionAM*
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-05-21en
dc.contributor.orcidIrwin, Mike [0000-0002-2191-9038]
dc.contributor.orcidAmorin Barbieri, Ricardo [0000-0001-5758-1000]
dc.identifier.eissn1365-2966
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idECH2020 EUROPEAN RESEARCH COUNCIL (ERC) (695671)
rioxxterms.freetoread.startdate2019-02-15


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