MEGARA-IFU detection of extended He II λ4686 nebular emission in the central region of NGC1569 and its ionization budget

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dc.contributor.authorGil de Paz, Armando
dc.contributor.authorGallego Maestro, Jesús
dc.contributor.authorCastillo Morales, África
dc.contributor.authorPascual Ramírez, Sergio
dc.date.accessioned2023-06-17T08:57:08Z
dc.date.available2023-06-17T08:57:08Z
dc.date.issued2020-10
dc.description© 2020 The Author(s). Artículo firmado por 24 autores. It is a pleasure to thank the anonymous referee for thoughtful comments that lead to a significant improvement of the manuscript. This publication is based on data obtained with the MEGARA instrument at the Gran Telescopio Canarias, installed in the Spanish Observatorio del Roque de los Muchachos, in the island of La Palma. MEGARA has been built by a Consortium led by the Universidad Complutense de Madrid (Spain) and that also includes the Instituto de Astrofísica, Óptica y Electrónica (México), Instituto de Astrofísica de Andalucía (CSIC, Spain) and the Universidad Politécnica de Madrid (Spain). MEGARA is funded by the Consortium institutions, GRANTECAN S.A. and European Regional Development Funds (ERDF), through Programa Operativo Canarias FEDER 2014-2020. We thank CONACyT for the research grants CB-A1-S25070 (YDM), CB-A1-S-22784 (DRG), and CB-A1-S-28458 (SS). VMAGG is funded by UNAM DGAPA PAPIIT project number IA100318. Authors acknowledge financial support from the Spanish MINECO under grant numbers AYA2016-79724-C4-4-P, AYA2016-75808-R, AYA2017- 90589-REOT and RTI2018-096188-B-I00.
dc.description.abstractWe here report the detection of extended He ii λ4686 nebular emission in the central region of NGC 1569 using the integral field spectrograph MEGARA at the 10.4-m Gran Telescopio Canarias. The observations cover a Field of View (FoV) of 12.5 arcsec×11.3 arcsec at seeing-limited spatial resolution of ∼15 pc and at a spectral resolution of R=6000 in the wavelength range 4330–5200 Å. The emission extends over a semi-circular arc of ∼40 pc width and ∼150 pc diameter around the super star cluster A (SSC-A). The A_(V) derived using Balmer decrement varies from the Galactic value of 1.6 mag to a maximum of ∼4.5 mag, with a mean value of 2.65±0.60 mag. We infer 124±11 Wolf-Rayet (WR) stars in SSC-A using the He ii λ4686 broad feature and A_(V)=2.3 mag. The He+ ionizing photon rate from these WR stars is sufficient to explain the luminosity of the He ii nebula. The observationally-determined total He+ and H0 ionizing photon rates, their ratio, and the observed number of WR stars in SSC-A are all consistent with the predictions of simple stellar population models at an age of 4.0±0.5 Myr, and mass of (5.5±0.5)×105 Mꙩ.Our observations reinforce the absence of WR stars in SSC-B, the second most massive cluster in the FoV. None of the other locations in our FoV where He ii λ4686 emission has been reported from narrow-band imaging observations contain WR stars.
dc.description.departmentDepto. de Física de la Tierra y Astrofísica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)
dc.description.sponsorshipCONACyT
dc.description.sponsorshipUNAM DGAPA PAPIIT
dc.description.sponsorshipUniversidad Complutense de Madrid
dc.description.sponsorshipInstituto de Astrofísica, Óptica y Electrónica (México)
dc.description.sponsorshipInstituto de Astrofísica de Andalucía (CSIC)
dc.description.sponsorshipUniversidad Politécnica de Madrid (UPM)
dc.description.sponsorshipthe Consortium institutions
dc.description.sponsorshipGRANTECAN S.A
dc.description.sponsorshipEuropean Regional Development Funds (ERDF) through Programa Operativo Canarias FEDER 2014-2020
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/63583
dc.identifier.doi10.1093/mnras/staa2335
dc.identifier.issn0035-8711
dc.identifier.officialurlhttp://dx.doi.org/10.1093/mnras/staa2335
dc.identifier.relatedurlhttps://academic.oup.com/mnras
dc.identifier.relatedurlhttps://arxiv.org/abs/2008.00320
dc.identifier.urihttps://hdl.handle.net/20.500.14352/7675
dc.issue.number1
dc.journal.titleMonthly notices of the Royal Astronomical Society
dc.language.isoeng
dc.page.final1514
dc.page.initial1496
dc.publisherOxford Univ. Press
dc.relation.projectID(AYA2016-79724-C4-4-P, AYA2016-75808-R, AYA2017- 90589-REOT and RTI2018-096188-B-I00.)
dc.relation.projectIDCB-A1-S25070 (YDM); CB-A1-S-22784 (DRG); CB-A1-S-28458 (SS)
dc.relation.projectIDIA100318
dc.rights.accessRightsopen access
dc.subject.cdu52
dc.subject.keywordSuper-star clusters
dc.subject.keywordM-circle-dot
dc.subject.keywordMassive stars
dc.subject.keywordLine spectra
dc.subject.keywordIonized-gas
dc.subject.keywordStarburst
dc.subject.keywordNGC-1569
dc.subject.keywordGalaxies
dc.subject.keywordModels
dc.subject.keywordUltraviolet
dc.subject.ucmAstrofísica
dc.subject.ucmAstronomía (Física)
dc.titleMEGARA-IFU detection of extended He II λ4686 nebular emission in the central region of NGC1569 and its ionization budget
dc.typejournal article
dc.volume.number498
dspace.entity.typePublication
relation.isAuthorOfPublication303794a4-e4bf-4262-9a94-11bc46167d8e
relation.isAuthorOfPublication67ec03af-ce83-4a1a-8dd6-c4b4bc6cc3bc
relation.isAuthorOfPublication.latestForDiscovery303794a4-e4bf-4262-9a94-11bc46167d8e
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