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Metal-THINGS: On the Metallicity and Ionization of ULX Sources in NGC 925

dc.contributor.authorLARA-LÓPEZ, Maritza A.
dc.contributor.authorZINCHENKO, Igor A.
dc.contributor.authorPILYUGIN, Leonid S.
dc.contributor.authorGUNAWARDHANA, Madusha L. P.
dc.contributor.authorLÓPEZ-CRUZ, Omar
dc.contributor.authorO'SULLIVAN, Shane P.
dc.contributor.authorFELTRE, Anna
dc.contributor.authorROSADO, Margarita
hal.structure.identifierLaboratoire d'Astrophysique de Marseille [LAM]
dc.contributor.authorSÁNCHEZ-CRUCES, Mónica
hal.structure.identifierInstitut d'Astrophysique de Paris [IAP]
dc.contributor.authorCHEVALLARD, Jacopo
dc.contributor.authorDE ROSSI, Maria Emilia
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorDIB, Sami
dc.contributor.authorFRITZ, Jacopo
dc.contributor.authorFUENTES-CARRERA, Isaura
dc.contributor.authorGARDUÑO, Luis E.
dc.contributor.authorIBAR, Eduardo
dc.date.issued2021
dc.identifier.issn0004-637X
dc.description.abstractEnWe present an analysis of the optical properties of three Ultra Luminous X-ray (ULX) sources identified in NGC 925. We use Integral field unit data from the George Mitchel spectrograph in the context of the Metal-THINGS survey. The optical properties for ULX-1 and ULX-3 are presented, while the spaxel associated with ULX-2 had a low S/N, which prevented its analysis. We also report the kinematics and dimensions of the optical nebula associated with each ULX using ancillary data from the PUMA Fabry-Perot spectrograph. A BPT analysis demonstrates that most spaxels in NGC 925 are dominated by star-forming regions, including those associated with ULX-1 and ULX-3. Using the resolved gas-phase metallicities, a negative metallicity gradient is found, consistent with previous results for spiral galaxies, while the ionization parameter tends to increase radially throughout the galaxy. Interestingly, ULX-1 shows a very low gas metallicity for its galactocentric distance, identified by two independent methods, while exhibiting a typical ionization. We find that such low gas metallicity is best explained in the context of the high-mass X-ray binary population, where the low-metallicity environment favors active Roche lobe overflows that can drive much higher accretion rates. An alternative scenario invoking accretion of a low-mass galaxy is not supported by the data in this region. Finally, ULX-3 shows both a high metallicity and ionization parameter, which is consistent with the progenitor being a highly accreting neutron star within an evolved stellar population region.
dc.description.sponsorshipGENeration et Evolution des Structures du milieu InterStellaire - ANR-16-CE92-0035
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enEmission line galaxies
dc.subject.enIonization
dc.subject.enChemical abundances
dc.subject.enAbundance ratios
dc.subject.enSpectroscopy
dc.subject.enX-ray sources
dc.title.enMetal-THINGS: On the Metallicity and Ionization of ULX Sources in NGC 925
dc.typeArticle de revue
dc.identifier.doi10.3847/1538-4357/abc892
dc.subject.halPlanète et Univers [physics]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv2011.04302
bordeaux.journalThe Astrophysical Journal
bordeaux.volume906
bordeaux.peerReviewedoui
hal.identifierinsu-03678892
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//insu-03678892v1
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