Mostrar registro simples

dc.contributor.authorRiffel, Rogériopt_BR
dc.contributor.authorRiffel, Rogemar Andrépt_BR
dc.contributor.authorFerrari, Fabriciopt_BR
dc.contributor.authorStorchi-Bergmann, Thaisapt_BR
dc.date.accessioned2014-04-13T01:49:49Zpt_BR
dc.date.issued2011pt_BR
dc.identifier.issn0035-8711pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/93348pt_BR
dc.description.abstractWe have used theGeminiNear-Infrared Integral-Field Spectrograph to map the age distribution of the stellar population in the inner 400 pc of the Seyfert 2 galaxy Mrk 1157 (NGC 591), at a spatial resolution of 35 pc. We have performed wavelet and principal component analysis on the data in order to remove instrumental signatures. An old stellar population component (age > ~5 Gyr) is dominant within the inner ≈130 pc which we attribute to the galaxy bulge. Beyond this region, up to the borders of the observation field, young- to intermediate-age components (0.1–0.7 Gyr) dominate. As for Mrk 1066, previously studied by us, we find a spatial correlation between this intermediate-age component and a partial ring of low stellar velocity dispersion (σ*). Low-σ* nuclear rings have been observed in other active galaxies, and our results for Mrk 1157 and Mrk 1066 reveal that they are formed by intermediate-age stars. Such age is consistent with a scenario in which the origin of the low-σ* rings is a past event which triggered an inflow of gas and formed stars which still keep the colder kinematics of the gas from which they have formed. No evidence for the presence of an unresolved featureless continuum and hot dust component – as found in Mrk1066 – is found for Mrk 1157.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofMonthly notices of the royal astronomical society. Oxford. Vol. 416, no. 1 (Sept. 2011), p. 493-500pt_BR
dc.rightsOpen Accessen
dc.subjectNucleo galaticopt_BR
dc.subjectMethods: data analysisen
dc.subjectGalaxies: individual: Mrk 1157en
dc.subjectGaláxias ativaspt_BR
dc.subjectGalaxies: individual: NGC591en
dc.subjectGalaxias seyfertpt_BR
dc.subjectGalaxias Starburstpt_BR
dc.subjectGalaxies: seyferten
dc.subjectCinemáticapt_BR
dc.subjectGalaxies: stellar contenten
dc.subjectGas ionizadopt_BR
dc.subjectGaláxia NGC 591pt_BR
dc.titleIntermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157pt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000815382pt_BR
dc.type.originEstrangeiropt_BR


Thumbnail
   

Este item está licenciado na Creative Commons License

Mostrar registro simples