A SINFONI view of the nuclear activity and circumnuclear star formation in NGC 4303 - II. Spatially resolved stellar populations
| Autor: | Santiago Arribas, Miriani Griselda Pastoriza, Ric Davies, Thaisa Storchi-Bergmann, Roberto B. Menezes, L. G. Dahmer-Hahn, A. Labiano, J. Piqueras López, R. A. Riffel, Luis Colina, Dinalva A. Sales, Rogemar A. Riffel, N. Z. Dametto, Leonard Burtscher |
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| Přispěvatelé: | Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Ministerio de Economía y Competitividad (España), Fundação de Amparo à Pesquisa do Estado de São Paulo, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
active [Galaxies] 010308 nuclear & particles physics Star formation Spatially resolved Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy Astronomy and Astrophysics Galaxies: active Astrophysics::Cosmology and Extragalactic Astrophysics Nuclear activity Galaxies: stellar content 01 natural sciences Astrophysics - Astrophysics of Galaxies Infrared: stars Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) stars [Infrared] 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics stellar content [Galaxies] Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Monthly Notices of the RAS (0035-8711), 482(4), 4437-4453 |
| ISSN: | 4437-4453 |
| DOI: | 10.1093/mnras/sty2996 |
| Popis: | We present a spatially resolved stellar population study of the inner ∼200 pc radius of NGC 4303 based on near-infrared integral field spectroscopy with SINFONI/VLT at a spatial resolution of 40–80 pc and using the STARLIGHT code. We found that the distribution of the stellar populations presents a spatial variation, suggesting an age stratification. Three main structures stand out. Two nuclear blobs, one composed by young stars (t ≤ 50 Myr) and one with intermediate-age stars (50 Myr < t ≤ 2 Gyr), both shifted from the centre. The third one is an internal intermediate-age spiral arm-like structure, surrounding the blob of young stars. Our results indicate that star formation has occurred through multiple bursts in this source. Furthermore, the youngest stellar populations (t 2 Gyr) are distributed along a circumnuclear star-forming ring with r ∼ 250 pc. The ring displays star formation rates (SFRs) in the range of 0.002–0.14 Myr, favouring the ‘pearls-on-a-string’ scenario. The old underlying bulge stellar population component (t > 2 Gyr) is distributed outside the two blob structures. For the nuclear region (inner ∼60 pc radius) we derived an SFR of 0.43 M yr and found no signatures of non-thermal featureless continuum and hot dust emission, supporting the scenario in which an LLAGN/LINER-like source is hidden in the centre of NGC 4303. Thus, our results reveal a rather complex star formation history in NGC 4303, with different stellar population components coexisting with a low efficiency accreting black hole in its centre. The Brazilian authors acknowledge support from FAPERGS (Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul) and CNPq (Conselho Nacional de Desenvolvimento Cientıfico e Tecnologico). L.C. acknowledges support from CNPq ´special visitor fellowship PVE 313945/2013-6 under the Brazilian program Science without Borders. L.C. and S.A. are supported by grants AYA2012-32295, AYA2012- 39408, ESP2015-68964-P, and ESP2017-83197-P, and J.P. is supported by grant AYA2017-85170-R, all from the Ministerio de Econom´ıa y Competitividad of Spain. The STARLIGHT project is supported by the Brazilian agencies CNPq, CAPES and FAPESP (Fundação de Amparo a pesquisa do Estado de Sao Paulo) and by the France-Brazil CAPES/Cofecub program |
| Databáze: | OpenAIRE |
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