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A SINFONI view of the nuclear activity and circumnuclear star formation in NGC 4303 – II. Spatially resolved stellar populations

2018; Oxford University Press; Volume: 482; Issue: 4 Linguagem: Inglês

10.1093/mnras/sty2996

1365-2966

N. Z. Dametto, Rogério Riffel, L. Colina, Rogemar A. Riffel, Javier Piqueras López, R. Davies, L. Burtscher, R. B. Menezes, S. Arribas, M. G. Pastoriza, Á. Labiano, Thaisa Storchi‐Bergmann, L G Dahmer-Hahn, Dinalva A. Sales,

Astrophysical Phenomena and Observations

We present a spatially resolved stellar population study of the inner $\sim$200\,pc radius of NGC4303 based on near-infrared integral field spectroscopy with SINFONI/VLT at a spatial resolution of 40-80pc and using the STARLIGHT code. We found 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 $\leq$ 50Myr) and one with intermediate-age stars (50Myr $$ 2Gyr) is distributed outside the two blob structures. For the nuclear region (inner $\sim$60pc radius) we derived a SFR of 0.43\,M$_{\odot}$yr$^{-1}$ and found no signatures of non-thermal featureless continuum and hot dust emission, supporting the scenario in which a LLAGN/LINER-like source is hidden in the centre of NGC4303. Thus, our results reveal a rather complex star formation history in NGC4303, with different stellar population components coexisting with a low efficiency accreting black hole in its centre.