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Spatially resolved Stellar populations in Early Type Galaxies in the Near Infrared: the case of NGC 1052 – Luis Gabriel Hahn (IF/UFRGS)
3 de maio: 12:30 - 13:30
- « Estudo das populações estelares em galáxias ativas no infravermelho próximo — Exame de Qualificação — Natacha Zanon Dametto
- “Probing the feeding and feedback process in nearby AGNs: The kinematics of ionized gas and stars in a sample of nearby Active Galaxies ” — Carolina Finlez (Universidad de Concepcion) »
We map the gas excitation and kinematics, and the stellar population properties of the elliptical LINER NGC 1052 both in the optical and in the J and K Near Infrared bands. Emission-line flux distributions reveal, beside a rotation component, two double peaked regions along the radio jet. The flux-ratios show extended LINER emission throughout the 5.0×3.0” optical field of view. These regions are found to be compatible with inflows/outflows. Principal component analysis (PCA) reveal an unresolved broad line region centered at the nucleus, consistent with a low luminosity active galactic nucleus (LLAGN). This scenario is found to be compatible with a X-ray source located in the same point. In the near infrared, the emission lines are much weaker, with only the [FeII] and H2 lines displaying extended emission. Also, for the first time in the literature, we combine optical and NIR datacubes and perform stellar population synthesis. By using the optical alone, we find only contribution from old stellar populations. When adding the NIR, in the other hand, we detect a featureless continnum in the nucleus, associated with the LLAGN and compatible with the PCA results.