Near-infrared integral field spectroscopy of the Homunculus nebula around η Carinae using Gemini/CIRPASS
Sharp, R. G.; Damineli, A.; Groh, J. H.; Teodoro, M.; Barbosa, C. L.
Brazil, Australia, Germany
Abstract
This work presents the first integral field spectroscopy of the Homunculus nebula around η Carinae in the near-infrared spectral region (J band). We confirmed the presence of a hole on the polar region of each lobe, as indicated by previous near-IR long-slit spectra and mid-IR images. The holes can be described as a cylinder of height (i.e. the thickness of the lobe) and diameter of 6.5 and 6.0 × 1016 cm, respectively. We also mapped the blue-shifted component of He I λ10830 seen towards the NW lobe. Contrary to previous works, we suggested that this blue-shifted component is not related to the Paddle but it is indeed in the equatorial disc.