3 years ago

Serendipitous discovery of an optical emission line jet in NGC\,232.

L. Binette, I. Cruz-Gonzalez, J. P. Anderson, E. Aquino-Ortız, C. J. Walcher, S. F. Sanchez, L. Sanchez-Menguiano, L. F. Rodrıguez, J. K. Barrera-Ballesteros, C. Lopez-Coba, T. Kruhler, L. Galbany

We report the detection of a highly collimated linear emission-line structure in the spiral galaxy NGC\,232 through the use of integral field spectroscopy data from the All-weather MUse Supernova Integral field Nearby Galaxies (AMUSING) survey. This jet--like feature extends radially from the nucleus and is primarily detected in [oiii]$\lambda$5007 without clear evidence of an optical continuum counterpart. The length of the radial structure projected on sky reaches $\sim 3$ kpc, which makes NGC\,232 the second longest emission-line jet reported. The ionized gas presents extreme [Oiii]/H$\beta$ and [Nii]/H$\alpha$ line ratios, increasing along the jet-like structure. We discuss three possible scenarios to explain the observed structure: (i) direct ionization of in-falling material from the intergalactic medium by the AGN; (ii) photo-ionization by an un-detected optical counter-part of the radio jet and (iii) fast shocks ionization due to the lateral expansion of the radio jet across the ISM. Our analysis favors in-situ ionization.

Publisher URL: http://arxiv.org/abs/1711.02785

DOI: arXiv:1711.02785v1

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