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arXiv · 1909.01829

A panchromatic spatially resolved study of the inner 500pc of NGC1052 -- II: Gas excitation and kinematics

Luis G. Dahmer-Hahn·Rogério Riffel·Tiago V. Ricci·João E. Steiner·Thaisa Storchi-Bergmann·Rogemar A. Riffel·Roberto B. Menezes·Natacha Z. Dametto·Marlon R. Diniz·Juliana C. Motter·Daniel Ruschel-Dutra
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Abstract

We map the optical and near-infrared (NIR) emission-line flux distributions and kinematics of the inner 320$\times$535pc$^2$ of the elliptical galaxy NGC1052. The integral field spectra were obtained with the Gemini Telescope using the GMOS-IFU and NIFS instruments, with angular resolutions of 0''88 and 0''1 in the optical and NIR, respectively. We detect five kinematic components: (1 and 2) Two spatially unresolved components, being a broad line region visible in H$\alpha$, with a FWHM of $\sim$3200km s$^{-1}$ and an intermediate-broad component seen in the [OIII]$\lambda \lambda$4959,5007 doublet; (3) an extended intermediate-width component with 280<FWHM<450km s$^{-1}$ and centroid velocities up to 400km s$^{-1}$, which dominates the flux in our data, attributed either to a bipolar outflow related to the jets, rotation in an eccentric disc or a combination of a disc and large-scale gas bubbles; (4 and 5) two narrow (FWHM<150km s$^{-1}$) components, one visible in [OIII], and one visible in the other emission lines, extending beyond the field-of-view of our data, which is attributed to large-scale shocks. Our results suggest that the ionization within the observed field of view cannot be explained by a single mechanism, with photoionization being the dominant mechanism in the nucleus with a combination of shocks and photoionization responsible for the extended ionization.

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Luis G. Dahmer-Hahn, Rogério Riffel, Tiago V. Ricci, João E. Steiner, Thaisa Storchi-Bergmann, Rogemar A. Riffel, Roberto B. Menezes, Natacha Z. Dametto, Marlon R. Diniz, Juliana C. Motter, Daniel Ruschel-Dutra. 2019-09-04. A panchromatic spatially resolved study of the inner 500pc of NGC1052 -- II: Gas excitation and kinematics. https://doi.org/10.1093/mnras/stz2453

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