New insights into the WR nebula M1-67 with SITELLE

TL;DR

This study uses SITELLE at CFHT to analyze M1-67, revealing detailed chemical, physical, and kinematic structures, including a bow shock caused by WR124's high velocity, enhancing understanding of nebula morphology and star interaction.

Contribution

First detailed SITELLE-based analysis of M1-67 providing comprehensive emission, abundance, and velocity maps to understand nebula structure and star interaction.

Findings

Identified orthogonal chemical abundance features.

Mapped extinction, electron density, and temperature structures.

Revealed bow shock due to WR124's high velocity.

Abstract

We present a detailed study of M1-67, a well-known nebula around the population I Wolf-Rayet star WR 124 (WNh 8), based on datacubes obtained with the imaging Fourier transform spectrometer SITELLE at the Canada-France-Hawaii Telescope (CFHT). This allowed us to reconstruct detailed emission-line ratio maps that highlight clear orthogonal features from a chemical abundance point of view, a complete extinction map, as well as the electron density and temperature structures. In addition to this information, velocity maps were obtained shedding light on the bow shock structure due to the high velocity of WR124, qualified as a runaway star, which is about +190\,km\,s$^{-1}$ relative to the local ISM. Interaction between the latter structure and spherical and non-spherical outburst could explain the global morphology of M1-67.