A kinematic analysis of the Giant star-forming Region of N11

TL;DR

This study provides a detailed kinematic analysis of the N11 star-forming region using high-resolution spectroscopy, revealing complex emission line profiles, broad components, and high-velocity features linked to X-ray emission.

Contribution

It offers the first high-resolution spectroscopic analysis of N11, identifying multiple emission components and their relation to X-ray features, advancing understanding of star-forming region dynamics.

Findings

Most Hα lines are single Gaussian, but multiple profiles occur centrally.

Integrated Hα profile shows a broad component with σ ≈ 12 km/s.

High-velocity features correlate with diffuse X-ray emission.

Abstract

In this work we present high resolution spectroscopic data of the giant star-forming region of N11, obtained with the GIRAFFE instrument at the Very Large Telescope. By using this data set, we find that most of the H$\alpha$ emission lines profiles in this complex can be fitted by a single Gaussian, however, multiple emission line profiles can be observed in the central region of N11. By adding all the spectra, we derive the integrated H$\alpha$ profile of this complex, which displays a width ($\sigma$) of about 12 km s$^{-1}$ (corrected by instrumental and thermal width). We find that a single Gaussian fit on the integrated H$\alpha$ profile leaves remaining wings, which can be fitted by a secondary broad Gaussian component. In addition, we find high velocity features, which spatially correlate with soft diffuse X-ray emission.