High-Resolution Optical IFU Spectroscopy of the Complex Galaxy Merger II Zw 096
Abstract
Luminous and Ultra-luminous IR galaxies ((U)LIRGs) are critical for investigating feedback mechanisms due to a combination of intense star formation (SF) episodes and active galactic nuclei (AGN), particularly in the context of complex galaxy interactions. We conduct a detailed analysis of the II ZW 096 merging system using the Multi-Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT), combining high-resolution Narrow Field Mode (NFM) and large-area Wide Field Mode (WFM) observations. We mapped the morphology, kinematics, and ionizing radiation of the system's gas by fitting atomic emission lines and the optical continuum. We identify three or more distinct galaxies within II ZW 096, revealing rotational patterns and complex interactions consistent with a collapsing small galaxy group. The kinematics and ionization structures suggest high star formation rates and shock-driven processes, which align with this proposed scenario. Focusing on the D1 compact region, which contributes 40-70% of the system's IR emission, and combining information from archival multi-wavelength observations, we find strong evidence of a heavily obscured AGN powering it. Our analysis of the internal structure, interactions, and merger state of II ZW 096 offers novel insights into the galaxy evolution processes in this dynamic and highly chaotic system
Cite
@article{arxiv.2507.06339,
title = {High-Resolution Optical IFU Spectroscopy of the Complex Galaxy Merger II Zw 096},
author = {C. Riesco and E. Treister and G. Venturi and F. Bauer and G. Privon and C. Finlez and S. Zamora and D. Tubin and Y. Song and I. del Moral-Castro and C. Ricci and C. Ramos and N. Levenson and V. U and A. Medling and S. Aalto and G. D'Ago and V. Olivares and L. Barcos-Muñoz and F. Ricci and G. Olander and F. Muller-Sanchez and P. Tissera},
journal= {arXiv preprint arXiv:2507.06339},
year = {2025}
}
Comments
Apj accepted, 36 pages, 20 figures