English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

In this work we studied the two-dimensional ionization structure of thecircumnuclear and extranuclear regions in a sample of six low-z UltraluminousInfrared Galaxies using Integral Field Spectroscopy. The ionization conditionsin the extranuclear regions of these galaxies (~5-15 kpc) are typical of LINERsas obtained from the Veilleux-Osterbrock line ratio diagnostic diagrams. Therange of observed line ratios is best explained by the presence of fast shockswith velocities of 150 to 500 km s^{-1}, while the ionization by an AGN ornuclear starburst is in general less likely. The comparison of thetwo-dimensional ionization level and velocity dispersion in the extranuclearregions of these galaxies shows a positive correlation, further supporting theidea that shocks are indeed the main cause of ionization.  The origin of these shocks is also investigated. Despite the likely presenceof superwinds in the circumnuclear regions of these systems, no evidence forsignatures of superwinds such as double velocity components are found in theextended extranuclear regions. We consider a more likely explanation for thepresence of shocks, the existence of tidally induced large scale gas flowscaused by the merging process itself, as evidenced by the observed velocityfields characterized by peak-to-peak velocities of 400 km s^{-1}, and velocitydispersions of up to 200 km s^{-1}.Comment: 21 pages, 5 figures, accepted for publication in The Astrophysical  Journa

LINER‐like Extended Nebulae in ULIRGs: Shocks Generated by Merger‐Induced Flows