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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present observations of NGC 839 made with the Wide Field Spectrograph(WiFeS) on the ANU 2.3m telescope. Our data cover a region 25" x 60" at aspatial resolution of ~1.5". The long axis of the field is aligned with thesuperwind we have discovered in this starburst galaxy. The data cover the rangeof 3700-7000 {\AA}, with a spectral resolution R~7000 in the red, and R~3000 inthe blue. We find that the stellar component of the galaxy is stronglydominated by a fast rotating intermediate-age (~400 Myr) A-Type stellarpopulation, while the gas is concentrated in a bi-conical polar funnel. We havegenerated flux distributions, emission line ratio diagnostics and velocity mapsin both emission and absorption components. We interpret these in the contextof a new grid of low-velocity shock models appropriate for galactic-scaleoutflows. These models are remarkably well fit to the data, providing for thefirst time model diagnostics for shocks in superwinds and strongly suggestingthat shock excitation is largely responsible for the extended LINER emission inthe outflowing gas in NGC 839. Our work may have important implications bothfor extended LINER emission seen in other galaxies, as well as in theinterpretation of objects with "composite" spectra. Finally, we present ascenario for the formation of E+A galaxies based upon our observations of NGC839, and its relation to M82.

NGC 839: Shocks in an M82-like Superwind