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 sub-arcsecond, Multi-Element Radio Linked Interferometer (MERLIN)observations of the decimetre radio continuum structure and neutral hydrogen(HI) absorption from the nuclear region of the starburst galaxy NGC 4194 (theMedusa Merger). The continuum structure of the central kiloparsec of the Medusahas been imaged, revealing a pair of compact radio components surrounded bymore diffuse, weak radio emission. Using the constraints provided by theseobservations and those within the literature we conclude that the majority ofthis radio emission is related to the ongoing star-formation in this mergersystem.  With these observations we also trace deep HI absorption across the detectedradio continuum structure. The absorbing HI gas structure exhibits largevariations in column densities. The largest column densities are found towardthe south of the nuclear radio continuum, co-spatial with both a nuclear dustlane and peaks in $^{12}$CO (1->0) emission. The dynamics of the HI absorption,which are consistent with lower resolution $^{12}$CO emission observations,trace a shallow north-south velocity gradient of ~320km/s/kpc. This gradient isinterpreted as part of a rotating gas structure within the nuclear region. TheHI and CO velocity structure, in conjunction with the observed gas columndensities and distribution, is further discussed in the context of the fuellingand gas physics of the ongoing starburst within the centre of this merger.

Sub-arcsecond imaging of the radio continuum and neutral hydrogen in the Medusa merger