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 optical integral field spectroscopy (IFS) observations of theMice, a major merger between two massive (>10^11Msol) gas-rich spirals NGC4676Aand B, observed between first passage and final coalescence. The spectraprovide stellar and gas kinematics, ionised gas properties and stellarpopulation diagnostics, over the full optical extent of both galaxies. The Miceprovide a perfect case study highlighting the importance of IFS data forimproving our understanding of local galaxies. The impact of first passage onthe kinematics of the stars and gas has been significant, with strong barslikely induced in both galaxies. The barred spiral NGC4676B exhibits a strongtwist in both its stellar and ionised gas disk. On the other hand, the impactof the merger on the stellar populations has been minimal thus far: starformation induced by the recent close passage has not contributed significantlyto the global star formation rate or stellar mass of the galaxies. Bothgalaxies show bicones of high ionisation gas extending along their minor axes.In NGC4676A the high gas velocity dispersion and Seyfert-like line ratios atlarge scaleheight indicate a powerful outflow. Fast shocks extend to ~6.6kpcabove the disk plane. The measured ram pressure and mass outflow rate(~8-20Msol/yr) are similar to superwinds from local ULIRGs, although NGC4676Ahas only a moderate infrared luminosity of 3x10^10Lsol. Energy beyond thatprovided by the mechanical energy of the starburst appears to be required todrive the outflow. We compare the observations to mock kinematic and stellarpopulation maps from a merger simulation. The models show little enhancement instar formation during and following first passage, in agreement with theobservations. We highlight areas where IFS data could help further constrainthe models.

The Mice at play in the CALIFA survey: A case study of a gas-rich major merger between first passage and coalescence