We present the first 3D spectroscopic observations of a nearby H i detected poststarburst , or E+A , galaxy , ( catalog SDSS J230743.41+152558.4 ) , obtained with the VIMOS IFU spectrograph at ESO VLT .
Using the NBursts full spectral fitting technique , we derive maps of stellar kinematics , age , and metallicity out to 2–3 half-light radii .
Our analysis reveals a large-scale rapidly rotating disc ( v _ { circ } = 300 km s ^ { -1 } ) with a positive age gradient ( 0.6 to 1.5 Gyr ) , and a very metal-rich central region ( [ Fe/H ] =+0.25 dex ) .
If a merger or interaction is responsible for triggering the starburst , the presence of this undisturbed disc suggests a minor merger with a gas-rich satellite as the most plausible option , rather than a disruptive major merger .
We find spectroscopic evidence for the presence of a LINER or AGN .
This is an important clue to the feedback mechanism that truncated the starburst .
The presently observed quiescent phase may well be a temporary episode in the galaxy ’ s life . ( catalog SDSS J230743.41+152558.4 ) is gas-rich and may restart forming stars , again becoming blue before finally settling at the red sequence .