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SUMMARY:The nature of diffuse ionised gas in star-forming galaxies - Will 
 McClymont
DTSTART:20240522T121500Z
DTEND:20240522T124000Z
UID:TALK217060@talks.cam.ac.uk
CONTACT:107642
DESCRIPTION: It is thought that the diffuse ionised gas (DIG) is ionised v
 ia radiation leaking from HII regions\, however photoionisation models str
 uggle to replicate observed line ratio trends without introducing unconven
 tional secondary sources of ionisation. I will present a new analysis of t
 he DIG in star-forming galaxies with a high-resolution\, isolated Milky Wa
 y-like simulation. I will show how the synthetic observations are able to 
 match observed line ratio trends\, and that these trends arise from an inc
 reasing temperature and hardening radiation field in the DIG. I will demon
 strate that this is due to early stellar feedback clearing HII regions wit
 hin ~5 Myr\, unveiling a luminous population of stars with intrinsically h
 ardened SEDs which ionise low-density gas on kiloparsec scales. The state 
 of the DIG in star-forming galaxies is driven by recent star formation\, n
 ot a secondary source of ionisation.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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