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SUMMARY:Direct Observations of the Primordial Magellanic Corona
DTSTART;VALUE=DATE-TIME:20230323T091200Z
DTEND;VALUE=DATE-TIME:20230323T091400Z
DTSTAMP;VALUE=DATE-TIME:20240704T115751Z
UID:indico-contribution-271@meetings.aip.de
DESCRIPTION:Speakers: Dhanesh Krishnarao (Colorado College)\nRecent measur
 ements of a high mass for the LMC imply the LMC should host a massive Mage
 llanic Corona\, a collisionally ionized\, warm-hot gaseous halo at the vir
 ial temperature $\\sim10^{5.4}$ K initially extending out to the virial ra
 dius (100 - 130 kpc). Such a primordial Magellanic Corona would have shape
 d and fed the formation of the Magellanic Stream (e.g. Lucchini et al. 202
 0). Now\, we have discovered direct observational evidence for this Magell
 anic Corona via highly ionized oxygen (O VI)\, and indirect detections via
  C IV and Si IV\, seen in UV absorption toward background quasars using da
 ta from HST and FUSE (Krishnarao et al. 2022\, Nature)\, We find the Magel
 lanic Corona is part of a pervasive multiphase Magellanic CGM seen in many
  ionization states with a declining projected radial profile out to at lea
 st 35 kpc from the LMC and a total ionized CGM mass of $10^{(9.1 +/- 0.2)}
 M_\\odot$. This independently confirms the large mass of the LMC as dynami
 cally predicted. The evidence for the Magellanic Corona is a crucial step 
 forward in characterizing the Magellanic Group and its nested evolution wi
 th the Local Group and will help us diagnose the impact of galactic scale 
 winds emerging from star formation feedback in the LMC. In future work fro
 m an accepted HST Legacy Archival Program (PI: Kat Barger)\, we will direc
 tly measure and map this galactic scale outflow and the Magellanic Corona 
 using hundreds of sightlines towards stars in the LMC from the ULYSSES pro
 gram (Roman-Duval et al. 2020).\n\nhttps://meetings.aip.de/event/20/contri
 butions/271/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/271/
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