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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20220714T103000
DTEND;TZID=Atlantic/Canary:20220714T113000
UID:iactalks-1593
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1593
CREATED:2022-07-14T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Faint double-peak Ha emission discovered in the halo of low redshif
 t galaxies: is it produced by rogue intermediate mass black holes?
DESCRIPTION:Faint double-peak Ha emission discovered in the halo of low red
 shift galaxies: is it produced by rogue intermediate mass black holes?\nDr
 . Jorge Sanchez-Almeida\n\nWith the aim of detecting cosmological gas accr
 etion onto galaxies of the local Universe, we examined the Ha emission in 
 the halo of the 164 galaxies in the field of view of MUSE-Wide (Urrutia+19
 ) with observable Ha (redshift < 0.42).  An exhaustive screening o
 f the Ha images led us to select 118 reliable Ha emitting gas clouds. To o
 ur surprise, around 38 % of the time the Ha line profile shows a double pe
 ak centered at the rest-frame of the corresponding galaxy. We have explore
 d several physical scenarios to explain this Ha emission, among which accr
 etion disks around rogue  intermediate mass black holes (IMBHs) fit t
 he observations best. I will describe the data analysis (to discard, e.g, 
 instrumental artifacts and high redshift interlopers), the properties of t
 he Ha emitting clumps (their fluxes, peak separation, and spatial distribu
 tion with respect to the central galaxy), and the arguments leading to the
  IMBH hypothesis rather than other alternatives (e.g., cosmological gas, e
 xpanding bubbles, or shocks in the circum galactic medium).
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