BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//ZContent.net//ZapCalLib 1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20170824T103000
DTEND;TZID=Atlantic/Canary:20170824T113000
UID:iactalks-1071
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1071
CREATED:2017-08-24T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The reports of thick discs' death are greatly exaggerated: Thick di
 scs are NOT artefacts caused by diffuse scattered light
DESCRIPTION:The reports of thick discs' death are greatly exaggerated: Thic
 k discs are NOT artefacts caused by diffuse scattered light\nDr. Sébastie
 n Comerón\n\nThe reports of thick discs' death are greatly exaggerated: T
 hick discs are NOT artefacts caused by diffuse scattered lightRecent  stud
 ies have made the community aware of the importance of accounting  for sca
 ttered light when examining low surface brightness galaxy  features such a
 s thick discs. In past studies on thick discs of edge-on  galaxies the poi
 nt spread function (PSF) effects were not taken into  account or were mode
 lled with a Gaussian kernel.We  have re-examined results on photometric de
 compositions of discs in the  Spitzer Survey of Stellar Structure of Galax
 ies (S4G) using a revised  PSF model that accounts for extended wings out 
 to more than 2.5  arcminutes. We study 141 edge-on galaxies, so we more th
 an double the  samples examined in past studies. This is the largest sampl
 e of  extragalactic thick discs studied so far.The  main difference betwee
 n our current fits and those presented in the  past is that now the scatte
 red light from the thin disc dominates the  surface brightness at levels b
 elow 26 mag arcsec-2. This change,  however, does not affect drastically a
 ny of our previously presented  results: - Thick discs are nearly ubi
 quitous. They are not an artefact caused by scattered light as has been su
 ggested elsewhere. -  Thick discs have masses comparable to those of 
 thin discs in low-mass  galaxies (with circular velocities v_c<120 km s
 -2) whereas they are  typically less massive than the thin discs in high-m
 ass galaxies.- Thick discs and central mass concentrations seem to have fo
 rmed at the same epoch from a common material reservoir.-  Approximately s
 ixty per cent of the up-bending breaks in face-on  galaxies are caused by 
 the superposition of a thin and a thick disc  where the scale-length of th
 e latter is the largest.
END:VEVENT
END:VCALENDAR