Christer Sandin (AIP)

Identifying, measuring, and correcting for effects of diffuse scattered light
When May 26, 2016 from 02:30 PM to 03:30 PM
  • Colloquium
Where SH Lecture Hall
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All surface-brightness structures of integrated light are affected by scattered light. Nobody has up to now correctly accounted for all relevant effects of such scattered light - and the implications have turned out to be alarming regarding the origin of diffuse galaxy haloes and their colours. My studies (Sandin 2014, 2015) show that scattered light forms diffuse haloes around all types of galaxies. The point spread function describes the effects and extent of this scattered light, which is of instrumental and atmospheric origin. I will address the properties of the point spread function and its effects on the characterization of the outer faint stellar haloes of galaxies, including edge-on and face-on disc galaxies, and elliptical galaxies. It is only possible to measure real physical components of structures and colours after the scattered-light component has been accurately removed.