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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20170529T110000
DTEND;TZID=Atlantic/Canary:20170529T120000
UID:iactalks-1024
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1024
CREATED:2017-05-29T11:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The MESSIER surveyor: lifting the veil on the ultra low surface bri
 ghtness universe
DESCRIPTION:The MESSIER surveyor: lifting the veil on the ultra low surface
  brightness universe\nProf. David Valls-Gabaud\n\nThe S-class MESSIER sate
 llite has           been designed to explore the extremely low surface bri
 ghtness           universe at UV and optical wavelengths. The two driving 
           science cases target the mildly- and highly non-linear regimes  
          of structure formation to test two key predictions of the LCDM   
         scenario: (1) the detection of the putative large number of       
     galaxy satellites, and (2) the identification of the filaments        
    of the cosmic web. The science requirements imply challenging          
  instrumentation issues which have only recently been solved.           Th
 e satellite will drift scan the entire sky in 6 bands           covering t
 he 200-1000 nm wavelength range to reach the           unprecedented surfa
 ce brightness levels of 34 mag/arcsec^2 in           the optical and 37 ma
 g/arcsec^2 in the UV. As usual when           uncovering new volumes in pa
 rameter space, many important           secondary science cases will also 
 result as free by-products           and will be discussed in some detail:
  the actual luminosity           function of galaxies, the contribution an
 d role of           intracluster light, the fluctuations of the cosmologic
 al           background radiation at UV and optical wavelengths, the warm 
           molecular hydrogen content of galaxies at z=0.25, time-domain   
         studies of supernovae and tidal disruption events, the           c
 hemical enrichment of the interstellar medium through mass           loss 
 of red giant stars and the accurate measure of the BAO           scale at 
 z=0.7 with over 30 million galaxies detected in           Lyman-alpha at t
 his redshift. It will provide the first           space-based reference UV
 -optical photometric catalogue of the           entire sky, and synergies 
 with GAIA, EUCLID and WFIRST will           also be discussed. 
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