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SUMMARY:Reconstructed star-formation histories in MaNGA galaxies: Dependen
 ce on host galaxy properties and radial trends - Tobias Looser
DTSTART:20220601T121500Z
DTEND:20220601T124500Z
UID:TALK175280@talks.cam.ac.uk
CONTACT:Francisco Paz-C
DESCRIPTION:We developed a new methodology to reconstruct reliable non-par
 ametric Star Formation Histories (SFHs) from full spectral fitting using t
 he penalized pixel fitting code pPXF (Cappellari\, 2017)\, and by adopting
  a bootstrapping re-sampling scheme in combination with weight regularizat
 ion. We have applied this technique to 10\,000 MaNGA SDSS galaxies and exp
 lored the SFHs as a function of galactocentric radius\, host galaxy proper
 ties like stellar mass and star-formation state with high statistical sign
 ificance. \n\nOur spatially resolved analysis reveals cases of inside-out 
 quenching in high mass galaxies and bulge building in low mass galaxies. F
 urther\, we recover the expected trends in the chemical enrichment histori
 es of galaxies and the stellar fundamental metallicity relation (FMR). \nA
 dditionally\, very interestingly\, our technique gives room for speculatio
 n about pristine gas accretion or lack thereof. Indeed\, our analysis of M
 aNGA galaxies indicates the existence of young metal-poor populations (YMP
 P) in some populations of galaxies\, potentially tracing stars formed by t
 he recent accretion of metal-poor gas. Our spatially resolved analysis rev
 eals cases of both centrally concentrated and extended YMPP. However\, the
 se findings are still subject to significant doubts and require further te
 sting.  \n\nFinally\, I will give a brief outlook to our planned investiga
 tion of the first quenched galaxies at high redshift from the cycle 1 obse
 rvations obtained within the JWST NIRSpec GTO programme\, and by using an 
 adapted version of the methodology described above.  
LOCATION:The Hoyle Lecture Theatre + Zoom 
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