Search results for "disk -Galaxy"

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Gaia DR2 reveals a star formation burst in the disc 2-3 Gyr ago

2019

We use Gaia DR2 magnitudes, colours and parallaxes for stars with G<12 to explore a 15-dimensional space that includes simultaneously the initial mass function (IMF) and a non-parametric star formation history (SFH) for the Galactic disc. This inference is performed by combining the Besancon Galaxy Model fast approximate simulations (BGM FASt) and an approximate Bayesian computation algorithm. We find in Gaia DR2 data an imprint of a star formation burst 2-3 Gyr ago, in the Galactic thin disc domain, and a present star formation rate (SFR) of about 1 Msun. Our results show a decreasing trend of the SFR from 9-10 Gyr to 6-7 Gyr ago. This is consistent with the cosmological star formation …

Stellar massFOS: Physical sciencesPerturbation (astronomy)AstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysicsmass function -galaxiesstar formation rate01 natural sciencesdisk -Galaxy0103 physical sciencesGalaxy formation and evolutionAstrophysics::Solar and Stellar Astrophysicsluminosity functionDisc010303 astronomy & astrophysicsComputingMilieux_MISCELLANEOUSAstrophysics::Galaxy AstrophysicsPhysicsstellar content -Hertzsprung-Russell and C-M diagramsstars010308 nuclear & particles physicsStar formationDiscos (Astrofísica)Astronomy and Astrophysicsstellar initial mass functioninteractionsGalaxiesAstrophysics - Astrophysics of GalaxiesStarsGalaxyRedshiftevolution -Galaxystar formation historyGalàxiesEstelsStarsGalaxyGalaxies evolutionDisks (Astrophysics)[PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA]Space and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)galaxy mergeEvolució de les galàxiesAstrophysics::Earth and Planetary Astrophysics[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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