The True Durations of Starbursts: HST Observations of Three Nearby Dwarf Starburst Galaxies - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado




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Abstract: The duration of a starburst is a fundamental parameter affecting theevolution of galaxies yet, to date, observational constraints on the durationsof starbursts are not well established. Here we study the recent star formationhistories SFHs of three nearby dwarf galaxies to rigorously quantify theduration of their starburst events using a uniform and consistent approach. Wefind that the bursts range from ~200 - ~400 Myr in duration resolving thetension between the shorter timescales often derived observationally with thelonger timescales derived from dynamical arguments. If these three starburstsare typical of starbursts in dwarf galaxies, then the short timescales 3 - 10Myr associated with starbursts in previous studies are best understood as-flickering- events which are simply small components of the larger starburst.In this sample of three nearby dwarfs, the bursts are not localized events. Allthree systems show bursting levels of star formation in regions of both highand low stellar density. The enhanced star formation moves around the galaxyduring the bursts and covers a large fraction of the area of the galaxy. Thesemassive, long duration bursts can significantly affect the structure, dynamics,and chemical evolution of the host galaxy and can be the progenitors of-superwinds- that drive much of the recently chemically enriched material fromthe galaxy into the intergalactic medium.



Autor: Kristen B. W. McQuinn, Evan D. Skillman, John M. Cannon, Julianne J. Dalcanton, Andrew Dolphin, David Stark, Daniel Weisz

Fuente: https://arxiv.org/







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