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Bursty star formation during the Cosmic Dawn driven by delayed stellar feedback
Furlanetto
, Steven
R
; Jordan Mirocha
arXiv.org, 2021-09
Ithaca: Cornell University Library, arXiv.org
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Título:
Bursty star formation during the Cosmic Dawn driven by delayed stellar feedback
Autor:
Furlanetto
, Steven
R
;
Jordan Mirocha
Assuntos:
Astronomical models
;
Explosions
;
Feedback
;
Galaxies
;
Halos
;
Ionization
;
Luminosity
;
Physics - Astrophysics of Galaxies
;
Star & galaxy formation
;
Star formation
;
Time lag
É parte de:
arXiv.org, 2021-09
Descrição:
In recent years, several analytic models have demonstrated that simple assumptions about halo growth and feedback-regulated star formation can match the (limited) existing observational data on galaxies at z>6. By extending such models, we demonstrate that imposing a time delay on stellar feedback (as inevitably occurs in the case of supernova explosions) induces burstiness in small galaxies. Although supernova progenitors have short lifetimes (~5-30 Myr), the delay exceeds the dynamical time of galaxies at such high redshifts. As a result, star formation proceeds unimpeded by feedback for several cycles and "overshoots" the expectations of feedback-regulated star formation models. We show that such overshoot is expected even in atomic cooling halos, with masses up to ~10^10.5 Msun at z>6. However, these burst cycles damp out quickly in massive galaxies, because large haloes are more resistant to feedback so retain a continuous gas supply. Bursts in small galaxies - largely beyond the reach of existing observations - induce a scatter in the luminosity of these haloes (of ~1 mag) and increase the time-averaged star formation efficiency by up to an order of magnitude. This kind of burstiness can have substantial effects on the earliest phases of star formation and reionization.
Editor:
Ithaca: Cornell University Library, arXiv.org
Idioma:
Inglês
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