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The age of the young bulge-like population in the stellar system Terzan5: linking the Galactic bulge to the high-z Universe | | F.R. Ferraro
; D. Massari
; E. Dalessandro
; B. Lanzoni
; L. Origlia
; R. M. Rich
; A. Mucciarelli
; | | Date: |
6 Sep 2016 | | Abstract: | The Galactic bulge is dominated by an old, metal rich stellar population. The
possible presence and the amount of a young (a few Gyr old) minor component is
one of the major issues debated in the literature. Recently, the bulge stellar
system Terzan 5 was found to harbor three sub-populations with iron content
varying by more than one order of magnitude (from 0.2 up to 2 times the solar
value), with chemical abundance patterns strikingly similar to those observed
in bulge field stars. Here we report on the detection of two distinct main
sequence turn-off points in Terzan 5, providing the age of the two main stellar
populations: 12 Gyr for the (dominant) sub-solar component and 4.5 Gyr for the
component at super-solar metallicity. This discovery classifies Terzan 5 as a
site in the Galactic bulge where multiple bursts of star formation occurred,
thus suggesting a quite massive progenitor possibly resembling the giant clumps
observed in star forming galaxies at high redshifts. This connection opens a
new route of investigation into the formation process and evolution of
spheroids and their stellar content. | | Source: | arXiv, 1609.1515 | | Services: | Forum | Review | PDF | Favorites | |
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