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Paper: The Extraordinarily Variable Star Formation History of the Nuclear Disc of the Milky Way
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 287
Authors: Nogueras-Lara, F.; Schödel, R.
Abstract: The nuclear stellar disc at the GC shows signs of intense star formation in the past several tens of millions of years, but its overall formation history has remained unknown up to now. Using the 0.2” angular resolution JHKs data from the GALACTICNUCLEUS survey, we found that in contrast to the previously accepted paradigm of quasi-continuous star formation, the bulk of its stars formed >8 Gyr ago, followed by a long quiescence period abruptly ended by an outstanding event 1 Gyr ago, during which roughly 5% of its mass formed very rapidly (<100 Myr). Our findings suggest that our Galaxy's bar may have formed recently, and that the central black hole may have acquired most of its mass in the early days of the Milky Way.
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