Abstract
The Galactic nuclear bulge hosts significant populations of young stars, within a few hundred parsecs around the Galactic Centre, unlike the more extended bulge. Recently, we discovered classical Cepheid variable stars (hereinafter Cepheids) in the Galactic nuclear bulge. Their ages are estimated to be ∼ 25 Myr based on the period-age relation of Cepheids. They are the first clear evidence of star formation a few tens of Myr ago. In addition, the period distribution of the Cepheids indicates that star formation rate was enhanced around ∼ 25 Myr ago compared to between 30 and 70 Myr ago. Such detailed star formation history has never been obtained for central parts of other galaxies. The timescale of the change in star formation seems to be consistent with the value, ∼ 20 Myr, suggested for gas inflow into the nuclear bulge. We discuss its implication on the evolution of the nuclear bulge.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
