Abstract：
:The nuclear bulge is a region with a radius of about 200 parsecs around the centre of the Milky Way. It contains stars with ages ranging from a few million years to over a billion years, yet its star-formation history and the triggering process for star formation remain to be resolved. Recently, episodic star formation, powered by changes in the gas content, has been suggested. Classical Cepheid variable stars have pulsation periods that decrease with increasing age, so it is possible to probe the star-formation history on the basis of the distribution of their periods. Here we report the presence of three classical Cepheids in the nuclear bulge with pulsation periods of approximately 20 days, within 40 parsecs (projected distance) of the central black hole. No Cepheids with longer or shorter periods were found. We infer that there was a period about 25 million years ago, and possibly lasting until recently, in which star formation increased relative to the period of 30-70 million years ago.
journal_name
Naturejournal_title
Natureauthors
Matsunaga N,Kawadu T,Nishiyama S,Nagayama T,Kobayashi N,Tamura M,Bono G,Feast MW,Nagata Tdoi
10.1038/nature10359subject
Has Abstractpub_date
2011-08-24 00:00:00pages
188-90issue
7363eissn
0028-0836issn
1476-4687pii
nature10359journal_volume
477pub_type
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