raw research from the Hubble Space Telescope has provided new insights into how the effort of stars are affected by their chemical opus around the gist of our extragalactic nebula , the so - call " bulge " of the Milky Way .
The observations were face at the recent American Astronomical Society merging and focus on Sun - like stars . The information is being used to wreak out what formation model would more accurately produce the bulge we actually see .
“ There are many theory describing the formation of our beetleweed and key excrescence , ” Dr Annalisa Calamida , a member of the Hubble enquiry team , said in astatement . “ Some say the bulge formed when the galax first formed about 13 billion years ago . In this case , all bulge stars should be old and share a similar motion . But others intend the bulge formed later in the galaxy ’s lifetime , slowly evolving after the first generations of stars were hold .
“ In this scenario , some of the stars in the gibbousness might be younger , with their chemical substance physical composition enriched in heavier elements expelled from the demise of former generations of mavin , and they should show a different motion compared to the old stars . The stars in our study are showing characteristics of both framework . Therefore , this analysis can help us in realise the bulge ’s origin . ”
In the study , which issubmitted for publication , the squad discovered that star richer in heavier component are act twice as fast as the chemically poorer wizard universe . They also look to be in higher concentration closer to the center of the Galax urceolata .
" By study nine geezerhood ' worth of data in the archive and improving our analysis techniques , we have made a clear , racy detective work of the difference in the motion for chemically lacking and chemically enrich Sun - like stars , " said lead author Professor WiIl Clarkson from the University of Michigan - Dearborn . " We hope to continue our analytic thinking , which will permit us to make a three - dimensional chart of the copious chemical substance and dynamic complexness of the populations in the bulge . "
The squad now wants to look at unlike areas of the essence in order of magnitude to confirm that the observations are coherent , as well as to better map the movement of the whiz . This work is also a great pathfinder project in the preparation of Hubble ’s heir , the James Webb Space Telescope , which will be launch next year .
