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The cluster Terzan 5 as a remnant of a primordial building block of the Galactic bulge.

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Title: The cluster Terzan 5 as a remnant of a primordial building block of the Galactic bulge.
Authors: Ferraro, F. R., Dalessandro, E., Mucciarelli, A., Beccari, G., Rich, R. M., Origlia, L., Lanzoni, B., Rood, R. T., Valenti, E., Bellazzini, M., Ransom, S. M., Cocozza, G.
Source: Nature. 11/26/2009, Vol. 462 Issue 7272, p483-486. 4p. 1 Color Photograph, 3 Graphs.
Subjects: Star clusters, Galaxies, Stellar activity, Asterisms (Astronomy), Milky Way, Galactic bulges, Astrophysics, Astrophysicists, Convection (Astrophysics)
Abstract: Globular star clusters are compact and massive stellar systems old enough to have witnessed the entire history of our Galaxy, the Milky Way. Although recent results suggest that their formation may have been more complex than previously thought, they still are the best approximation to a stellar population formed over a relatively short timescale (less than 1 Gyr) and with virtually no dispersion in the iron content. Indeed, only one cluster-like system (ω Centauri) in the Galactic halo is known to have multiple stellar populations with a significant spread in iron abundance and age. Similar findings in the Galactic bulge have been hampered by the obscuration arising from thick and varying layers of interstellar dust. Here we report that Terzan 5, a globular-cluster-like system in the Galactic bulge, has two stellar populations with different iron contents and ages. Terzan 5 could be the surviving remnant of one of the primordial building blocks that are thought to merge and form galaxy bulges. [ABSTRACT FROM AUTHOR]
Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: The cluster Terzan 5 as a remnant of a primordial building block of the Galactic bulge.
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  Data: <searchLink fieldCode="AR" term="%22Ferraro%2C+F%2E+R%2E%22">Ferraro, F. R.</searchLink><br /><searchLink fieldCode="AR" term="%22Dalessandro%2C+E%2E%22">Dalessandro, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Mucciarelli%2C+A%2E%22">Mucciarelli, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Beccari%2C+G%2E%22">Beccari, G.</searchLink><br /><searchLink fieldCode="AR" term="%22Rich%2C+R%2E+M%2E%22">Rich, R. M.</searchLink><br /><searchLink fieldCode="AR" term="%22Origlia%2C+L%2E%22">Origlia, L.</searchLink><br /><searchLink fieldCode="AR" term="%22Lanzoni%2C+B%2E%22">Lanzoni, B.</searchLink><br /><searchLink fieldCode="AR" term="%22Rood%2C+R%2E+T%2E%22">Rood, R. T.</searchLink><br /><searchLink fieldCode="AR" term="%22Valenti%2C+E%2E%22">Valenti, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Bellazzini%2C+M%2E%22">Bellazzini, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Ransom%2C+S%2E+M%2E%22">Ransom, S. M.</searchLink><br /><searchLink fieldCode="AR" term="%22Cocozza%2C+G%2E%22">Cocozza, G.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 11/26/2009, Vol. 462 Issue 7272, p483-486. 4p. 1 Color Photograph, 3 Graphs.
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  Data: Globular star clusters are compact and massive stellar systems old enough to have witnessed the entire history of our Galaxy, the Milky Way. Although recent results suggest that their formation may have been more complex than previously thought, they still are the best approximation to a stellar population formed over a relatively short timescale (less than 1 Gyr) and with virtually no dispersion in the iron content. Indeed, only one cluster-like system (ω Centauri) in the Galactic halo is known to have multiple stellar populations with a significant spread in iron abundance and age. Similar findings in the Galactic bulge have been hampered by the obscuration arising from thick and varying layers of interstellar dust. Here we report that Terzan 5, a globular-cluster-like system in the Galactic bulge, has two stellar populations with different iron contents and ages. Terzan 5 could be the surviving remnant of one of the primordial building blocks that are thought to merge and form galaxy bulges. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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