NEW DENSITY PROFILE AND STRUCTURAL PARAMETERS OF THE COMPLEX STELLAR SYSTEM TERZAN 5
link https://doi.org/10.1088/0004-637X/717/2/653account_box Lanzoni, B.account_box Ferraro, F. R.account_box Dalessandro, E.account_box Mucciarelli, A.account_box Beccari, G.account_box Miocchi, P.account_box Bellazzini, M.account_box Rich, R. M.account_box Origlia, L.account_box Valenti, E.account_box Rood, R. T.account_box Ransom, S. M.
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Terzan 5 is a globular cluster-like stellar system in the Galactic bulge which has been recently found to harbor two stellar populations with different iron content and probably different ages. This discovery suggests that Terzan 5 may be the relic of a primordial building block that contributed to the formation of the Galactic bulge. Here we present a re-determination of the structural parameters (center of gravity, density and surface brightness profiles, total luminosity, and mass) of Terzan 5, as obtained from the combination of high-resolution (ESO-MAD and Hubble Space Telescope ACS-WFC) and wide-field (ESO-WFI) observations. We find that Terzan 5 is significantly less concentrated and more massive than previously thought. Still it has the largest collision rate of any stellar aggregate in the Galaxy. We discuss the impact of these findings on the exceptional population of millisecond pulsars harbored in this stellar system.
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| Autor | Lanzoni, B. Ferraro, F. R. Dalessandro, E. Mucciarelli, A. Beccari, G. Miocchi, P. Bellazzini, M. Rich, R. M. Origlia, L. Valenti, E. Rood, R. T. Ransom, S. M. |
| Título | NEW DENSITY PROFILE AND STRUCTURAL PARAMETERS OF THE COMPLEX STELLAR SYSTEM TERZAN 5 |
| Revista | Astrophysical journal |
| ISSN | 0004-637X |
| Volumen | 717 |
| Número de publicación | 2 |
| Página inicio | 653 |
| Página final | 657 |
| Fecha de publicación | 2010 |
| Resumen | Terzan 5 is a globular cluster-like stellar system in the Galactic bulge which has been recently found to harbor two stellar populations with different iron content and probably different ages. This discovery suggests that Terzan 5 may be the relic of a primordial building block that contributed to the formation of the Galactic bulge. Here we present a re-determination of the structural parameters (center of gravity, density and surface brightness profiles, total luminosity, and mass) of Terzan 5, as obtained from the combination of high-resolution (ESO-MAD and Hubble Space Telescope ACS-WFC) and wide-field (ESO-WFI) observations. We find that Terzan 5 is significantly less concentrated and more massive than previously thought. Still it has the largest collision rate of any stellar aggregate in the Galaxy. We discuss the impact of these findings on the exceptional population of millisecond pulsars harbored in this stellar system. |
| Derechos | acceso restringido |
| DOI | 10.1088/0004-637X/717/2/653 |
| Enlace | |
| Id de publicación en WoS | WOS:000280650800004 |
| Palabra clave | globular clusters: individual (Terzan 5) stars: evolution |
| Tipo de documento | artículo |