On The Origin of the Blue Tilt in Extragalactic Globular Cluster Systems
نویسندگان
چکیده
Some early-type galaxies show a correlation between color and integrated magnitude among the brighter metal-poor globular clusters (GCs). This phenomenon, known as the blue tilt, implies a mass-metallicity relationship among these clusters. In this paper we show that self-enrichment in GCs can explain several aspects of the blue tilt, and discuss predictions of this scenario. Subject headings: globular clusters: general — galaxies: star clusters
منابع مشابه
Age Estimation of Extragalactic Globular Cluster Systems
After taking into account, for the first time, the detailed systematic variation of horizontal-branch (HB) morphology with age and metallicity, our population synthesis models show that the integrated Hβ index is significantly affected by the presence of blue HB stars. Our models indicate that the strength of the Hβ index increases as much as 0.75 Å due to blue HB stars. According to our models...
متن کاملObservational Biases Masquerading as Cosmological Effects? a Cautionary Tale about Blue Tilts and Other Trends in Globular Cluster Systems
The high spatial resolution of the Hubble Space Telescope (HST) has led to tremendous progress in many areas of astronomy. The ability of the HST to peer into the bright inner regions of galaxies and distinguish between globular clusters (GCs) and background objects has been particularly beneficial to the study of clusters. But the very virtue of the HST that has been an asset to such research ...
متن کاملOn the Origin of Globular Clusters in Elliptical and cD Galaxies
Perhaps the most noteworthy of recent findings in extragalactic globular cluster (GC) research are the multimodal GC metallicity distributions seen in massive early–type galaxies. We explore the origin of these distinct GC populations, the implications for galaxy formation and evolution, and identify several new properties of GC systems. First, when we separate the metal–rich and metal–poor sub...
متن کاملWide-Field Imaging from Space of Early-Type Galaxies and Their Globular Clusters
Wide-field imaging from space will reveal a wealth of information about the globular cluster systems of any galaxies in the local universe that are observed by such a mission. Individual globular clusters around galaxies in the local universe have compact sizes that are ideal for the excellent spatial resolution afforded by spacebased imaging, while systems of these globular clusters have large...
متن کاملKeck Imaging of the Globular Cluster Systems in the Early – type Galaxies NGC 1052 and NGC 7332
The presence of two globular cluster subpopulations in early–type galaxies is now the norm rather than the exception. Here we present two more examples for which the host galaxy appears to have undergone a recent merger. Using multi–colour Keck imaging of NGC 1052 and NGC 7332 we find evidence for a bimodal globular cluster colour distribution in both galaxies, with roughly equal numbers of blu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008