ar X iv : a st ro - p h / 02 10 42 0 v 1 1 8 O ct 2 00 2 Extragalactic Globular Clusters in the Near - Infrared
نویسندگان
چکیده
Visual and near-infrared colours are used to identify intermediate-age globular cluster in early-type galaxies. In NGC 5846 and NGC 4365 colour-colour diagrams (V-I vs. V-K) reveal a sub-population in the globular cluster systems with an age much younger than the expected old populations (13-15 Gyr). A comparison with SSP models dates the formation of this younger population 2-7 Gyr back. Further evidence for multiple star formation events is given by the age distribution in both systems and the comparison to models. Our photometric age determination was confirmed by spectroscopy for a small sample of the clusters in NGC 4365.
منابع مشابه
ar X iv : a st ro - p h / 02 10 42 8 v 1 1 8 O ct 2 00 2 Star Clusters in Interacting Galaxies : The Case of M 51 Nate
متن کامل
ar X iv : a st ro - p h / 98 10 02 1 v 1 1 O ct 1 99 8 A NIR search for high - redshift clusters
We describe our preliminary results on a search for high-redshift (z > 0.5) galaxy clusters using near-infrared photometry obtained with the Omega camera at the 3.5m telescope at Calar Alto.
متن کاملar X iv : a st ro - p h / 06 10 86 3 v 1 2 9 O ct 2 00 6 The Not So Extraordinary Globular Cluster M 31 037 – B 327 1
A velocity dispersion has been measured for the luminous globular cluster M31 037–B327, claimed to be the most massive star cluster in the Local Group and to be a young “super star cluster” that has survived to an old age. M31 037– B327 has a mass comparable to that of M31 G1, but not significantly larger. Although near the upper end for the mass distribution of globular clusters, it is not an ...
متن کاملar X iv : a st ro - p h / 00 10 35 9 v 1 1 8 O ct 2 00 0 Stellar Variability in the Metal - Rich , Obscured Globular Cluster Terzan 5 1
We present the results of a search for variability in and near the core of the metal-rich, obscured globular cluster Terzan 5, using NICMOS on HST. This extreme cluster has approximately solar metallicity and a central density that places it in the upper few percent of all clusters. It is estimated to have the highest interaction rate of any galactic globular cluster. The large extinction towar...
متن کاملRTES-03 Interfaces.indd
[ B ur ns 20 07 ] B u rn s, A & W el lin gs , A C o n cu rr en t a n d R ea l-T im e Pr o gr am m in g in A d a, e d it io n C am b ri d ge U n iv er si ty P re ss 2 00 7 [ M o to ro la 19 96 ] M o to ro la Ti m e Pr o ce ss in g U n it R ef er en ce M an u al 1 99 6 p p . 1 -1 42 [ M o to ro la 20 00 ] M o to ro la M PC 56 5 & M PC 56 6 2 00 0 p p . 1 -1 31 2 [ P ea co ck 19 97 ] Pe ac o ck , ...
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 2002