C.D.S. - SIMBAD4 rel 1.7 - 2020.01.25CET13:40:08

2004A&A...428..459H - Astronomy and Astrophysics, volume 428, 459-467 (2004/12-3)

Intermediate-age globular clusters in early-type galaxies: Better age determinations by adding U-band observations to the V, I, K datasets.


Abstract (from CDS):

This paper represents an extension to a series of publications on combined optical and near-infrared photometry of globular cluster systems in early-type galaxies. Based on color-color diagrams the cumulative age distributions of their globular cluster systems have been derived and revealed intermediate age clusters in two galaxies, namely NGC 4365 and NGC 5846. The extension of this observations towards the blue wavelength range was performed in order to increase the age resolution of photometric studies. In this paper we present the results of U-band observations of NGC 4365 and NGC 5846 and their combination with previously obtained V, I and Ks-band photometry. (U-I) vs. (V-Ks) color-color diagrams are used to derive the cumulative age distribution. The later is compared to simulated globular cluster systems of known age and size composition in order to set constrains on relative ages and size of the sub-populations.

Abstract Copyright:

Journal keyword(s): galaxies: star clusters - galaxies: elliptical and lenticular, cD

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 787 0
2 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 759 1
3 NGC 7252 IG 22 20 44.7751096408 -24 40 41.905677809 12.26 12.46 12.06 11.57   ~ 659 1

    Equat.    Gal    SGal    Ecl

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