Spectral Energy Distributions and Age Estimates of 39 Globular Clusters in M31

نویسنده

  • Jiansheng Chen
چکیده

This paper supplements Jiang et al. (2003), who studied 172 M31 globular clusters (GCs) and globular cluster candidates from Battistini et al. (1987) on the basis of integrated photometric measurements in the BeijingArizona-Taiwan-Connecticut (BATC) photometric system. Here, we present multicolor photometric CCD data (in the BATC system) for the remaining 39 M31 GCs and candidates. In addition, the ages of 35 GCs are constrained by comparing our accurate photometry with updated theoretical stellar synthesis models. We use photometric measurements from GALEX in the farand near-ultraviolet and 2MASS infrared JHKs data, in combination with optical photometry. Except for two clusters, the ages of the other sample GCs are all older than 1 Gyr. Their age distribution shows that most sample clusters are younger than 6 Gyr, with a peak at ∼ 3 Gyr, although the ‘usual’ complement of well-known old GCs (i.e., GCs of similar age as the majority of the Galactic GCs) is present as well. Subject headings: galaxies: individual (M31) – galaxies: star clusters – galaxies: stellar content

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تاریخ انتشار 2009