Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-11-11
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Accepted for Publication in RAA, 14 pages, 8 figures and 3 tables
Scientific paper
We present the first photometric results in J, H, and K_s from 2MASS imaging of 10 classical globular clusters in the far outer regions of M31. Combined with the V and I photometric data from previous literature, we constructed the color-color diagram between J-K_s and V-I. By comparing the integrated photometric measurements with evolutionary models, we estimate the ages of these clusters. The results showed that, all of these clusters are older than $3\times 10^9$ yrs, of which 4 are older than 10 Gyrs and the other 6 are in intermediate ages between 3-8 Gyrs. The masses for these outer halo GCs are from $7.0\times 10^4 M_sun$ to $1.02\times 10^6 M_sun$. We argued that, GC2 and GC3, the ages, metallicities and the distance moduli of which are nearly the same, were accreted from the same satellite galaxy, if they did not form {\it in situ}. The statistical results show that, ages and metallicities for these 10 M31 outer halo GCs do not vary with projected radial position, and the relationship between age and metallicity doest not exit.
No associations
LandOfFree
2MASS photometry and age estimate of globular clusters in the outer halo of M31 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with 2MASS photometry and age estimate of globular clusters in the outer halo of M31, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 2MASS photometry and age estimate of globular clusters in the outer halo of M31 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-139309