2017MNRAS.471.3347W

Query : 2017MNRAS.471.3347W

2017MNRAS.471.3347W - Mon. Not. R. Astron. Soc., 471, 3347-3358 (2017/November-1)

Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud - II. Relative ages and distances for six ancient globular clusters.

WAGNER-KAISER R., MACKEY D., SARAJEDINI A., CHABOYER B., COHEN R.E., YANG S.-C., CUMMINGS J.D., GEISLER D. and GROCHOLSKI A.J.

Abstract (from CDS):

We analyse Hubble Space Telescope observations of six globular clusters in the Large Magellanic Cloud (LMC) from programme GO-14164 in Cycle 23. These are the deepest available observations of the LMC globular cluster population; their uniformity facilitates a precise comparison with globular clusters in the Milky Way. Measuring the magnitude of the main-sequence turn-off point relative to template Galactic globular clusters allows the relative ages of the clusters to be determined with a mean precision of 8.4 per cent, and down to 6 per cent for individual objects. We find that the mean age of our LMC cluster ensemble is identical to the mean age of the oldest metal-poor clusters in the Milky Way halo to 0.2 ± 0.4 Gyr. This provides the most sensitive test to date of the synchronicity of the earliest epoch of globular cluster formation in two independent galaxies. Horizontal branch magnitudes and subdwarf fitting to the main sequence allow us to determine distance estimates for each cluster and examine their geometric distribution in the LMC. Using two different methods, we find an average distance to the LMC of 18.52 ± 0.05.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): globular clusters: individual: NGC 1466 - globular clusters: individual: NGC 1841 - globular clusters: individual: NGC 2210 - globular clusters: individual: NGC 2257 - globular clusters: individual: Reticulum - globular clusters: individual: Hodge 11 - globular clusters: individual: Hodge 11

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 330 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NGC 1466 GlC 03 44 32.71 -71 40 18.0   11.6 11.59     ~ 166 0
4 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 177 1
5 NGC 1841 GlC 04 45 24.38 -83 59 53.3   12.23 11.43     ~ 190 0
6 NGC 1786 Cl* 04 59 07.470 -67 44 45.44   10.1       ~ 152 0
7 NAME LMC Bar PoG 05 22 08 -69 23.5           ~ 343 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
9 NGC 2210 GlC 06 11 31.296 -69 07 17.04   10.9 10.94     ~ 196 0
10 NAME Hodge 11 GlC 06 14 22.92 -69 50 54.9   12.57 11.93     ~ 117 0
11 NGC 2257 Cl* 06 30 12.62 -64 19 40.0   13.24 12.62     ~ 228 0
12 CD-80 328 PM* 09 24 20.9742522694 -80 31 21.299040537   10.63 10.00     sdG 86 0
13 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
14 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
15 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
16 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
17 NGC 6101 GlC 16 25 48.12 -72 12 07.9           ~ 337 0
18 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
19 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 317 0
20 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 421 0
21 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
22 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
23 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
24 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 357 0
25 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 465 0
26 BD+41 3931 PM* 20 55 16.7551875178 +42 18 00.680491946       10.0   G5 103 0
27 BD+59 2407 PM* 21 39 16.1492801103 +60 17 01.797074143       10.0   G2 78 0
28 Wolf 1143 PM* 21 55 16.1462515842 +32 38 41.150257734   11.69   10.6   G2V 81 0

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