Determining the dynamical age of the LMC globular cluster NGC 1835 using the ‘dynamical clock’ - Star density profile and blue straggler stars

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Table 1.

Main properties of NGC 1835.

Parameter	Estimated value
Centre of gravity	α_J2000 = 05^h05^m06^s.7
	δ_J2000 = −69° 24′15″
Age	t = 12.5 ± 1 Gyr
King concentration	$c = 1 . 47_{- 0.14}^{+ 0.15}$ $c=1.47^{+0.15}_{-0.14}$
Central dimensionless potential	$W_{0} = 6 . 8_{- 0.5}^{+ 0.5}$ $W_0=6.8^{+0.5}_{-0.5}$
Core radius	$r_{c} = 3 . 5_{- 0.5}^{+ 0.7}$ $r_{\mathrm{c}} = 3.5^{+0.7}_{-0.5}$ arcsec (0.84 pc)
Half mass radius	$r_{h} = 13_{- 1}^{+ 3}$ $r_{\mathrm{h}} = 13^{+3}_{-1}$ arcsec (3.13 pc)
Tidal radius	$r_{t} = 109_{- 18}^{+ 36}$ $r_t = 109^{+36}_{-18}$ arcsec (26.23 pc)
Central relaxation time	logt_rc = 8.158 (yr)
Age/Central relaxation time	N_relax = 86.9

Notes. Main properties of NGC 1835 estimated in this work from the fit of the star counts density profile (see the left panel of Fig. 2). The age was estimated in Giusti et al. (2024).

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