Structural parameters, chronological age, and dynamical age of the Large Magellanic Cloud globular cluster NGC 1754

Open Access

Table 1

Main properties of NGC 1754.

Parameter	Estimated value
Center of gravity	α_J2000 = 04^h54^m18^s.66
	δ_J2000 = −70^°26^′31.03^′′
Age	$t = {12.8}_{- 0.4}^{+ 0.4} G y r$ $t=12.8_{-0.4}^{+0.4} \mathrm{Gyr}$
King concentration	$c = {1.47}_{- 0.11}^{+ 0.12}$ $c=1.47_{-0.11}^{+0.12}$
Central dimensionless potential	$W_{0} = {6.8}_{- 0.4}^{+ 0.4}$ $W_{0}=6.8_{-0.4}^{+0.4}$
Core radius	$r_{c} = {3.5}_{- 0.5}^{+ 0.5} arcsec (0.84 p c)$ $r_{c}=3.5_{-0.5}^{+0.5} \operatorname{arcsec}(0.84 \mathrm{pc})$
Half mass radius	$r_{h} = 13_{- 1}^{+ 2} arcsec (3.13 p c)$ $r_{h}=13_{-1}^{+2} \operatorname{arcsec}(3.13 \mathrm{pc})$
Tidal radius	$r_{t} = 108_{- 16}^{+ 22} arcsec (25.98 p c)$ $r_{t}=108_{-16}^{+22} \operatorname{arcsec}(25.98 \mathrm{pc})$
Central relaxation time	log(t_rc/yr)=7.969
Age/Central relaxation time	N_relax = 137

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