A new way to measure the distance to NGC1052-DF2 | Astronomy & Astrophysics (A&A)

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Volume 697 (May 2025)

A&A, 697 (2025) A144

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Table 1.

Radial velocities, velocity dispersions, photometry and other relevant data for the DF2 GCs.

GC	S/N	RV	σ_gl (Gaia-ESO)	σ_gl (Coelho)	F606W₀	F814W₀	r_eff	M/L_V
	(pix⁻¹)	(km s⁻¹)	(km s⁻¹)	(km s⁻¹)	AB(mag)	AB(mag)	(arcsec)	(M_⊙/L_⊙)
GC39	10.0	$1798 . 2_{- 1.5}^{+ 1.2}$ $1798.2_{-1.5}^{+1.2}$	6.1 $_{- 2.7}^{+ 2.0}$ $_{-2.7}^{+2.0}$	5.5 $_{- 2.1}^{+ 2.3}$ $_{-2.1}^{+2.3}$	22.37 ± 0.02	21.95 ± 0.02	0.056 ± 0.004	1.71 ± 1.32
GC59	5.9	$1782 . 8_{- 3.4}^{+ 3.6}$ $1782.8_{-3.4}^{+3.6}$	…	…	22.87 ± 0.03	22.31 ± 0.03	0.036 ± 0.002
GC71	6.8	$1795 . 1_{- 4.9}^{+ 3.8}$ $1795.1_{-4.9}^{+3.8}$	…	…	22.65 ± 0.02	22.19 ± 0.03	0.047 ± 0.003
GC73	19.0	$1797 . 7_{- 1.2}^{+ 1.4}$ $1797.7_{-1.2}^{+1.4}$	10.3 $_{- 1.7}^{+ 1.7}$ $_{-1.7}^{+1.7}$	10.9 $_{- 1.6}^{+ 2.2}$ $_{-1.6}^{+2.2}$	21.53 ± 0.02	21.06 ± 0.02	0.039 ± 0.002	1.57 ± 0.52
GC77	12.5	$1799 . 9_{- 1.1}^{+ 0.9}$ $1799.9_{-1.1}^{+0.9}$	9.7 $_{- 2.0}^{+ 2.0}$ $_{-2.0}^{+2.0}$	10.1 $_{- 2.1}^{+ 2.3}$ $_{-2.1}^{+2.3}$	22.10 ± 0.02	21.70 ± 0.02	0.086 ± 0.003	5.18 ± 2.14
GC85	10.3	$1792 . 4_{- 0.9}^{+ 0.7}$ $1792.4_{-0.9}^{+0.7}$	7.6 $_{- 1.3}^{+ 1.5}$ $_{-1.3}^{+1.5}$	8.5 $_{- 1.4}^{+ 1.2}$ $_{-1.4}^{+1.2}$	22.37 ± 0.02	21.84 ± 0.02	0.032 ± 0.002	1.55 ± 0.58
GC91	7.5	$1796 . 8_{- 3.7}^{+ 4.6}$ $1796.8_{-3.7}^{+4.6}$	…	…	22.51 ± 0.02	22.09 ± 0.03	0.072 ± 0.002
GC92	11.6	$1779 . 8_{- 1.3}^{+ 1.1}$ $1779.8_{-1.3}^{+1.1}$	7.1 $_{- 1.3}^{+ 2.3}$ $_{-1.3}^{+2.3}$	8.6 $_{- 3.2}^{+ 1.8}$ $_{-3.2}^{+1.8}$	22.13 ± 0.02	21.63 ± 0.02	0.027 ± 0.001	0.90 ± 0.46
GC98	6.1	$1776 . 7_{- 4.4}^{+ 5.7}$ $1776.7_{-4.4}^{+5.7}$	…	…	22.76 ± 0.02	22.29 ± 0.03	0.028 ± 0.002
GC101	5.4	$1836 . 3_{- 3.9}^{+ 2.2}$ $1836.3_{-3.9}^{+2.2}$	…	…	22.86 ± 0.03	22.38 ± 0.03	0.034 ± 0.002

GC93	…	…	…	…	22.76 ± 0.02	22.29 ± 0.03	0.028 ± 0.002	…
GCNEW2	…	…	…	…	23.76 ± 0.04	23.25 ± 0.04	0.044 ± 0.002	…
GCNEW3	…	…	…	…	22.58 ± 0.02	22.16 ± 0.03	0.038 ± 0.002	…
GCNEW4	…	…	…	…	24.08 ± 0.04	23.51 ± 0.05	0.021 ± 0.005	…
GCNEW5	…	…	…	…	23.90 ± 0.04	23.43 ± 0.05	0.081 ± 0.001	…
GCNEW6 ^(a)	…	…	…	…	23.69 ± 0.04	23.22 ± 0.04	0.051 ± 0.002	…
GCNEW9	…	…	…	…	23.70 ± 0.04	23.32 ± 0.04	0.134 ± 0.001	…

Notes. Upper part of table indicates GCs for which we obtained FLAMES spectra.

^(a)

GCNEW6 has no spectroscopic confirmation.

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