A pearl in the shell: An ultra-compact dwarf within the tidal debris surrounding spiral galaxy NGC 7531

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Volume 708 (April 2026)

A&A, 708 (2026) A172

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Table 3.

Properties of the compact stellar system.

Property	Value	Units
RA	348.6439	deg
Dec	−43.6044	deg
R_G	2.35	arcmin
R_G	15.2	kpc
g₀	20.69 ± 0.07	mag
M_g, 0	−11.02 ± 0.07	mag
(NUV − g)₀	2.29 ± 0.60	mag
(g − r)₀	0.54 ± 0.06	mag
(g − i)₀	0.72 ± 0.06	mag
(g − z)₀	0.82 ± 0.07	mag
R_h	0.13 ± 0.05	arcsec
R_h	14 ± 5	pc
P.A.	18.07 ± 25.73	degree
b/a	0.96 ± 0.02
M_★	$3 . 7_{- 0.7}^{+ 1.0} \times 10^{6}$ $Mathematical equation: $ 3.7_{-0.7}^{+1.0}\times 10^6 $$	M_⊙
Age	$3 . 7_{- 1.3}^{+ 2.0}$ $Mathematical equation: $ 3.7_{-1.3}^{+2.0} $$	Gyr
[M/H]	$+ 0 . 13_{- 0.03}^{+ 0.02}$ $Mathematical equation: $ +0.13_{-0.03}^{+0.02} $$	dex

Notes. These include right ascension and declination coordinates, projected galactocentric radius R_G, extinction-corrected g-band magnitude (apparent and absolute, g₀ and M_g, 0), colors in various filter combinations, half-light radius R_h, position angle, axis ratio b/a, stellar mass M_★, mass-weighted age and metallicity [M/H]. The uncertainties are for a fixed distance.

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