Understanding the unusual life of the Cartwheel galaxy using stellar populations

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Volume 688 (August 2024)

A&A, 688 (2024) A89

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Table 1.

Median values of the marginalised posterior distribution for each subregion.

Region	σ_region	Age_old	[Z/H]_old	Age_young	[Z/H]_young	Fraction_old
	[km s⁻¹]	[Gyr]	[dex]	[Gyr]	[dex]
Nucleus	72	3.17 $_{- 0.34}^{+ 0.43}$ $^{+0.43}_{-0.34}$	−0.06 $_{- 0.05}^{+ 0.05}$ $^{+0.05}_{-0.05}$	–	–	–
Inner ring	73	5.62 $_{- 1.97}^{+ 3.94}$ $^{+3.94}_{-1.97}$	0.20 $_{- 0.13}^{+ 0.11}$ $^{+0.11}_{-0.13}$	0.87 $_{- 0.23}^{+ 0.22}$ $^{+0.22}_{-0.23}$	−0.87 $_{- 0.26}^{+ 0.32}$ $^{+0.32}_{-0.26}$	0.94 $_{- 0.03}^{+ 0.02}$ $^{+0.02}_{-0.03}$
In-between	65	3.42 $_{- 0.90}^{+ 1.80}$ $^{+1.80}_{-0.90}$	0.12 $_{- 0.11}^{+ 0.11}$ $^{+0.11}_{-0.11}$	0.80 $_{- 0.14}^{+ 0.06}$ $^{+0.06}_{-0.14}$	−1.06 $_{- 0.07}^{+ 0.09}$ $^{+0.09}_{-0.07}$	0.84 $_{- 0.03}^{+ 0.03}$ $^{+0.03}_{-0.03}$
Outer ring	54	–	–	0.10 $_{- 0.02}^{+ 0.02}$ $^{+0.02}_{-0.02}$	-1.11 $_{- 0.05}^{+ 0.04}$ $^{+0.04}_{-0.05}$	–

Notes. The first column shows the velocity dispersion measurement of each region obtained from the pPXF fit. The subsequent columns show the age and stellar metallicity of the two SSPs model and their relative fraction. The errors on the median values refer to the 16th and 84th percentiles.

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