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Table 4
Results of the decomposition of the IRAC 3.6 μm image for IC 2531.
| Component | Parameter | Value | Units |
|
|
|||
| 1. Thin disc: |
|
8.0 ± 0.54 | kpc |
| (BrokenExponentialDisk3D) |
|
3.33 ± 0.58 | kpc |
|
0.61 ± 0.04 | kpc | |
| Rb | 21.41 ± 3.57 | kpc | |
| i | 89.6 | deg | |
| Lt/Ltot | 0.66 ± 0.07 | – | |
| 2. Thick disc: |
|
24.87 ± 0.77 | kpc |
| (ExponentialDisk3D) |
|
1.57 ± 0.18 | kpc |
| i | 89.6 | deg | |
| LT/Ltot | 0.15 ± 0.03 | – | |
| 3. Bulge: | re,b | 1.86 ± 0.11 | kpc |
| (Sérsic) | nb | 2.26 ± 0.4 | – |
| qb | 0.85 ± 0.03 | – | |
| Lb/Ltot | 0.19 ± 0.05 | – | |
|
|
|||
| Total | Ltot | − 21.92 ± 0.19 | AB-mag |
| M ⋆ | 7.91 ± 1.69 | 1010M⊙ | |
Notes. The name of the imfit function is given in parentheses under the name of the component. To find the total stellar mass, we relied on the mass-to-light ratio at 3.6 μm of Eskew et al. (2012).
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