Table 4
Abundance measurements for the six defined regions within IFU positions 3 and 4, equivalent widths of Hβ (Weq(Hβ), and integrated red WR bump luminosities that provide an estimate of the equivalent number of WCE stars.
| Quantity | Region 1 | Region 2 | Region 3 | Pos.3 Diffuse | Region 4 | Region 5 | Region 6 | Pos.4 Diffuse | |
|
|
|||||||||
| N e | 96 ± 17 | 153 ± 17 | 58 ± 42 | 56 ± 12 | 35 ± 30 | 208 ± 48 | 57 ± 20 | 51 ± 20 | |
| Te([N ii]) | 10 555 ± 500 | 10 564 ± 1035 | 11 775 ± 1288 | 11 187 ± 219 | 9700 ± 0 a | 8048 ± 883 | 11 378 ± 758 | 9681 ± 769 | |
| Te([O iii])b | 10194 ± 906 | 11 492 ± 1639 | 11 486 ± 2102 | 10 651 ± 382 | 10 000 ± 0 | 7471 ± 1323 | 10 639 ± 927 | 8850 ± 815 | |
| O+/H+ × 104 | 1.06 ± 0.19 | 0.94 ± 0.34 | 0.56 ± 0.25 | 0.88 ± 0.07 | 1.33 ± 0.07 | 2.35 ± 1.48 | 0.65 ± 0.16 | 1.23 ± 0.40 | |
| O++/H+ × 104 | 1.45 ± 0.34 | 0.54 ± 0.27 | 0.63 ± 0.38 | 0.92 ± 0.10 | 1.16 ± 0.04 | 1.84 ± 1.93 | 0.94 ± 0.27 | 1.48 ± 0.52 | |
| O/H × 104 | 2.51 ± 0.56 | 1.46 ± 0.60 | 1.30 ± 0.64 | 1.86 ± 0.17 | 2.50 ± 0.10 | 4.46 ± 3.51 | 1.58 ± 0.47 | 2.65 ± 0.89 | |
| 12+log (O/H) | 8.40 ± 0.10 | 8.16 ± 0.18 | 8.11 ± 0.21 | 8.27 ± 0.04 | 8.40 ± 0.02 | 8.65 ± 0.34 | 8.20 ± 0.13 | 8.42 ± 0.14 | |
| N+/H+ × 106 | 2.09 ± 0.29 | 2.66 ± 0.76 | 2.40 ± 0.66 | 3.09 ± 0.16 | 3.88 ± 0.14 | 4.65 ± 2.16 | 1.68 ± 0.28 | 3.66 ± 0.84 | |
| N/H × 106 | 5.01 ± 0.75 | 4.07 ± 1.10 | 4.81 ± 1.69 | 6.22 ± 0.51 | 7.32 ± 0.33 | 10.90 ± 5.03 | 3.83 ± 0.65 | 8.06 ± 1.99 | |
| 12+log (N/H) | 6.70 ± 0.06 | 6.61 ± 0.12 | 6.68 ± 0.15 | 6.79 ± 0.04 | 6.86 ± 0.02 | 7.04 ± 0.20 | 6.58 ± 0.07 | 6.91 ± 0.11 | |
| log (N/O) | –1.70 ± 0.12 | –1.55 ± 0.21 | –1.43 ± 0.26 | –1.48 ± 0.05 | –1.53 ± 0.03 | –1.61 ± 0.39 | –1.62 ± 0.15 | –1.52 ± 0.18 | |
| S+/H+ × 106 | 0.75 ± 0.08 | 0.94 ± 0.23 | 1.03 ± 0.26 | 1.21 ± 0.06 | 1.62 ± 0.04 | 1.75 ± 0.61 | 0.47 ± 0.07 | 1.37 ± 0.25 | |
| S2+/H+ × 106 | 3.39 ± 1.02 | 1.56 ± 0.98 | 0.77 ± 0.75 | 2.94 ± 0.46 | 3.39 ± 0.51 | 5.89 ± 9.62 | 2.39 ± 0.86 | 5.88 ± 2.63 | |
| S/H × 106 | 4.36 ± 1.27 | 2.32 ± 1.11 | 1.89 ± 1.07 | 4.34 ± 0.55 | 5.23 ± 0.54 | 8.48 ± 11.30 | 3.03 ± 0.99 | 6.95 ± 2.86 | |
| 12+log (S/H) | 6.64 ± 0.13 | 6.37 ± 0.21 | 6.28 ± 0.24 | 6.64 ± 0.05 | 6.72 ± 0.04 | 6.93 ± 0.57 | 6.48 ± 0.14 | 6.84 ± 0.18 | |
| log (S/O) | –1.76 ± 0.16 | –1.80 ± 0.27 | –1.84 ± 0.32 | –1.63 ± 0.07 | –1.68 ± 0.05 | –1.72 ± 0.67 | –1.72 ± 0.19 | –1.58 ± 0.23 | |
| He/H × 102 | 8.13 ± 0.09 | 7.99 ± 0.05 | 8.99 ± 0.55 | 7.91 ± 0.07 | 8.19 ± 0.29 | 8.19 ± 0.29 | 7.92 ± 0.07 | 7.92 ± 0.11 | |
|
|
|||||||||
| Weq(Hβ) (Å) | −96.55 ± 5 | −60.12 ± 4 | −14.06 ± 2 | −55.43 ± 3 | −33.52 ± 5 | −105.35 ± 10 | −99.88 ± 10 | −42.41 ± 5 | |
| L(WR bump) | 10.65 ± 1.17 | 9.05 ± 1.17 | 4.91 ± 1.17 | 8.49 ± 1.17 | |||||
| (×1035 erg s-1) | |||||||||
| Equivalent no. of | ~1 | ~1 | ~1 | ~1 | |||||
| WCEc stars | |||||||||
Notes.
[N ii]λ5755 was undetected in this region, hence we adopted the average Te from the surrounding regions of ~9700 K.
Early-type WC stars (WCE) are expected to dominate at the metallicity of NGC 5253. To estimate the number of WC stars in each region, we used the relation given by López-Sánchez & Esteban (2010) for the C iv λ5808 luminosity of a WCE star [i.e. L(WR bump)] at the metallicity of NGC 5253. The luminosities we measure are consistent with the presence of 1 WCE star in each source.
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