Table 3.
Comparison between the model input parameters and the THINGS mass model results for NGC 3621.
| Parameter | Units | Best fit | Model-A | Model-B | Model-C | THINGS-ISO | THINGS-NFW |
|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| σh | km s−1 | 275 ± 32 | 280 | 275 | 265 | – | – |
| Rh | kpc | 15.26 ± 2.08 | 14.50 | 15.26 | 16.01 | – | – |
| α | – | 0.52 ± 0.22 | 0.50 | 0.52 | 0.12 | 0 | 1 |
| β | – | 2.80 ± 0.32 | 3.12 | 2.80 | 2.75 | 2 | 3 |
| Md | 1010 M⊙ | 1.90 ± 0.31 | 2.20 | 1.90 | 1.38 | 1.95[dB08] | 1.95[dB08] |
| Rd | kpc | 2.45 ± 0.25 | 2.60 | 2.45 | 2.62 | 2.61[W08] | 2.61[W08] |
| Mg | 1010 M⊙ | 0.89 ± 0.05 | 0.94 | 0.89 | 1.11 | 0.70[W08] | 0.70[W08] |
| Rg | kpc | 14.89 ± 0.03 | 15.00 | 14.98 | 12.32 | – | – |
| σb | km s−1 | 62 ± 17 | 50 | 62 | 40 | – | – |
| Rb | kpc | 0.96 ± 0.22 | 0.60 | 0.96 | 1.01 | – | – |
| Mb | 1010 M⊙ | 0.17 ± 0.01 | 0.07 | 0.17 | 0.08 | – | – |
| ρ0 | 10−3 M⊙ pc−3 | – | – | – | – | 14.4[dB08] | – |
| Rc | kpc | – | – | – | – | 5.54[dB08] | - |
| V200 | km s−1 | – | – | – | – | – | 165[dB08] |
| Rs | kpc | – | – | – | – | – | 28.8[dB08] |
| ΥD | M⊙/L⊙ | 0.31 ± 0.05 | 0.31 | 0.31 | 0.31 | 0.60a | 0.60 |
| ΥB | M⊙/L⊙ | 1.13 ± 0.35 | 1.13 | 1.13 | 1.13 | – | – |
| Qd | – | – | 0.53 | 0.49 | 0.34 | – | – |
| Xd | – | – | 1.75 | 1.57 | 1.26 | – | – |
Notes. ΥD and ΥD are the best fit mass-to-light ratio for the stellar disk and bulge respectively. Qd and Xd are the disk stability parameters measured at 2.2 Rd. The ISO and NFW THINGS mass model results with fixed mass-to light ratio are shown in columns 7 and 8 for comparison. dB08: de Blok et al. (2008), W08: Walter et al. (2008), Rc and Rs are the ISO and NFW scale radius respectively.
Υ* as measured from a diet-Salpeter IMF It is worth noting that Υ* measured using the Kroupa IMF is 0.42 (de Blok et al. 2008).
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