Table 2.
Pattern speed and star formation timescales.
| Galaxy | Arm | ρ | ΩP | ΔΩP | tHα | ΔtHα |
|---|---|---|---|---|---|---|
| NGC 1385 | all | 0.31 | 26.1 | 13.8 | 8.96 | 3.32 |
| NGC 1385 | sp1 | 0.25 | 25.8 | 18.3 | 8.92 | 4.42 |
| NGC 1385 | sp2 | 0.36 | 26.3 | 21.6 | 9.00 | 5.18 |
| NGC 1566 | all | 0.56 | 25.0 | 4.8 | 2.47 | 0.32 |
| NGC 1566 | sp1 | 0.50 | 24.0 | 6.0 | 2.74 | 0.46 |
| NGC 1566 | sp2 | 0.61 | 26.0 | 7.0 | 1.77 | 0.33 |
| NGC 2283 | all | 0.32 | 28.2 | 7.0 | 1.79 | 0.29 |
| NGC 2283 | sp1 | 0.31 | 29.9 | 11.4 | 4.72 | 1.20 |
| NGC 2283 | sp2 | 0.37 | 28.0 | 9.3 | 1.18 | 0.25 |
| NGC 4303 | all | 0.40 | 34.8 | 20.1 | 12.27 | 4.93 |
| NGC 4303 | sp1 | 0.25 | 38.1 | 65.2 | 27.39 | 32.76 |
| NGC 4303 | sp2 | 0.46 | 32.9 | 12.8 | 5.15 | 1.41 |
Notes. ρ is the strength of the correlations of θ (deg) vs Ω (km s−1 kpc−1), and the implied pattern speed and star formation timescale following Egusa et al. 2009 for the four galaxies with mean positive offsets and a significant radial trend. ‘sp1’ and ‘sp2’ denote the fits for individual spiral arms, whereas ‘all’ lists the fits for all spiral arms in a given galaxy simultaneously. Pattern speeds are in units of km s−1 kpc−1 and star formation timescale are in units of Myr.
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