Table 4.
Characteristics of individual segments of spiral arms as identified by t-SNE+HDBSCAN for Cepheids younger than 150 Myr.
| Group | Slope | σslope | Intercept | σintercept | Ref. angle | Ref. radius | ln(Ref. radius) | Pitch angle | Min. angle | Max. angle |
|---|---|---|---|---|---|---|---|---|---|---|
| (kpc rad−1) | (kpc rad−1) | (kpc) | (kpc) | (rad) | (kpc) | (kpc) | (rad) | (rad) | (rad) | |
| [4] | −0.090 | 0.050 | 1.705 | 0.060 | 1.068 | 4.997 | 1.609 | 0.090 | 0.154 | 1.982 |
| [21] | −0.082 | 0.087 | 1.922 | 0.304 | 3.502 | 5.129 | 1.635 | 0.082 | 3.177 | 3.827 |
| [22] | 0.575 | 0.042 | 0.087 | 0.124 | 2.835 | 5.568 | 1.717 | −0.522 | 2.436 | 3.233 |
| [16] | 0.187 | 0.047 | 1.399 | 0.121 | 2.379 | 6.321 | 1.844 | −0.185 | 1.950 | 2.807 |
| [9] | 0.052 | 0.032 | 1.707 | 0.120 | 3.776 | 6.708 | 1.903 | −0.052 | 3.375 | 4.177 |
| [0] | −0.255 | 0.073 | 3.304 | 0.407 | 5.424 | 6.827 | 1.921 | 0.250 | 4.566 | 6.282 |
| [18] | 0.163 | 0.019 | 1.512 | 0.061 | 3.253 | 7.708 | 2.042 | −0.162 | 2.980 | 3.526 |
| [23] | 0.145 | 0.038 | 1.711 | 0.107 | 2.759 | 8.257 | 2.111 | −0.144 | 2.511 | 3.007 |
| [17] | −0.212 | 0.026 | 2.882 | 0.093 | 3.527 | 8.451 | 2.134 | 0.209 | 3.317 | 3.736 |
| [7] | 0.039 | 0.025 | 2.031 | 0.101 | 4.044 | 8.924 | 2.189 | −0.039 | 3.639 | 4.450 |
| [12] | −0.023 | 0.062 | 2.381 | 0.181 | 2.945 | 10.107 | 2.313 | 0.023 | 2.691 | 3.198 |
| [6] | 0.048 | 0.020 | 2.176 | 0.072 | 3.602 | 10.474 | 2.349 | −0.048 | 3.220 | 3.984 |
| [5] | 0.357 | 0.124 | 0.900 | 0.511 | 4.120 | 10.705 | 2.371 | −0.343 | 4.031 | 4.208 |
| [8] | 0.289 | 0.072 | 1.520 | 0.235 | 3.274 | 11.777 | 2.466 | −0.281 | 3.141 | 3.406 |
| [13] | −0.006 | 0.029 | 2.554 | 0.082 | 2.889 | 12.637 | 2.537 | 0.006 | 2.684 | 3.094 |
| [10] | 0.041 | 0.020 | 2.460 | 0.069 | 3.516 | 13.520 | 2.604 | −0.041 | 3.207 | 3.826 |
| [14] | 0.290 | 0.121 | 1.814 | 0.355 | 2.919 | 14.302 | 2.660 | −0.282 | 2.806 | 3.031 |
| [11] | 0.212 | 0.033 | 1.962 | 0.125 | 3.868 | 16.150 | 2.782 | −0.209 | 3.480 | 4.256 |
Notes. The slope and intercept have been computed in the (θ, ln r) space. The reference angle and radius have no physical meaning, they are simply selected as the midpoint of the Galactocentric azimuth range covered by a given group.
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