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Table 7
Scale length determinations from other authors with tracers and field coverage.
| Author | Tracer | Coverage | Scale length (kpc) |
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|
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| Robin et al. (1992a,b) | optical star counts | ℓ = 189° | 2.5 ± 0.3 |
| Ruphy et al. (1996) | DENIS | ℓ = 217°,239° | 2.3 ± 0.1 |
| Porcel et al. (1998) | TMGS (NIR star counts) | 30°<ℓ< 70° for | b | > 5° | 2.1 ± 0.3 |
| Freudenreich (1998) | COBE | whole sky | 2.2 |
| Ojha (2001) | 2MASS | 7 fields for | b | > 12° | 2.8 ± 0.3 |
| Chen et al. (2001) | SDSS | 279 deg2 at high-latitude (49°< | b | < 64°) | 2.25 |
| Siegel et al. (2002) | optical star counts | optical star counts 14.9 deg2 at | b | > 25° | 2–2.5 |
| López-Corredoira et al. (2002) | 2MASS | ℓ = 180°,220° (b = 0°,3°,6°,9°,12°) | 1.97  |
| and ℓ = 155°,165° (b = 0°) | |||
| Larsen & Humphreys (2003) | APS catalog (optical) | 16 deg2 for | b | > 20° | 3.5 |
| Cabrera-Lavers et al. (2005) | 2MASS | | b | > 25° | 2.1 |
| Bilir et al. (2006) | SDSS | 6 fields (41° ≤ b ≤ 52°) | 1.9 |
| Karaali et al. (2007) | SDSS | ℓ = 60°,90°,180° (b = 45°, 50°) | 1.65–2.52 |
| Cignoni et al. (2008) | optical open clusters | NGC 6819, NGC 7789, NGC 2099 | 2.24–3.00 |
| Jurić et al. (2008) | SDSS | | b | > 25° (6500 deg2) | 2.6 ± 0.5 |
| Yaz & Karaali (2010) | SDSS | 22 fields (0°<ℓ ≤ 260°) for (44.3° ≤ b ≤ 45.7°) | 1.–1.68 |
| Chang et al. (2011) | 2MASS | | b | > 30° | 3.7 ± 1.0 |
| McMillan (2011) | kinematic | – | 3.00 ± 0.22 |
| Bovy et al. (2012) | SDSS/SEGUE | 28 000 G-type dwarfs (| b | > 45°) | 3.5 ± 0.2 |
| Robin et al. (2012) | 2MASS | | ℓ | ≤ 20° (–10° ≤ b ≤ 10°) | 2.5 |
| Cheng et al. (2012) | SDSS/SEGUE | 50°<ℓ ≤ 203° (b = −15.0°, –12.0°, ± 8°, 10.5°, 14°, 16°) | 3.4 |
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