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Table 2.
Summary of giant filaments identified with different dataset and criteria.
| Filament | Identification | Velocity coherence confirmation | Reference | |||||
|---|---|---|---|---|---|---|---|---|
| samples | Dataset | Resolution | Criteria | NH2 regime | Dataset | Spectral lines | Criteria | |
| Giant molecular filament (GMF) | GLIMPSE, UKIDSS-GPS, 2MASS | ∼1−2″ | Visual inspection for long absorption or extinction feature, projected length > 1°, allowing for gaps | AV ≳ 10 | GRS, ThrUMMS | 13CO | Continuous velocity variations, without steep velocity jumps | 1, 4 |
| Cold giant filament (CGF) | Herschel Hi-Gal | ∼25−35″ | Visual inspection for “skinny long” emission feature, aspect ratio ≫10, lower temperature than surroundings | AV ∼ 5 | GRS | 13CO | Continuous velocity, without velocity broken | 2 |
| Milky Way bone (bone) | GLIMPSE, MIPSGAL | ∼2−6″ | Visual inspection for “largely continuous filamentary extinction features”, parallel to Galactic plane, within 20 pc of mid-plane, aspect ratio≥50 | AV ∼ 20 | HOPS, MALT90, BGPS, GRS, ThrUMMS | NH3, N2H+, HCO+, 13CO | Δv < 3 km s−1 per 10 pc | 3 |
| ATLASGAL filament (AF) | ATLASGAL | ∼20″ | Extracting skeletons with DisPerSEa, aspect ratio > 3 | AV ≳ 10 | ATLASGAL follow-up molecular line observationsb | NH3, N2H+, CS, 13CO | σv < 10 km s−1 between connected compact sources | 5 |
| MST filament (MF) | BGPS | ∼33″ | MST algorithm, projected length ≥10 pc, linearity > 1.5 | AV ≳ 10 | BGPS | N2H+, HCO+ | Δv < 2 km s−1 between connected clumps | 6 |
Notes.
(b)
Please see the Table 3 of Li et al. (2016) for the complete velocity references.
References. (1) Ragan et al. (2014); (2) Wang et al. (2015); (3) Zucker et al. (2015); (4) Abreu-Vicente et al. (2016); (5) Li et al. (2016); (6) Wang et al. (2016).
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