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Table 3.

Interstellar dust mass density and gas-to-dust mass ratio in the LISM.

Mass determination: Measurement Iterative
ρISD [kg/m3]
a all particles 9 − 3 + 6 × 10 − 21 $ \mathit{\phantom{0.}9_{-3\phantom{.0}}^{+6}\times 10^{-21}} $ 1 . 6 − 0.7 + 1.1 × 10 − 24 $ 1.6^{+1.1}_{-0.7}\times 10^{-24} $
b excl. vmsr < 3 km/s 2 . 4 − 0.8 + 1.2 × 10 − 23 $ 2.4_{-0.8}^{+1.2}\times 10^{-23} $ –
c excl. (1, 2, 4, 6, 7, 9) 5 . 7 − 2.2 + 4 × 10 − 21 $ \mathit{5.7^{+4}_{-2.2}\times 10^{-21}} $ 1 . 2 − 0.5 + 0.7 × 10 − 24 $ 1.2^{+0.7}_{-0.5}\times 10^{-24} $
d excl. Subset A 1 . 6 − 0.7 + 1.2 × 10 − 23 $ 1.6^{+1.2}_{-0.7}\times 10^{-23} $ 6 . 8 − 2.5 + 4 × 10 − 25 $ 6.8^{+4\phantom{.0}}_{-2.5}\times 10^{-25} $
e c & excl. 1 2 $ \frac{1}{2} $Subs. B 5 . 7 − 2.0 + 3 × 10 − 21 $ \mathit{5.7^{+3\phantom{.0}}_{-2.0}\times 10^{-21}} $ 1 . 1 − 0.5 + 0.8 × 10 − 24 $ \mathbf{1.1^{+0.8}_{-0.5}\times 10^{-24}} $
f d & excl. 1 2 $ \frac{1}{2} $Subs. B 8 − 4 + 6 × 10 − 24 $ \phantom{0.}8^{+6\phantom{.0}}_{-4}\times 10^{-24} $ 5 . 4 − 1.9 + 3.0 × 10 − 25 $ 5.4^{+3.0}_{-1.9}\times 10^{-25} $
Rg/d
a all particles 0 . 059 − 0.023 + 0.04 $ \mathit{0.059^{+0.04}_{-0.023}} $ 310 − 130 + 210 $ \phantom{0}310^{+210}_{-130} $
b excl. vmsr < 3 km/s 22 − 7 + 11 $ \phantom{0.0}22^{+11\phantom{0.0}}_{-7} $ –
c excl. (1, 2, 4, 6, 7, 9) 0 . 09 − 0.03 + 0.06 $ \mathit{\phantom{0}0.09^{+0.06\phantom{0}}_{-0.03\phantom{0}}} $ 410 − 150 + 240 $ \phantom{0}410^{+240}_{-150} $
d excl. Subset A 33 − 13 + 21 $ \phantom{0.0}33^{+21\phantom{0.0}}_{-13} $ 760 − 280 + 430 $ \phantom{0}760^{+430}_{-280} $
e c & excl. 1 2 $ \frac{1}{2} $Subs. B 0 . 09 − 0.03 + 0.05 $ \mathit{\phantom{0}0.09^{+0.05\phantom{0}}_{-0.03}} $ 460 − 190 + 320 $ \mathbf{\phantom{0}460^{+320}_{-190}} $
f d & excl. 1 2 $ \frac{1}{2} $Subs. B 61 − 26 + 50 $ \phantom{0.0}61^{+50\phantom{0.0}}_{-26} $ 1000 − 300 + 500 $ 1000^{+500}_{-300} $

Notes. The top block tabulates the ISD mass density and the bottom block the gas-to-dust mass ratio in the LISM, using either the measurement-derived (left) or the iteratively calculated (right) masses. The most likely value has been highlighted by boldface. In the respective row (a) all particles of the Krüger subset were taken into account, including those with vmsr < 3 km/s that most likely feature severely overestimated masses. All values that were based on these possibly spurious values are italicised. In the respective row (b) the measurement-derived masses for particles with vmsr < 3 km/s were discounted; this did not influence the iteratively calculated values. In the respective row (c) the six particles of Subset A that are most likely not ISD, particles (1, 2, 4, 6, 7, 9), were excluded; the ISD candidates of Subset A, particles (3, 5, 8, 10), remain. In the respective row (d) the entire Subset A (mmsr ≥ 10−12 kg) was excluded. In the respective rows (e) and (f), an additional arbitrary half of all particles above mmsr > 10−14 kg or miter > 10−15 kg were excluded according to the investigation into Subset B, either including (e) or excluding (f) the ISD candidates of Subset A.

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