Open Access
Table 1.
Typical order-of-magnitude values referred to in the text.
| Quantity | Value | Comment |
|---|---|---|
| Time delay | 106 s | ∼12 days |
| Time delay uncertainty | 10−6 s | Conservative |
| Hubble constant | 2 × 10−18 s−1 | H0 = 70 km s−1 Mpc−1 |
| Time between bursts | 108 s | ∼3 years |
| Relative time delay change | 2 × 10−10 | Between bursts, due to Hubble expansion |
| Lensing redshift | 2 × 10−12 | Due to Hubble expansion |
| Differential redshift uncertainty | 10−14 | From time-derivative of time delays |
| Image separation | 1 arcsec | |
| Transverse speed | 300 km s−1 | |
| Proper motion | 6 × 10−8 arcsec yr−1 | Transverse speed at 1 Gpc |
| Motion-induced redshift | 5 × 10−9 | |
| Galactocentric acceleration/c | 8 × 10−19 s−1 | 250 km s−1 at 8.5 kpc, MacMillan et al. (2019) |
| Acceleration of lens/c | 2.6 × 10−20 s−1 | LMC acceleration for Milky Way |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.