Table 1.
Observing scenarios and forecasted H0 precision.
| Current scenario | Resolution | δσ*/σ* | FWHM | Rspec/Reff | Nbin | δH0 | +50 δH0 | +50IFU δH0 |
|---|---|---|---|---|---|---|---|---|
| 7 TDCOSMO-5% | Unresolved | 5% |
 |
– | 1 | 8.5% | 7.0% | 2.7% |
| 7 TDCOSMO+O-IFU | Resolved | 5% |
 |
2 | 3 | 4.7% | 2.9% | 2.6% |
| 7 TDCOSMO+AO-IFU | Resolved | 5% |
 |
1 | 10 | 4.7% | 3.0% | 2.5% |
| 7 TDCOSMO+JWST-IFU | Resolved | 3% |
 |
2 | 10 | 3.5% | 2.6% | 2.6% |
| Future scenario | +200 δH0 | +200IFU δH0 | ||||||
| 40 TDCOSMO-5% | Unresolved | 5% |
 |
– | 1 | 7.3% | 7.1% | 1.2% |
| 40 TDCOSMO+O-IFU | Resolved | 5% |
 |
2 | 3 | 2.0% | 1.3% | 1.2% |
| 40 TDCOSMO+AO-IFU | Resolved | 5% |
 |
1 | 10 | 2.0% | 1.4% | 1.2% |
| 40 TDCOSMO+ELT-IFU | Resolved | 3% |
 |
3 | 30 | 1.5% | 1.2% | 1.2% |
Notes. We list the specifications for the different forecasts in terms of unresolved vs. resolved velocity dispersion measurements, relative precision on the velocity dispersion per lens, δσ*/σ*, angular resolution of the spectroscopic observation, FWHM, the radius out to where spectral information is obtained relative to the half-light radius of the deflector, Rspec/Reff, and the number of radial bins in the resolved measurements, Nbins. For the “current scenario”, we list the percentage precision on H0 for the 7 TDCOSMO-only lenses, δH0, when adding 50 lenses with aperture kinematics, +50 δH0, and when adding 50 lenses with IFU data, +50IFU δH0. For the “future scenario”, we assume 40 TDCOSMO lenses, and optionally 200 external lenses with and without IFU kinematics.
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