Timeline for For detection of distant galaxies by gravitational lensing-induced magnification, roughly what are the distance ratios from the lensing systems?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 20 at 1:05 | vote | accept | uhoh | ||
| Feb 14 at 22:09 | comment | added | pela | Observed angles of deflection are typically several arcmin. If they get much larger, the image would be too faint. So you could play around with different sets of $D_\mathrm{L}$ and $D_\mathrm{S}$ in @PM2Ring's equation to see what would give you such values of $\theta$. However, those distances are angular diameter distances, so you would need to convert to physical (comoving) distances to get your ratio. | |
| Feb 14 at 18:05 | answer | added | eshaya | timeline score: 2 | |
| Feb 14 at 1:07 | comment | added | PM 2Ring | Relevant: en.wikipedia.org/wiki/Einstein_ring which has the equation $$\theta_1 = \sqrt{\frac{4GM}{c^2}\;\frac{D_{LS}}{D_S D_L}}$$ | |
| Feb 14 at 0:50 | history | asked | uhoh | CC BY-SA 4.0 |