Speaker
Description
Almost all spiral galaxies have been observed to have a flattening rotation curve, the new Milky Way Gaia DR3 data challenges these observations. The Gaia DR3 data presents a Keplerian declining rotation curve, starting at $\sim19$ kpc and ending at $\sim26.5$ kpc from the galactic centre. This data reduces the total Milky Way mass by an order of magnitude, $M = 2.06\times10^{11} M_\odot$, compared to the previously required dark matter halo mass $M ∼ (2 − 5)\times10^{12} M_\odot$. Newtonian and modified gravity (MOG) fits are applied to the Milky Way Gaia DR3 rotation curve. The fit obtained using MOG has a total required mass of $M = 1.59\times10^{11} M_\odot$. This is in excess of the estimated visible baryon mass of the Milky Way $M_b ∼ 0.65\times10^{11} M_\odot$. The excess mass can be attributed to either dark matter or a circumula galactic hot gas.
| Submitter's Email Address | [email protected] |
|---|---|
| Recording Permission | YES |
| Virtual Audience Permission | YES |
| Photography Permission | YES |
