XMM-Newton helps revise distance to outer spiral arms
5 hours ago
- #Milky Way structure
- #X-ray astronomy
- #space telescopes
- XMM-Newton and Chandra detected X-ray echoes from gamma-ray bursts, revealing the Milky Way's outer spiral arms are up to 10% farther than previously estimated.
- The method involved analyzing expanding ring-shaped X-ray echoes scattered by dust in spiral arms, directly measuring distances to the Outer Scutum-Centaurus Arm and Outer Arm.
- This approach provides more accurate distance measurements for the galaxy's outer regions compared to indirect modeling or Gaia's current data for those areas.
- The findings demonstrate the ongoing scientific value of long-standing missions like XMM-Newton and highlight the benefits of mission collaborations.
- Future enhancements from Gaia's upcoming data releases and the NewAthena observatory are expected to further refine our understanding of the Milky Way's structure.