Webb Researchers Discover Lensed Supernova, Confirm Hubble Tension
NASA's James Webb Space Telescope discovered a lensed Type Ia supernova, SN H0pe, providing a Hubble constant measurement of 75.4 km/s/Mpc, enhancing understanding of the universe's expansion.
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NASA's James Webb Space Telescope (JWST) has made significant contributions to the measurement of the Hubble constant, which describes the universe's expansion rate. Researchers, led by Brenda Frye from the University of Arizona, discovered a gravitationally lensed Type Ia supernova, nicknamed SN H0pe, in the galaxy cluster PLCK G165.7+67.0. This supernova was identified through three distinct points of light, indicating it was lensed by the cluster's gravitational field. The phenomenon of gravitational lensing allowed astronomers to observe the supernova at different times, providing valuable data for calculating the Hubble constant. The team reported a value of 75.4 kilometers per second per megaparsec, which aligns with local universe measurements but contrasts with earlier values from the universe's youth. This discovery is crucial as it represents the second measurement of the Hubble constant using this method and the first involving a standard candle. The findings are expected to enhance understanding of the universe's expansion and resolve existing tensions in Hubble constant measurements. Future observations from JWST are anticipated to refine these results further.
- JWST discovered a lensed Type Ia supernova named SN H0pe.
- The supernova's light was observed in three images due to gravitational lensing.
- The calculated Hubble constant value is 75.4 km/s/Mpc, consistent with local measurements.
- This is the first measurement of the Hubble constant using a standard candle method.
- Future JWST observations aim to improve the precision of these measurements.
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