Space and astronomy news
Astronomers have many ways to measure the distance to galaxies billions of light years away, but most of them rely uponThese are astrophysical processes that have a brightness we can calibrate, such as Cepheid variable stars or Type Ia supernovae. Of course, all of these standard candles have some inherent variability, so astronomers also look for where our assumptions about them can lead us astray.
Both of these methods focus on the brightness of the AGN, and both involve UV brightness, so both methods should give us a similar distance. But often they don’t. The authors of this paper wanted to find out why, so they looked at 58 galaxies where both methods had been used to determine their distance. They then looked for factors that might skew the results of one method relative to the other.method.
France Dernières Nouvelles, France Actualités
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