Sentences with phrase «of background quasar»
The galaxies were initially found by the absorption of background quasar light passing through the galaxies.
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Image of the gravitational lens RX J1131 - 1231 galaxy with the lens galaxy at the center and four lensed background quasars.
The ideal background «lights» for such a study are quasars, which are very distant bright cores of active galaxies powered by black holes.
Jackson and colleagues used the Karl G. Jansky Very Large Array, in New Mexico, US, to study four examples of gravitational lens systems where the background quasar appears in a ring of four, distorted images.
«We had expected we would see faint emissions right on top of the quasar, and instead we saw strong bright carbon emission from the galaxies at large separations from their background quasars,» said J. Xavier Prochaska, professor of astronomy and astrophysics at UC Santa Cruz and coauthor of the paper.
From our perspective on Earth, there will be rare cases where a distant background quasar and a stream of primordial gas near a foreground galaxy are exactly aligned on the night sky.
The plane to the far right shows the background galaxy and overlaid in the center of the galaxy is a bright white light representing a quasar.
Artists impression of the power of background galaxies to measure the size of gas clouds as compared to the conventional method of using quasars.
«The polarization of the waves coming from the background quasar, combined with the fact that the waves producing the two lensed images traveled through different parts of the intervening galaxy, allowed us to learn some important facts about the galaxy's magnetic field,» said Sui Ann Mao, Minerva Research Group Leader for the Max Planck Institute for Radio Astronomy in Bonn, Germany.
These include observations of the microwave background radiation — the relic radiation of the early universe — and surveys of astronomical objects — galaxies, quasars, supernovae, gamma - ray bursters,... — over large fractions of the sky out to large fractions of the radius of the observable universe.