astronomy   42640

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LIGO and distance
Gravity wave detection gives us a new way to measure cosmic distances
distance  astronomy  ligo 
yesterday by nelson
Soft gamma repeaters ("SGRs") are X-ray stars that emit bright, repeating flashes of soft (i.e. low-energy) gamma rays. The physical nature of these stars was a mystery for many years. In 1992, it was proposed that SGRs are magnetically-powered neutron stars, or magnetars. Subsequent observational studies lent support to this hypothesis. Astronomers now think that all emissions detected from SGRs and from a related class of stars known as anomalous X-ray pulsars ("AXPs") are powered by magnetic field decay. Here I will explain how these strange, physically-extreme stars form, and why they emit steadily pulsating X-rays with sporadic, bright outbursts. I will also tell the story of their discovery and of the theoretical efforts which helped to reveal their bizarre nature.
astronomy  science 
2 days ago by rmohns
First observations of merging neutron stars mark a new era in astronomy: Event linked to the detection of gravitational waves -- ScienceDaily
Their analysis indicates, for example, that the merger triggered a relativistic jet (material moving at near the speed of light) that generated the gamma-ray burst, while matter torn from the merger system and ejected at lower speeds drove the r-process and the kilonova emissions at ultraviolet, optical, and infrared wavelengths.
2 days ago by zephyr777
Neutron-Star Collision Shakes Space-Time and Lights Up the Sky | Quanta Magazine
Astronomers have for the first time matched a gravitational-wave signal to a kilonova’s burst of light, observations that will “go down in the history of
astronomy  astrophysics 
2 days ago by geetarista

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