astronomy   42641

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LIGO and distance
Gravity wave detection gives us a new way to measure cosmic distances
distance  astronomy  ligo 
14 hours ago by nelson
`MAGNETARS', SOFT GAMMA REPEATERS & VERY STRONG MAGNETIC FIELDS Robert C. Duncan, University of Texas at Austin
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 
yesterday 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.
Astronomy 
yesterday 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 
yesterday by geetarista

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