Tag

Stellar Dynamics

All articles tagged with #stellar dynamics

space2 months ago•71 min saved

JWST weighs a distant 6-billion-solar-mass black hole in a 10-billion-light-year galaxy

Using the James Webb Space Telescope and gravitational lensing, astronomers tracked the motion of stars at the heart of the galaxy MRG-M0138 (about 10 billion light-years away) to weigh a dormant supermassive black hole of roughly 6 billion solar masses—the most distant black hole weighed by this method. The host galaxy is no longer forming stars, suggesting a past quasar phase that expelled gas and quenched star formation. The study, published in Science, helps chart how black holes and their galaxies grow and influence each other over cosmic time.

via Space|

#black-hole #gravitational-lensing #james-webb-space-telescope

science1 year ago•4 min saved

Unexpected Birth of Explosive White Dwarf Pairs Stuns Astronomers

Researchers have discovered that up to 40% of explosive white dwarf pairs, known as cataclysmic variables, may form in triple-star systems, challenging traditional models and highlighting the significant influence of a third star on stellar evolution, based on data from the Gaia mission and computer simulations.

via Rude Baguette|

#cataclysmic-variables #gaia-mission #science

astronomy2 years ago•9 min saved

"Unveiling the Origins of Intense Light in Tidal Disruption Events"

A study suggests that the peak light in tidal disruption events, where a star is torn apart by a black hole, may originate from shocks between the debris stream and the accretion disk. The research, based on simulations, proposes that these stream-disk shocks can produce the observed optical and ultraviolet emission in such events, shedding light on the mechanisms driving these dramatic astronomical phenomena.

via Nature.com|

#accretion #astronomy #astrophysical-simulations

science3 years ago•6 min saved

Lab-created elements shed light on neutron star explosions.

Scientists at Oak Ridge National Laboratory have produced a signature nuclear reaction that occurs on the surface of a neutron star gobbling mass from a companion star. The achievement improves understanding of stellar processes generating diverse nuclear isotopes. The team uses a unique gas jet target system, which produces the world's highest-density helium jet for accelerator experiments, to understand nuclear reactions that proceed with the same physics on Earth as in outer space.

via Phys.org|

#astrophysics #jensa #neutron-stars