AAS NOVA — Research Highlights 2016

Find out the latest thinking about our universe.
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bystander
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Nova: Making Supermassive Black Holes Spin

Post by bystander » Sat Dec 17, 2016 6:44 pm

Making Supermassive Black Holes Spin
Nova | American Astronomical Society | 2016 Dec 12

Where does the angular momentum come from that causes supermassive black holes (SMBHs) to spin on their axes and launch powerful jets? A new study of nearby SMBHs may help to answer this question. ...

Powerful Radio Emission from Low-mass Supermassive Black Holes Favors Disk-like Bulges - J. Wang et al
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bystander
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Nova: Determining Our Motion Through the Galaxy

Post by bystander » Sat Dec 17, 2016 6:51 pm

Determining Our Motion Through the Galaxy
Nova | American Astronomical Society | 2016 Dec 14

Though we don’t notice it from our point of view, we’re hurtling through space at breakneck speed — and one of the contributors to our overall motion through the universe is the Sun’s revolution around the center of our galaxy. A recent study uses an unusual approach to measure the speed of this rotation. ...

Detection of a Dearth of Stars with Zero Angular Momentum in the Solar Neighborhood - Jason A. S. Hunt, Jo Bovy, Raymond G. Carlberg
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bystander
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Nova: Watch Out for Falling Plasma

Post by bystander » Sat Dec 17, 2016 7:02 pm

Watch Out for Falling Plasma
Nova | American Astronomical Society | 2016 Dec 16

Sometimes plasma emitted from the Sun doesn’t escape into space, but instead comes crashing back down to the solar surface. What can observations and models of this process tell us about how the plasma falls and the local conditions on the Sun? ...

Bright Hot Impacts by Erupted Fragments Falling Back on the Sun: Magnetic Channelling - A. Petralia et al
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Re: Nova: Determining Our Motion Through the Galaxy

Post by neufer » Sat Dec 17, 2016 7:28 pm

bystander wrote:Determining Our Motion Through the Galaxy
Nova | American Astronomical Society | 2016 Dec 14

Though we don’t notice it from our point of view, we’re hurtling through space at breakneck speed — and one of the contributors to our overall motion through the universe is the Sun’s revolution around the center of our galaxy. A recent study uses an unusual approach to measure the speed of this rotation. ...
Click to play embedded YouTube video.
http://aasnova.org/2016/12/14/determining-our-motion-through-the-galaxy/ wrote:
<<The stars around us should exhibit a distribution of velocities describing their orbits about the galactic center — but those stars with zero angular momentum should have plunged directly into the galactic center long ago. These stars would have been scattered onto chaotic halo orbits after their plunge, resulting in a dearth of stars with zero angular momentum around us today.>>
Art Neuendorffer