A pair of high velocity stars measure Milky Way dark matter halo
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by
Budgieye
moderator
Good explanation with a video of orbit of the stars, with a picture, no equations, and with video of the stars' orbit. *
The stars’ orbit puts a limit on the halo’s total mass without assuming anything about the dark matter distribution. If the stars are to remain bound to our galaxy, Németh says, the dark matter halo within their orbit must contain at least 3 trillion Suns’ worth of mass — an estimate that’s larger than what previous studies have measured.
- See more at: http://www.skyandtelescope.com/astronomy-news/speedy-stars-weigh-the-milky-ways-dark-matter-halo/?utm_source=newsletter&utm_campaign=sky-mya-nl-160429&utm_content=840839_SKY_HP_eNL_160429&utm_medium=email#sthash.mPpCIczC.dpuf
the referernce with equations, graphs, and no pictures
AN EXTREMELY FAST HALO HOT SUBDWARF STAR IN A WIDE BINARY SYSTEM
Péter Németh http://iopscience.iop.org/article/10.3847/2041-8205/821/1/L13/meta;jsessionid=4ABB511ED7DB2F66C4200D672BF6CEEC.c2
Runaway stars have been thrown out of the disk of our galaxy by supernova explosion.
Here is the star. It looks like one star, but it is a spectrographic binary. The presence of the unseen companion was determined broadening of the peaks by using a sensitive spectrograph.
http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237661069262323810
SDSS J121150.27+143716.2
- I expect applause for the correct use of a possessive apostrophe 😃
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