PDA

View Full Version : Possible X-ray detection of Dark Matter



EigenState
2014-Feb-19, 10:55 PM
Greetings,

Two recent manuscripts discussing the possible assignment of an X-ray spectral feature to sterile neutrinos and thus possibly a direct probe of Dark Matter.

Esra Bulbul, Maxim Markevitch, Adam Foster, Randall K. Smith, Michael Loewenstein, and Scott W. Randall, Detection of An Unidentified Emission Line in the Stacked X-ray spectrum of Galaxy Clusters (http://arxiv.org/abs/1402.2301).

Alexey Boyarsky, Oleg Ruchayskiy, Dmytro Iakubovskyi, and Jeroen Franse, An unidentified line in X-ray spectra of the Andromeda galaxy and Perseus galaxy cluster (http://arxiv.org/abs/1402.4119).

Thought these might be of general interest.

Best regards,
ES

Squink
2014-Feb-22, 06:48 PM
Thought these might be of general interest.

Yup.
Slightly more accesible reports at physicsworld:

Could sterile neutrinos solve the cosmological mass conundrum? (http://physicsworld.com/cws/article/news/2014/feb/18/could-sterile-neutrinos-solve-the-cosmological-mass-conundrum)

Are ‘sterile neutrinos’ dark-matter particles after all? (http://blog.physicsworld.com/2014/02/19/are-sterile-neutrinos-dark-matter-particles-after-all/)

Copernicus
2014-Feb-22, 07:55 PM
If neutrinos are part of the missing mass, how are they captured by a galaxy if they are moving near the speed of light?

EigenState
2014-Feb-22, 09:13 PM
Greetings,


If neutrinos are part of the missing mass, how are they captured by a galaxy if they are moving near the speed of light?

Gravity. The extent to which they might constitute Dark Matter depends on their mass which is of course unknown.

Best regards,
ES

Squink
2014-Mar-10, 12:34 PM
Lovely APOD:Gamma Rays from Galactic Center Dark Matter? (http://apod.nasa.gov/apod/ap140310.html)
Galactic center seems too bright to be accounted by known gamma-ray sources. A raw image of the Galactic Center region in gamma-rays is shown above on the left, while the image on the right has all known sources subtracted -- leaving an unexpected excess.Of course, if they looked, they probably expected to find something.