81 research outputs found
New emission line at ~3.5 keV - observational status, connection with radiatively decaying dark matter and directions for future studies
Recent works of [1402.2301,1402.4119], claiming the detection of extra
emission line with energy ~3.5 keV in X-ray spectra of certain clusters of
galaxies and nearby Andromeda galaxy, have raised considerable interest in
astrophysics and particle physics communities. A number of new observational
studies claim detection or non-detection of the extra line in X-ray spectra of
various cosmic objects. In this review I summarize existing results of these
studies, overview possible interpretations of the extra line, including
intriguing connection with radiatively decaying dark matter, and show future
directions achievable with existing and planned X-ray cosmic missions.Comment: 8 pages, invited review for Advances in Astronomy and Space Physics.
Comments are welcom
Search for cyclotron absorptions from magnetars in the quiescence with XMM-Newton
In this work, we perform the detailed analysis of absorption features in
spectra of magnetar candidates observed by XMM-Newton satellite. No significant
line-like feature has been found. This negative result may indicate the
possible presence of smoothing out the absorption features mechanisms.Comment: 4 pages, 2 figures, to appear in Contributed Papers of 17th Young
Scientific Conference held in Kyiv (Ukraine), April 26 - May 1, 201
Next decade of sterile neutrino studies
We review the status of sterile neutrino dark matter and discuss
astrophysical and cosmological bounds on its properties as well as future
prospects for its experimental searches. We argue that if sterile neutrinos are
the dominant fraction of dark matter, detecting an astrophysical signal from
their decay (the so-called 'indirect detection') may be the only way to
identify these particles experimentally. However, it may be possible to check
the dark matter origin of the observed signal unambiguously using its
characteristic properties and/or using synergy with accelerator experiments,
searching for other sterile neutrinos, responsible for neutrino flavor
oscillations. We argue that to fully explore this possibility a dedicated
cosmic mission - an X-ray spectrometer - is needed.Comment: 23 pages, 6 figure
Potential of LOFT telescope for the search of dark matter
Large Observatory For X-ray Timing (LOFT) is a next generation X-ray
telescope selected by European Space Agency as one of the space mission
concepts within the ``Cosmic Vision'' programme. The Large Area Detector on
board of LOFT will be a collimator-type telescope with an unprecedentedly large
collecting area of about 10 square meters in the energy band between 2 and 100
keV. We demonstrate that LOFT will be a powerful dark matter detector, suitable
for the search of the X-ray line emission expected from decays of light dark
matter particles in galactic halos. We show that LOFT will have sensitivity for
dark matter line search more than an order of magnitude higher than that of all
existing X-ray telescopes. In this way, LOFT will be able to provide a new
insight into the fundamental problem of the nature of dark matter.Comment: 9 pages, 8 figure
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