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- Title
An X-ray spectroscopic search for dark matter in the Perseus cluster with Suzaku.
- Authors
Takayuki TAMURA; Ryo IIZUKA; Yoshitomo MAEDA; Kazuhisa MITSUDA; Noriko Y. YAMASAKI
- Abstract
We present the results from deep Suzaku observations of the central region of the Perseus cluster. Bulbul et al. (2014, ApJ, 789, 13) reported the detection by XMM-Newton instruments of an unidentified X-ray emission line at an energy around 3.5 keV in spectra for the Perseus and other clusters. They argued for a possibility of the decay of sterile neutrino, a dark matter candidate. We examine Suzaku X-ray Imaging Spectrometer (XIS) spectra of the Perseus cluster for evidence in the 3.5 keV line and other possible dark matter features in the 2-6 keV energy band. In order to search for and constrain a weak line feature with the XIS, observations of the Crab Nebula are used to evaluate the system's effective area. We found no line feature at the claimed position with a systematic line flux upper limit at a half (1.5 eV in line equivalent width) of the claimed best-fitting value by Bulbul et al. (2014). We discuss this inconsistency in terms of instrumental calibration errors andmodeling of continuum emission. Future prospects for high-energy resolution spectroscopy with ASTRO-H are presented.
- Subjects
DARK matter; X-ray spectroscopy; NATURAL satellites; STERILE neutrinos; GALAXY clusters
- Publication
Publications of the Astronomical Society of Japan, 2015, Vol 67, Issue 2, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psu156