7.1 keV sterile neutrino dark matter constraints from a deep Chandra X-ray observation of the Galactic bulge Limiting Window

被引：23

作者：

Hofmann, F. ^{[1
]}

Wegg, C. ^{[1
,2
]}

机构：

[1] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany

[2] Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Nice, France

来源：

ASTRONOMY & ASTROPHYSICS | 2019年 / 625卷

基金：

欧盟地平线“2020”;

关键词：

Galaxy: bulge; dark matter; GALAXY; ORIGIN; MILKY;

D O I：

10.1051/0004-6361/201935561

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. An unidentified emission line at 3.55 keV was recently detected in X-ray spectra of clusters of galaxies. The line has been discussed as a possible decay signature of 7.1 keV sterile neutrinos, which have been proposed as a dark matter (DM) candidate. Aims. We aim to further constrain the line strength and its implied mixing angle under the assumption that all DM is made of sterile neutrinos. Methods. The X-ray observations of the Limiting Window (LW) towards the Galactic bulge (GB) offer a unique dataset for exploring DM lines. We characterise the systematic uncertainties of the observation and the fitted models with simulated X-ray spectra. In addition, we discuss uncertainties of indirect DM column density constraints towards the GB to understand systematic uncertainties in the assumed DM mass in the field of view of the observation. Results. We find tight constraints on the allowed flux for an additional line at 3.55 keV with a positive (similar to 1.5 sigma) best fit value F-X(3.55keV) approximate to (4.5 +/- 3.5) x 10(-7) cts cm(-2) s(-1). This would translate into a mixing angle of sin(2)(2 Theta) approximate to (2.3 +/- 1.8) x 10(-11) which, while consistent with some recent results, is in tension with earlier detections. Conclusions. We used a very deep dataset with well understood systematic uncertainties to derive tight constraints on the mixing angle of a 7.1 keV sterile neutrino DM candidate. The results highlight that the inner Milky Way will be a good target for DM searches with upcoming missions like eROSITA, XRISM, and ATHENA.

引用

页数：5

共 48 条

[1] Direct detection of warm dark matter in the X-ray [J].

Abazajian, K ;

Fuller, GM ;

Tucker, WH .

ASTROPHYSICAL JOURNAL, 2001, 562 (02) :593-604

[2] Sterile neutrinos in cosmology [J].

Abazajian, Kevork N. .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2017, 711 :1-28

[3] A White Paper on keV sterile neutrino Dark Matter [J].

Adhikari, R. ;

Agostini, M. ;

Ky, N. Anh ;

Araki, T. ;

Archidiacono, M. ;

Bahr, M. ;

Baur, J. ;

Behrens, J. ;

Bezrukov, F. ;

Dev, P. S. Bhupal ;

Borah, D. ;

Boyarsky, A. ;

de Gouvea, A. ;

Pires, C. A. de S. ;

de Vega, H. J. ;

Dias, A. G. ;

Di Bari, P. ;

Djurcic, Z. ;

Dolde, K. ;

Dorrer, H. ;

Durero, M. ;

Dragoun, O. ;

Drewes, M. ;

Drexlin, G. ;

Duellmann, Ch. E. ;

Eberhardt, K. ;

Eliseev, S. ;

Enss, C. ;

Evans, N. W. ;

Faessler, A. ;

Filianin, P. ;

Fischer, V. ;

Fleischmann, A. ;

Formaggio, J. A. ;

Franse, J. ;

Fraenkle, F. M. ;

Frenk, C. S. ;

Fuller, G. ;

Gastaldo, L. ;

Garzilli, A. ;

Giunti, C. ;

Glueck, F. ;

Goodman, M. C. ;

Gonzalez-Garcia, M. C. ;

Gorbunov, D. ;

Hamann, J. ;

Hannen, V. ;

Hannestad, S. ;

Hansen, S. H. ;

Hassel, C. .

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2017, (01)

[4] Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster [J].

Aharonian, F. A. ;

Akamatsu, H. ;

Akimoto, F. ;

Allen, S. W. ;

Angelini, L. ;

Arnaud, K. A. ;

Audard, M. ;

Awaki, H. ;

Axelsson, M. ;

Bamba, A. ;

Bautz, M. W. ;

Blandford, R. D. ;

Bulbul, E. ;

Brenneman, L. W. ;

Brown, G. V. ;

Cackett, E. M. ;

Chernyakova, M. ;

Chiao, M. P. ;

Coppi, P. ;

Costantini, E. ;

de Plaa, J. ;

den Herder, J. -W. ;

Done, C. ;

Dotani, T. ;

Ebisawa, K. ;

Eckart, M. E. ;

Enoto, T. ;

Ezoe, Y. ;

Fabian, A. C. ;

Ferrigno, C. ;

Foster, A. R. ;

Fujimoto, R. ;

Fukazawa, Y. ;

Furuzawa, A. ;

Galeazzi, M. ;

Gallo, L. C. ;

Gandhi, P. ;

Giustini, M. ;

Goldwurm, A. ;

Gu, L. ;

Guainazzi, M. ;

Haba, Y. ;

Hagino, K. ;

Hamaguchi, K. ;

Harrus, I. ;

Hatsukade, I. ;

Hayashi, K. ;

Hayashi, T. ;

Hayashida, K. ;

Hiraga, J. .

ASTROPHYSICAL JOURNAL LETTERS, 2017, 837 (01)

[5] Atomic data and spectral modeling constraints from high-resolution X-ray observations of the Perseus cluster with Hitomi [J].

Aharonian, Felix ;

Akamatsu, Hiroki ;

Akimoto, Fumie ;

Allen, Steven W. ;

Angelini, Lorella ;

Audard, Marc ;

Awaki, Hisamitsu ;

Axelsson, Magnus ;

Bamba, Aya ;

Bautz, Marshall W. ;

Blandford, Roger ;

Brenneman, Laura W. ;

Brown, Gregory, V ;

Bulbul, Esra ;

Cackett, Edward M. ;

Chernyakova, Maria ;

Chiao, Meng P. ;

Coppi, Paolo S. ;

Costantini, Elisa ;

de Plaa, Jelle ;

de Vries, Cor P. ;

den Herder, Jan-Willem ;

Done, Chris ;

Dotani, Tadayasu ;

Ebisawa, Ken ;

Eckart, Megan E. ;

Enoto, Teruaki ;

Ezoe, Yuichiro ;

Fabian, Andrew C. ;

Ferrigno, Carlo ;

Foster, Adam R. ;

Fujimoto, Ryuichi ;

Fukazawa, Yasushi ;

Furuzawa, Akihiro ;

Galeazzi, Massimiliano ;

Gallo, Luigi C. ;

Gandhi, Poshak ;

Giustini, Margherita ;

Goldwurm, Andrea ;

Gu, Liyi ;

Guainazzi, Matteo ;

Haba, Yoshito ;

Hagino, Kouichi ;

Hamaguchi, Kenji ;

Harrus, Ilana M. ;

Hatsukade, Isamu ;

Hayashi, Katsuhiro ;

Hayashi, Takayuki ;

Hayashida, Kiyoshi ;

Hell, Natalie .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2018, 70 (02)

[6] ABUNDANCES OF THE ELEMENTS - METEORITIC AND SOLAR [J].

ANDERS, E ;

GREVESSE, N .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1989, 53 (01) :197-214

[7] Non-detection of X-ray emission from sterile neutrinos in stacked galaxy spectra [J].

Anderson, Michael E. ;

Churazov, Eugene ;

Bregman, Joel N. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 452 (04) :3905-3923

[8]

[Anonymous], 2013, ARXIV13062307

[9]

[Anonymous], 2012, erosita science book: Mapping the structure of the energetic universe

[10] The Galaxy in Context: Structural, Kinematic, and Integrated Properties [J].

Bland-Hawthorn, Joss ;

Gerhard, Ortwin .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 54, 2016, 54 :529-+

← 1 2 3 4 5 →