Observational consistency and future predictions for a 3.5 keV ALP to photon line

被引：15

作者：

Alvarez, Pedro D. ^{[1
]}

Conlon, Joseph P. ^{[1
]}

Day, Francesca V. ^{[1
]}

Marsh, M. C. David ^{[1
]}

Rummel, Markus ^{[1
]}

机构：

[1] Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3NP, England

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2015年 / 04期

关键词：

dark matter theory; axions; galactic magnetic fields; X-rays; X-RAY-LINE; MAGNETIC-FIELD; DARK-MATTER; INTERSTELLAR GAS; EMISSION; REGION; GALAXY; MODEL;

D O I：

10.1088/1475-7516/2015/04/013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Motivated by the possibility of explaining the 3.5 keV line through dark matter decaying to axion-like particles that subsequently convert to photons, we study ALP-photon conversion for sightlines passing within 50 pc of the galactic centre. Conversion depends on the galactic centre magnetic field which is highly uncertain. For fields at low or mid-range of observational estimates (10-100 mu G), no observable signal is possible. For fields at the high range of observational estimates (a pervasive poloidal mG field over the central 150 pc) it is possible to generate sufficient signal to explain recent observations of a 3.5 keV line in the galactic centre. In this scenario, the galactic centre line signal comes predominantly from the region with z > 20 pc, reconciling the results from the Chandra and XMM-Newton X-ray telescopes. The dark matter to ALP to photon scenario also naturally predicts the non-observation of the 3.5 keV line in stacked galaxy spectra. We further explore predictions for the line flux in galaxies and suggest a set of galaxies that is optimised for observing the 3.5 keV line in this model.

引用

页数：30

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