Searches for 3.5 keV Absorption Features in Cluster AGN Spectra

Abstract

We investigate possible evidence for a spectral dip around 3.5 keV in central cluster AGNs, motivated by previous results for archival Chandra observations of the Perseus cluster and the general interest in novel spectral features around 3.5 keV that may arise from dark matter physics. We use two deep Chandra observations of the Perseus and Virgo clusters that have recently been made public. In both cases, mild improvements in the fit ($\Delta {\chi }^2=4.2$ and $\Delta {\chi }^2=2.5$) are found by including such a dip at 3.5 keV into the spectrum. A comparable result ($\Delta {\chi }^2=6.5$) is found re-analysing archival on-axis Chandra ACIS-S observations of the centre of the Perseus cluster.

5 pages

References in corpus (9)

• Discovery of a 3.5 keV line in the Galactic Center and a Critical Look at the Origin of the Line Across Astronomical Targets
• A New Bound on Axion-Like Particles
• Hitomi constraints on the 3.5 keV line in the Perseus galaxy cluster
• Searching for the 3.5 keV Line in the Deep Fields with Chandra: the 10 Ms observations
• Where do the 3.5 keV photons come from? A morphological study of the Galactic Center and of Perseus
• An X-ray Spectroscopic Search for Dark Matter in the Perseus Cluster with Suzaku
• Constraints on Axion-Like Particles from Non-Observation of Spectral Modulations for X-ray Point Sources
• Chandra Imaging of the Outer Accretion Flow onto the Black Hole at the Center of the Perseus Cluster
• Detecting Fluorescent Dark Matter with X-ray lasers

Cited by in corpus (1)

• Axion-like Particles Implications for High-Energy Astrophysics