7.1 keV sterile neutrino constraints from X-ray observations of 33 clusters of galaxies with Chandra ACIS

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Table 1

Limits from merged spectra.

Merged spec.	F _X ^a	sin²(2Θ) ^b	⟨ n_H ⟩ ^c	⟨ z ⟩ ^c	^c	^c
	[10^-6 cm^-2 s^-1]	[10^-11]	[10²² cm^-2]		[10¹⁴M_⊙]	[10¹⁰M_⊙ Mpc^-2]

Mergei			0.06	0.11	2.08	0.197
Merges			0.10	0.07	1.26	0.172

Notes.

^(a)

Best fit and 3σ confidence range of a possible additional flux added by a Gaussian line at 3.55 keV.

^(b)

Mixing-angle limits (3σ confidence) for the 7.1 keV sterile neutrino decay scenario (negative mixing-angle unphysical results from allowing negative flux).

^(c)

Weighted average properties of the cluster sample weighting contributions as described in Eq. (2) in Sect. 6.2.

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