Constraints on the presence of a 3.5 keV dark matter emission line from Chandra observations of the Galactic centre

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Table 2

Line free base model and instrumental lines.


Line-free model			Instrumental lines
Parameter	Best fit broad	Best fit narrow	Energy [keV]	Width [keV]


Wabs nH [ cm^-2 ] (frozen)	6 × 10²²	6 × 10²²	1.12^a	1.36
Apec kT[ keV ]			1.49^a (Al K-α)	0.492
Apec Abundance [solar] (frozen)	0	0	1.81^a (Si K-α)	0.492
Apec redshift (frozen)	0	0	2.15^a (Au M-αβ)	unresolved
Apec norm [ 10^-2 cm^-5 ]			5.90^a	0.636
Power law PhoIndex			7.48^a	unresolved
Power law norm [ 10^-3 keV^-1 cm^-2 s^-1 ]			8.31^a	0.071
			9.71 (Au L-α)	1.23

Notes.

^(a)

Lines removed in the narrow interval model.

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