The metal contents of two groups of galaxies | Astronomy & Astrophysics (A&A)

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Table 8

Literature values of the parameters for NGC 5813.

Parameter	W09	R11	R11	This work

Instrument	RGS	RGS	ACIS^a	RGS & EPIC
r _extr	0.25′^b	0.5′^b	2.9′	2.5′^b & 3′
Plasma code	CIE^c	2 * CIE^d	2 * APEC	gdem
kT	0.645(8)	> 0.4	0.671(11)	0.665(2)
		< 0.4	0.35(3)
N/Fe	2.6(1.1)	–	–	1.8(3)
O/Fe	0.71(15)	0.80(14)	0.27(6)	0.73(4)
Ne/Fe	0.4(3)	0.72(12)	1.14(12)	0.58(10)
Mg/Fe	–	–	0.83(7)	0.86(6)
Si/Fe	–	–	0.95(7)	0.94(2)
S/Fe	–	–	1.17(12)	1.13(5)
Fe	0.75(9)	0.81(8)	0.71(4)	0.538(17)

Notes. W09: Werner et al. (2009), R11: Randall et al. (2011). Abundance ratios in proto-solar units by Lodders (2003).

^(a)

On board of the Chandra satellite.

^(b)

Half width of the region in cross-dispersion direction used for the analysis.

^(c)

Model including four Gaussian components to correct for possibly present microturbulence effects.

^(d)

Spectra were fitted using two CIE cooling flow models.

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