Estimating turbulent velocities in the elliptical galaxies NGC 5044 and NGC 5813

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Table 6

Estimates for the turbulent velocities in NGC 5044 and NGC 5813.

NGC 5044			NGC 5813


M	V_turb^a	Pred.^b	M	V_turb^a	Pred.^b

0.00	0	1.76	0.00	0	2.94
0.25	115	1.53	0.25	104	2.13
0.50	230	1.42	0.50	208	1.75
0.75	345	1.37	0.75	311	1.61
∞	∞	1.27	∞	∞	1.30

Observed		1.25 ± 0.08	Observed		1.87 ± 0.08


Lower Limit		>320 km s^-1	Lower Limit		>140 km s^-1
Upper Limit ^c		<770 km s^-1	Upper Limit ^c		<540 km s^-1

Notes.

^(a)

Equivalent turbulent velocity estimate in km s^-1 using the Mach number and the adiabatic sound speed, which is 460 km s^-1 for NGC 5044 and 415 km s^-1 for NGC 5813.

^(b)

Emission weighted average of the predicted (I_17.05 + I_17.10)/I_15.01 ratio over the RGS extraction region.

^(c)

90% upper limits on the turbulence derived from the line width in RGS.

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