Hot gas in groups: NGC 5328 and the intriguing case of NGC 4756 with XMM-Newton

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Volume 545 (September 2012)

A&A, 545 (2012) A140

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Table 1

Dynamical analysis of the NGC 4756 and NGC 5328 groups

Object	N.	Center of mass		V_group	σGroup	Dist.⁺	Harmonic	Virial	Projected	Crossing	Group
					vel. disp.		radius	mass	mass	time	L_B
		RA	Dec	[km s^-1]	[km s ^-1]	[Mpc]	[Mpc]	[10¹³M_⊙]	[10¹³M_⊙]	time × H₀	[10¹¹L_⊙]

NGC 4756	26	193.2462	–15.4330	4155.7	445	59.37	0.10	2.26	17.15	0.05	0.89
NGC 4756^†	22	193.2990	–15.4006	4039.61	378	57.71	0.19	2.97	15.49	0.05	0.63
NGC 5328	17	208.1982	–28.4508	4754.88	174	67.93	0.10	0.34	2.23	0.09	1.24

Notes. All parameters are weighted by B-band luminosity using M_B ⊙ = 5.45 mag.

⁽⁺⁾

Distance is derived from V_hel adopting H₀ = 70 km s^-1 Mpc^-1. This gives a scale of 0.302 kpc/″ for NGC 4756 and 0.326 kpc/″ for NGC 5328.

^(†)

The dynamical analysis of NGC 4756 is repeated by excluding the four galaxies in the SW clump (see text).

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