The diverse X-ray properties of four truly isolated elliptical galaxies: NGC 2954, NGC 6172, NGC 7052, and NGC 7785

E. Memola; G. Trinchieri; A. Wolter; P. Focardi; B. Kelm

doi:10.1051/0004-6361/200810801

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Volume 497 / No 2 (April II 2009)

A&A, 497 2 (2009) 359-370

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Table 2:

Observation log.
Source	Obs. Date	ks^*	cts/s (0.5-5.0 keV)	$r_{\rm ext}$	Filter	Instrument
NGC 2954	2004 11 03	29.4/30.3/19.5	( $1.42 \pm 0.37$ / $1.58 \pm 0.36$ / $6.21\pm 0.87$ ) $\times 10^{-3}$	30 $^{\prime\prime}$	Medium	MOS1/MOS2/pn
NGC 7785	2004 06 14	22.0/23.0/14.6	( $4.73\pm 0.25/4.59\pm 0.23$ / $19.7 \pm 0.53$ ) $\times 10^{-2}$	120 $^{\prime\prime}$	Thin	MOS1/MOS2/pn
NGC 7052	2002 09 21	9.63	( $7.38 \pm 0.31$ ) $\times 10^{-2}$	50 $^{\prime\prime}$	-	ACIS-S
NGC 6172	1999 02 15	57.2/52.1	-	90 $^{\prime\prime}$	-	GIS/SIS

^* Live time of the central CCD after cleaning from high background flaring events (see text).

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