2.3.4 Source Count Rates

Table 4 shows measured HRI count rates for a sample of sources and compares these rates to that of the PSPC and the Einstein Observatory HRI and IPC.

  

Table 4: X-ray Count rates (counts s^-1) for different instruments

	Object	ROSAT	Einstein	ROSAT	Einstein
		HRI	HRI	PSPC	IPC
	HZ43	12.0	3.6	100	3.8
v	AR Lac	0.65	0.69	7.4	1.3
v	Cyg X-2	72	27.8	180	NA
v	LMC X-1	3.8	1.3	10	10.55
v	LMC X-3	2.6	2.7	NA	NA
	Cas A	17	6.3	57	61
	Tycho	10.2	3.4	NA	22.3
	Kepler	5.4	1.7	NA	7.3
	E0102.2-72.2	0.96	0.25	NA	0.79
	(SMC SNR)
	N132D	4.5	1.1	10.6	4.0
	A2256	0.62	NA	1.7	0.34

Notes: v - variable source, the count rate for A2256 is determined from the net emission within a 6' radius.