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EXTRAGALACTIC X-RAY SOURCE COUNTS
Pages 336-343

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From page 336...
... Only one complete optical sample of Seyfert gal~es, based on the CfA redshift suney, is available. Counts of extragalactic x-ray sources promise lo play an important role in studying evolution.
From page 337...
... On the basis of the luminosity functions developed, we present an x-ray source count prognosis for the AXAF energy range 05 - 10 keV. DERIVATION OF LUMINOSllY FUNCTION Consider an x-ray sample that is complete over a given area of sky to a limiting 0= Slim in a given energy band.
From page 338...
... , in erg/sec. At the lowest luminosity illustrated, log HX = 41, the counts follow the-3/2 law expected in Euclidean space for fluxes larger than log S(2-10 keV)
From page 339...
... detailed comparison of their content is of interest. In malting the comparison, we generally use the sample with the larger number of objects of a given class to predict the expected number in the other sample, following the procedure described in the preceding sections.
From page 340...
... Further study shows that there is only a discrepancy at the bright end: based on the A-2 sample, we expect 25 clusters with log HX > 44.4 in the MSS, but none are observed. Part of He explanation is probably that
From page 341...
... SOURCE COUNT PROGNOSIS We have derived a source count prognosis for the AXAF energy range 0.5-10 keV, based on the evaluation of the HEAO1 A-2 and Enstein MSS samples, discussed in the preceding section. The x-ray counts for the different classes of objects are shown in Figure 2.
From page 342...
... i' ';/Wk Cl <; '' .4 11 _r Cl BLLac J 13 109 S(0.5 - 1 OkeV) 15 FIGURE 2 Source count prognosis for the AXAF energy band 0.5-10 keV.
From page 343...
... 1983. The Einstein Observatory medium sensitivity surrey: Optical identifications for a complete sample of x-ray sources.


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