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CONTENTS<br />

3.2.2 The binned log N − log S . . . . . . . . . . . . . . . . . . . 57<br />

3.2.3 The log N − log S model . . . . . . . . . . . . . . . . . . . . 58<br />

3.2.4 Maximum likelihood fit method . . . . . . . . . . . . . . . 59<br />

3.3 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62<br />

3.4 Contribution to the Cosmic X-ray Background . . . . . . . . . . . 72<br />

3.4.1 Contribution from bright sources and stars . . . . . . . . . 72<br />

3.4.2 Total X-ray background intensity . . . . . . . . . . . . . . . 73<br />

3.4.3 Contribution to the CXB in different flux intervals . . . . . 74<br />

3.4.4 Resolved and unresolved components of the CXB . . . . . 77<br />

3.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80<br />

4 Clustering of AXIS and XMS sources 83<br />

4.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83<br />

4.2 Cosmic variance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84<br />

4.3 Angular correlation function of AXIS sources . . . . . . . . . . . . 85<br />

4.3.1 Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85<br />

4.3.2 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87<br />

4.3.3 Poisson statistics test . . . . . . . . . . . . . . . . . . . . . . 92<br />

4.3.4 Angular correlation of a hardness ratio selected sample . . 99<br />

4.3.5 Inversion of Limber’s equation . . . . . . . . . . . . . . . . 99<br />

4.4 Spatial clustering of XMS sources . . . . . . . . . . . . . . . . . . . 105<br />

4.4.1 Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105<br />

4.4.2 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109<br />

4.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111<br />

5 Luminosity function of XMS sources 115<br />

5.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115<br />

5.2 The N H function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117<br />

5.3 Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124<br />

5.3.1 Binned luminosity function . . . . . . . . . . . . . . . . . . 128<br />

xxxvii

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