SIMBAD references

We obtained a 5 ks deep Chandra X-ray Observatory ACIS-I map of the 9.3 deg² Bootes field of the NOAO Deep Wide-Field Survey. Here we describe the data acquisition and analysis strategies leading to a catalog of 4642 (3293) point sources with 2 or more (4 or more) counts, corresponding to a limiting flux of roughly 4(8)x10^–15 ergs/cm2/s in the 0.5-7 keV band. These Chandra XBootes data are unique in that they constitute the widest contiguous X-ray field yet observed to such a faint flux limit. Because of the extraordinarily low background of the ACIS, we expect only 14% (0.7%) of the sources to be spurious. We also detected 43 extended sources in this survey. The distribution of the point sources among the 126 pointings (ACIS-I has a 16'x16' field of view) is consistent with Poisson fluctuations about the mean of 36.8 sources per pointing. While a smoothed image of the point source distribution is clumpy, there is no statistically significant evidence of large-scale filamentary structure. We do find however, that for θ>1', the angular correlation function of these sources is consistent with previous measurements, following a power law in angle with slope ~-0.7. In a 1.4 deg² sample of the survey, approximately 87% of the sources with 4 or more counts have an optical counterpart to R∼26 mag. As part of a larger program of optical spectroscopy of the NDWFS Bootes area, spectra have been obtained for ∼900 of the X-ray sources, most of which are quasars or active galactic nuclei.