Recent Results on the X-ray Survey of the Chandra Deep Field South

Details Recent Results on the X-ray Survey of the Chandra Deep Field South Recent Results on the X-ray Survey of the Chandra Deep Field South

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.0701g&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #07.01; Bulletin of the American Astronomical Society, Vol. 32, p.1193

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results from 300 ks of X-ray observations obtained with the Advanced CCD Imaging Spectrometer on the Chandra X-ray Observatory. We reach a flux of 10-16 erg s-1 cm-2 in the 0.5-2 keV soft band and 10-15 erg s-1 cm-2 in the 2-10 keV hard band. Our combined sample now reaches a total of over 200 sources in ~ 0.1 square degrees with S/N ~ 2. We use the FORS-1 imaging-spectrometer for identifications, supplemented by the information obtained with the ESO Imaging Survey (EIS) and the ESO Wide Field Imager Survey (WFI). Positional accuracy is ~ 1'' in the central 6'. Optical spectra have been obtained for a small fraction of the sample. Cumulative X-ray spectra for sources in the sample divided into broad flux bins show the hardening of the X-ray spectra at fainter fluxes. Hardness ratios for individual sources confirm this result and provide elements for classification. We discuss the LogN-LogS relationship and the discrete source contribution to the integrated X-ray sky flux. >From the U-band and the B-band dropouts we discuss the highest redshift objects in our sample. We compare FX/Fopt of the sources observed in this survey to that of ROSAT and note a number of sources which appear to be galaxies that cluster at low FX/Fopt . The R-K vs R color diagrams show a reddening of the Chandra sources with increasing magnitudes. A few objects have R-K > 6. We compare our findings with previous results and with the predictions of models of the X-ray background. We show that Chandra is obtaining the predicted sensitivity and discuss the potential for even deeper surveys.

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