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THE 2 Ms CHANDRA DEEP FIELD-NORTH SURVEY AND THE 250 Ks EXTENDED CHANDRA DEEP FIELD-SOUTH SURVEY: IMPROVED POINT-SOURCE CATALOGS

2016; Institute of Physics; Volume: 224; Issue: 2 Linguagem: Inglês

10.3847/0067-0049/224/2/15

1538-4365

Yongquan Xue, Bin Luo, W. N. Brandt, D. M. Alexander, F. E. Bauer, B. D. Lehmer, Guang Yang,

Adaptive optics and wavefront sensing

ABSTRACT We present improved point-source catalogs for the 2 Ms Chandra Deep Field-North (CDF-N) and the 250 ks Extended Chandra Deep Field-South (E-CDF-S) Surveys, implementing a number of recent improvements in Chandra source-cataloging methodology. For CDF-N/E-CDF-S, we provide a main catalog that contains 683/1003 X-ray sources detected with wavdetect at a false-positive probability threshold of 10 −5 that also satisfy a binomial-probability source-selection criterion of <?CDATA $P\lt 0.004$?> / P < 0.002. Such an approach maximizes the number of reliable sources detected: a total of 196/275 main-catalog sources are new compared to the Alexander et al. CDF-N/Lehmer et al. E-CDF-S main catalogs. We also provide CDF-N/E-CDF-S supplementary catalogs that consist of 72/56 sources detected at the same wavdetect threshold and having P of 0.004–0.1/0.002–0.1 and <?CDATA ${K}_{s}\leqslant 22.9/{K}_{s}\leqslant 22.3$?> mag counterparts. For all <?CDATA $\approx 1800$?> CDF-N and E-CDF-S sources, including the <?CDATA $\approx 500$?> newly detected ones (these being generally fainter and more obscured), we determine X-ray source positions utilizing centroid and matched-filter techniques; we also provide multiwavelength identifications, apparent magnitudes of counterparts, spectroscopic and/or photometric redshifts, basic source classifications, and estimates of observed active galactic nucleus and galaxy source densities around respective field centers. Simulations show that both the CDF-N and E-CDF-S main catalogs are highly reliable and reasonably complete. Background and sensitivity analyses indicate that the on-axis mean flux limits reached represent a factor of <?CDATA $\approx 1.5$?> –2.0 improvement over the previous CDF-N and E-CDF-S limits. We make our data products publicly available.