Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Chandra Deep Field-South Survey: 2 Ms Source Catalogs   We present point-source catalogs for the ~2 Ms exposure of the Chandra Deep
Field-South (CDF-S); this is one of the two most-sensitive X-ray surveys ever
performed. The survey covers an area of ~436 arcmin^2 and reaches on-axis
sensitivity limits of ~1.9x10^{-17} and ~1.3x10^{-16} ergs/cm^2/s for the
0.5-2.0 and 2-8 keV bands, respectively. Four hundred and sixty-two X-ray point
sources are detected in at least one of three X-ray bands that were searched;
135 of these sources are new compared to the previous ~1 Ms CDF-S detections.
Source positions are determined using centroid and matched-filter techniques;
the median positional uncertainty is ~0.36". The X-ray-to-optical flux ratios
of the newly detected sources indicate a variety of source types; ~55% of them
appear to be active galactic nuclei while ~45% appear to be starburst and
normal galaxies. In addition to the main Chandra catalog, we provide a
supplementary catalog of 86 X-ray sources in the ~2 Ms CDF-S footprint that was
created by merging the ~250 ks Extended Chandra Deep Field-South with the
CDF-S; this approach provides additional sensitivity in the outer portions of
the CDF-S. A second supplementary catalog that contains 30 X-ray sources was
constructed by matching lower significance X-ray sources to bright optical
counterparts (R<23.8); the majority of these sources appear to be starburst and
normal galaxies. The total number of sources in the main and supplementary
catalogs is 578. R-band optical counterparts and basic optical and infrared
photometry are provided for the X-ray sources in the main and supplementary
catalogs. We also include existing spectroscopic redshifts for 224 of the X-ray
sources. (Abstract abridged)

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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: math
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: supr-con