We present improved point-source catalogs for the 2 Ms Chandra Deep Field-North ( CDF-N ) that covers an area of 447.5 arcmin ^ { 2 } and the 250 ks Extended Chandra Deep Field-South ( E-CDF-S ) that covers an area of 1128.6 arcmin ^ { 2 } , implementing a number of recent improvements in Chandra source-cataloging methodology .
For the CDF-N , we provide a main catalog that contains 683 X-ray sources detected with wavdetect at a false-positive probability threshold of 10 ^ { -5 } in at least one of three standard X-ray bands ( 0.5–7 keV , full band ; 0.5–2 keV , soft band ; and 2–7 keV , hard band ) that also satisfy a binomial-probability source-selection criterion of P < 0.004 .
Such an approach maximizes the number of reliable sources detected : a total of 196 CDF-N main-catalog sources are new compared to the Alexander et al .
( 2003 ) 2 Ms CDF-N main catalog .
We also provide a CDF-N supplementary catalog that consists of 72 sources detected at the same wavdetect threshold and having 0.004 < P < 0.1 and K _ { s } \leq 22.9 mag counterparts .
For the E-CDF-S , we provide likewise a main catalog containing 1003 sources and a supplementary catalog consisting of 56 sources , with the only differences lying in the corresponding adopted threshold values of P < 0.002 and K _ { s } \leq 22.3 mag .
A total of 275 E-CDF-S main-catalog sources are new compared to the Lehmer et al .
( 2005 ) E-CDF-S main catalog .
For all \approx 1800 CDF-N and E-CDF-S sources , including the \approx 500 newly detected ones ( these being generally fainter and more obscured ) , we determine X-ray source positions utilizing centroid and matched-filter techniques and achieve median positional uncertainties of 0 \farcs 47 for CDF-N and 0 \farcs 63 for E-CDF-S. We provide multiwavelength identifications ( with a 98.1 % identification rate for CDF-N and 95.5 % for E-CDF-S ) , apparent magnitudes of counterparts , and spectroscopic and/or photometric redshifts ( with a 95.2 % redshift success rate for CDF-N and 84.6 % for E-CDF-S ) .
Finally , by analyzing X-ray and multiwavelength properties of the sources , we find that 86.5 % /90.6 % of the CDF-N/E-CDF-S main-catalog sources are likely AGNs and the galaxy fraction among the new CDF-N/E-CDF-S main-catalog sources is larger than that among the corresponding old sources , reflecting the rise of normal and starburst galaxies when probing fainter fluxes .
In the areas within respective off-axis angles of 3 \arcmin of the CDF-N average aim point and the four E-CDF-S aim points , the observed AGN and galaxy source densities reach 12400 _ { -1300 } ^ { +1400 } deg ^ { -2 } and 4200 _ { -700 } ^ { +900 } deg ^ { -2 } for CDF-N , and 5200 _ { -800 } ^ { +1000 } deg ^ { -2 } and 500 _ { -200 } ^ { +400 } deg ^ { -2 } for E-CDF-S , respectively .
Simulations show that both the CDF-N and E-CDF-S main catalogs are highly reliable and reasonably complete .
The mean soft- and hard-band backgrounds are 0.055 and 0.108 count Ms ^ { -1 } pixel ^ { -1 } for CDF-N , and 0.048 and 0.109 count Ms ^ { -1 } pixel ^ { -1 } for E-CDF-S , respectively ; \mathrel { \hbox to 0.0 pt { \lower 4.0 pt \hbox { $ \sim$ } } \raise 1.0 pt \hbox { $ > $ } } 92 % / \mathrel { \hbox to 0.0 pt { \lower 4.0 pt \hbox { $ \sim$ } } \raise 1.0 pt \hbox { $ > $ } } 97 % of the pixels have zero background counts in any of the three standard bands for CDF-N/E-CDF-S .
The soft- and hard-band on-axis mean flux limits reached are \approx 1.2 \times 10 ^ { -17 } and 5.9 \times 10 ^ { -17 } erg cm ^ { -2 } s ^ { -1 } for the 2 Ms CDF-N ( i.e. , a factor of \approx 2 improvement over the previous CDF-N limits ) , and \approx 7.6 \times 10 ^ { -17 } and 3.0 \times 10 ^ { -16 } erg cm ^ { -2 } s ^ { -1 } for the 250 ks E-CDF-S ( i.e. , a factor of \approx 1.5 –2.0 improvement over the previous E-CDF-S limits ) , respectively .
We make our data products publicly available .