AEGIS-X: Deep Chandra Imaging of the Central Groth Strip

September 2015 • 2015ApJS..220...10N

Authors • Nandra, K. • Laird, E. S. • Aird, J. A. • Salvato, M. • Georgakakis, A. • Barro, G. • Perez-Gonzalez, P. G. • Barmby, P. • Chary, R. -R. • Coil, A. • Cooper, M. C. • Davis, M. • Dickinson, M. • Faber, S. M. • Fazio, G. G. • Guhathakurta, P. • Gwyn, S. • Hsu, L. -T. • Huang, J. -S. • Ivison, R. J. • Koo, D. C. • Newman, J. A. • Rangel, C. • Yamada, T. • Willmer, C.

Abstract • We present the results of deep Chandra imaging of the central region of the Extended Groth Strip, the AEGIS-X Deep (AEGIS-XD) survey. When combined with previous Chandra observations of a wider area of the strip, AEGIS-X Wide (AEGIS-XW), these provide data to a nominal exposure depth of 800 ks in the three central ACIS-I fields, a region of approximately 0.29 deg². This is currently the third deepest X-ray survey in existence; a factor ∼ 2-3 shallower than the Chandra Deep Fields (CDFs), but over an area ∼3 times greater than each CDF. We present a catalog of 937 point sources detected in the deep Chandra observations, along with identifications of our X-ray sources from deep ground-based, Spitzer, GALEX, and Hubble Space Telescope imaging. Using a likelihood ratio analysis, we associate multiband counterparts for 929/937 of our X-ray sources, with an estimated 95% reliability, making the identification completeness approximately 94% in a statistical sense. Reliable spectroscopic redshifts for 353 of our X-ray sources are available predominantly from Keck (DEEP2/3) and MMT Hectospec, so the current spectroscopic completeness is ∼38%. For the remainder of the X-ray sources, we compute photometric redshifts based on multiband photometry in up to 35 bands from the UV to mid-IR. Particular attention is given to the fact that the vast majority the X-ray sources are active galactic nuclei and require hybrid templates. Our photometric redshifts have mean accuracy of σ =0.04 and an outlier fraction of approximately 5%, reaching σ =0.03 with less than 4% outliers in the area covered by CANDELS . The X-ray, multiwavelength photometry, and redshift catalogs are made publicly available.

Links

• PREPRINT http://arxiv.org/abs/1503.09078
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/2015ApJS..220...10N
• ELECTR https://doi.org/10.1088%2F0067-0049%2F220%2F1%2F10
• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2015ApJS..220...10N
• PDF https://iopscience.iop.org/article/10.1088/0067-0049/220/1/10/pdf
• PDF https://stacks.iop.org/0067-0049/220/10/pdf
• DATA http://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/220/10
• DATA https://archive.stsci.edu/mastbibref.php?bibcode=2015ApJS..220...10N
• DATA https://cda.harvard.edu/chaser?obsid=3305,4357,4365,5845,5846,5847,5848,5849,5850,6214,6215,6216,6217,6218,6219,9450,9451,9452,9453,9454,9455,9456,9457,9458,9459,9460,9461,9720,9721,9722,9723,9724,9725,9726,9727,9729,9730,9731,9733,9734,9735,9736,9737,9738,9739,9740,9793,9794,9795,9796,9797,9842,9843,9844,9863,9866,9870,9873,9875,9876,9878,9879,9880,9881,10769,10847,10848,10849,10876,10877,10896,10923
• DATA https://hst.esac.esa.int/ehst/#/pages/search;bibcode=2015ApJS..220...10N
• DATA https://irsa.ipac.caltech.edu/bibdata/2015/N/2015ApJS..220...10N.html