The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South
Abstract
We present initial results and the source catalog from the NuSTAR survey of the Extended Chandra Deep Field South (hereafter, ECDFS) - currently the deepest contiguous component of the NuSTAR extragalactic survey program. The survey covers the full ~30 arcmin x 30 arcmin area of this field to a maximum depth of ~360 ks (~220 ks when corrected for vignetting at 3-24 keV), reaching sensitivity limits of ~1.3 x 10^-14 erg/cm2/s (3-8 keV), ~3.4 x 10^-14 erg/cm2/s (8-24 keV) and ~3.0 x 10^-14 erg/cm2/s (3-24 keV). Fifty four (54) sources are detected over the full field, although five of these are found to lie below our significance threshold once contaminating flux from neighboring (i.e., blended) sources is taken into account. Of the remaining 49 that are significant, 19 are detected in the 8-24 keV band. The 8-24 keV to 3-8 keV band ratios of the twelve sources that are detected in both bands span the range 0.39-1.7, corresponding to a photon index range of Gamma ~ 0.5-2.3, with a median photon index of 1.70 +/- 0.52. The redshifts of the 49 sources in our main sample span the range z = 0.21-2.7, and their rest-frame 10-40 keV luminosities (derived from the observed 8-24 keV fluxes) span the range L(10-40 keV) ~ (0.7-300) x 10^43 erg/s, sampling below the "knee" of the X-ray luminosity function out to z ~ 0.8-1. Finally, we identify one NuSTAR source that has neither a Chandra nor an XMM-Newton counterpart, but that shows evidence of nuclear activity at infrared wavelengths, and thus may represent a genuine, new X-ray source detected by NuSTAR in the ECDFS.
Keywords
Cite
@article{arxiv.1511.04186,
title = {The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South},
author = {J. R. Mullaney and A. Del-Moro and J. Aird and D. M. Alexander and F. M. Civano and R. C. Hickox and G. B. Lansbury and M. Ajello and R. Assef and D. R. Ballantyne and M. Balokovic and F. E. Bauer and W. N. Brandt and S. E. Boggs and M. Brightman and F. E. Christensen and A. Comastri and W. W. Craig and M. Elvis and K. Forster and P. Gandhi and B. W. Grefenstette and C. J. Hailey and F. A. Harrison and M. Koss and S. M. LaMassa and B. Luo and K. K. Madsen and S. Puccetti and C. Saez and D. Stern and E. Treister and C. M. Urry and D. R. Wik and L. Zappacosta and W. Zhang},
journal= {arXiv preprint arXiv:1511.04186},
year = {2015}
}
Comments
20 pages, published in the Astrophysical Journal