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The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South

Mullaney, J.R.; Del-Moro, A.; Aird, J.; Alexander, D.M.; Civano, F.M.; Hickox, R.C.; Lansbury, G.B.; Ajello, M.; Assef, R.; Ballantyne, D.R.; Balok\acute, M.; Bauer, F.E.; Brandt, W.N.; Boggs, S.E.; Brightman, M.; Christensen, F.E.; Comastri, A.; Craig, W.W.; Elvis, M.; Forster, K.; Gandhi, P.; Grefenstette, B.W.; Hailey, C.J.; Harrison, F.A.; Koss, M.; LaMassa, S.M.; Luo, B.; Madsen, K.K.; Puccetti, S.; Saez, C.; Stern, D.; Treister, E.; Urry, C.M.; Wik, D.R.; Zappacosta, L.; Zhang, W.

The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South Thumbnail


J.R. Mullaney

A. Del-Moro

J. Aird

F.M. Civano

R.C. Hickox

G.B. Lansbury

M. Ajello

R. Assef

D.R. Ballantyne

M. Balok\acute

F.E. Bauer

W.N. Brandt

S.E. Boggs

M. Brightman

F.E. Christensen

A. Comastri

W.W. Craig

M. Elvis

K. Forster

P. Gandhi

B.W. Grefenstette

C.J. Hailey

F.A. Harrison

M. Koss

S.M. LaMassa

B. Luo

K.K. Madsen

S. Puccetti

C. Saez

D. Stern

E. Treister

C.M. Urry

D.R. Wik

L. Zappacosta

W. Zhang


We present the initial results and the source catalog from the Nuclear Spectroscopic Telescope Array (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′ × 30′ 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 10 erg s cm - -- 14 1 2 (3–8 keV), » ´ 3.4 10 erg s cm - -- 14 1 2 (8–24 keV), and » ´ 3.0 10 erg s cm - -- 14 1 2 (3–24 keV). A total of 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 to 3–8 keV band ratios of the 12 sources that are detected in both bands span the range 0.39–1.7, corresponding to a photon index range of G » - 0.5 2.3, with a median photon index of G =  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 L10 40 keV (0.7 300) 10 erg s »- ´ 43 1 - - , 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.


Mullaney, J., Del-Moro, A., Aird, J., Alexander, D., Civano, F., Hickox, R., …Zhang, W. (2015). The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South. Astrophysical Journal, 808(2),

Journal Article Type Article
Acceptance Date Jun 19, 2015
Online Publication Date Aug 3, 2015
Publication Date Aug 3, 2015
Deposit Date May 31, 2016
Publicly Available Date Jun 22, 2016
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 808
Issue 2
Public URL
Related Public URLs


Published Journal Article (2.1 Mb)

Copyright Statement
© 2015. The American Astronomical Society. All rights reserved.

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