The NuSTAR extragalactic surveys: Initial results and catalog from the extended Chandra Deep Field South

Journal Article · Sat Aug 01 04:00:00 EDT 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/808/2/184· OSTI ID:22882851

Mullaney, J. R.; Del-Moro, A.; Aird, J.; Alexander, D. M.; Lansbury, G. B. ^[1]; Civano, F. M. ^[2]; Hickox, R. C. ^[3]; Ajello, M.; Boggs, S. E.; Craig, W. W. ^[4]; Assef, R. ^[5]; Ballantyne, D. R. ^[6]; Balokovic, M.; Brightman, M.; Forster, K. ^[7]; Bauer, F. E. ^[8]; Brandt, W. N. ^[9]; Christensen, F. E. ^[10]; Comastri, A. ^[11]; Elvis, M. ^[12] ; others, and

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1. Centre of Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham DH1 3LE (United Kingdom)
2. Yale Center for Astronomy and Astrophysics, 260 Whitney Avenue, New Haven, CT 06520 (United States)
3. Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, NH 03755 (United States)
4. Space Sciences Laboratory, 7 Gauss Way, University of California, Berkeley, CA 94720-7450 (United States)
5. Núcleo de Astronomía de la Facultad de Ingeniería, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago (Chile)
6. Center for Relativistic Astrophysics, School of Physics, Georgia Institute of Technology, Atlanta, GA 30332 (United States)
7. Cahill Center for Astrophysics, 1216 E. California Boulevard, California Institute of Technology, Pasadena, CA 91125 (United States)
8. Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, 306, Santiago 22 (Chile)
9. Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802 (United States)
10. DTU Space, National Space Institute, Technical University of Denmark, Elektrovej 327, DK-2800 Lyngby (Denmark)
11. INAF Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127, Bologna (Italy)
12. Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

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{sup −14} erg s{sup −1} cm{sup −2} (3–8 keV), ≈3.4×10{sup −14} erg s{sup −1} cm{sup −2} (8–24 keV), and ≈3.0×10{sup −14} erg s{sup −1} cm{sup −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 Γ≈0.5−2.3, with a median photon index of Γ-bar =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{sub 10−40 keV}≈(0.7−300)×10{sup 43} erg s{sup −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.

• OSTI ID: 22882851
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 808; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United Kingdom
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CATALOGS
GALACTIC EVOLUTION
LUMINOSITY
PHOTONS
RED SHIFT
TELESCOPES
X-RAY GALAXIES