THE EXTENDED CHANDRA DEEP FIELD-SOUTH SURVEY: OPTICAL SPECTROSCOPY OF FAINT X-RAY SOURCES WITH THE VLT AND KECK

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/191/1/124· OSTI ID:21454932

Silverman, J D ^[1]; Mainieri, V; Rosati, P ^[2]; Salvato, M; Hasinger, G ^[3]; Bergeron, J ^[4]; Capak, P ^[5]; Szokoly, G ^[6]; Finoguenov, A; Balestra, I ^[7]; Gilli, R ^[8]; Tozzi, P ^[9]; Vignali, C ^[10]; Alexander, D M ^[11]; Brandt, W N; Luo, B; Rafferty, D; Xue, Y Q ^[12]; Lehmer, B D ^[13]; Bauer, F E ^[14]

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1. Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, Kashiwanoha 5-1-5, Kashiwa-shi, Chiba 277-8568 (Japan)
2. European Southern Observatory, Karl-Schwarzschild-Strasse 2, Garching D-85748 (Germany)
3. Max-Planck-Institute for Plasma Physics, Boltzmannstrass 2, Garching D-85748 (Germany)
4. Institut d'Astrophysique de Paris, 98bis Boulevard, F-75014 Paris (France)
5. California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
6. Eoetvoes University, Institute of Physics, 1117 Budapest, Pazmany P. s. 1/A (Hungary)
7. Max-Planck-Institut fuer extraterrestrische Physik, D-84571 Garching (Germany)
8. Instituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna (Italy)
9. INAF, Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34131 Trieste (Italy)
10. Dipartimento di Astronomia, Universita degli Studi di Bologna, Via Ranzani 1, 40127 Bologna (Italy)
11. Department of Physics, University of Durham, South Road, Durham, DH1 3LE (United Kingdom)
12. Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802 (United States)
13. Johns Hopkins University, Homewood Campus, Baltimore, MD 21218 (United States)
14. Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301 (United States)

We present the results of a program to acquire high-quality optical spectra of X-ray sources detected in the Extended-Chandra Deep Field-South (E-CDF-S) and its central 2 Ms area. New spectroscopic redshifts, up to z = 4, are measured for 283 counterparts to Chandra sources with deep exposures (t {approx} 2-9 hr per pointing) using multi-slit facilities on both VLT (VIMOS) and Keck (DEIMOS), thus bringing the total number of spectroscopically identified X-ray sources to over 500 in this survey field. Since our new spectroscopic identifications are mainly associated with X-ray sources in the shallower 250 ks coverage, we provide a comprehensive catalog of X-ray sources detected in the E-CDF-S including the optical and near-infrared counterparts, determined by a likelihood routine, and redshifts (both spectroscopic and photometric), that incorporate published spectroscopic catalogs, thus resulting in a final sample with a high fraction (80%) of X-ray sources having secure identifications. We demonstrate the remarkable coverage of the luminosity-redshift plane now accessible from our data while emphasizing the detection of active galactic nuclei (AGNs) that contribute to the faint end of the luminosity function (L {sub 0.5-8keV} {approx} 10{sup 43}-10{sup 44} erg s{sup -1}) at 1.5 {approx}< z {approx}< 3 including those with and without broad emission lines. Our redshift catalog includes 17 type-2 QSOs at 1 {approx}< z {approx}< 3.5 that significantly increases such samples (2x). Based on our deepest (9 hr) VLT/VIMOS observation, we identify 'elusive' optically faint galaxies (R {sub mag} {approx} 25) at z {approx} 2-3 based upon the detection of interstellar absorption lines (e.g., O II+Si IV, C II], C IV); we highlight one such case, an absorption-line galaxy at z = 3.208 having no obvious signs of an AGN in its optical spectrum. In addition, we determine accurate distances to eight galaxy groups with extended X-ray emission detected both by Chandra and XMM-Newton. Finally, we measure the physical extent of known large-scale structures (z {approx} 0.7) evident in the CDF-S. While a thick sheet (a radial size of 67.7 Mpc) at z {approx} 0.67 extends over the full field, the z {approx} 0.73 structure is thin (18.8 Mpc) and filamentary as traced by both AGNs and galaxy groups. In the Appendix, we provide spectroscopic redshifts for 49 counterparts to fainter X-ray sources detected only in the 1 and 2 Ms catalogs, and 48 Very Large Array radio sources not detected in X-rays.

• OSTI ID: 21454932
• Journal Information: Astrophysical Journal, Supplement Series, Vol. 191, Issue 1; Other Information: DOI: 10.1088/0067-0049/191/1/124; ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABSORPTION
CATALOGS
EMISSION
GALAXY NUCLEI
LUMINOSITY
QUASARS
RED SHIFT
SPECTROSCOPY
X-RAY GALAXIES
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
DOCUMENT TYPES
GALAXIES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SORPTION