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J/AJ/131/1216     Faint radio sources in the CDF-S ACS field     (Afonso+, 2006)

Optical and X-ray identification of faint radio sources in the GOODS CDF-S Advanced Camera for Surveys field. Afonso J., Mobasher B., Koekemoer A., Norris R.P., Cram L. <Astron. J., 131, 1216-1230 (2006)> =2006AJ....131.1216A
ADC_Keywords: Active gal. nuclei ; Radio sources ; X-ray sources ; Photometry Keywords: galaxies: active - galaxies: evolution - galaxies: starburst - radio continuum: galaxies Abstract: We present optical and X-ray identifications for the 64 radio sources in the Great Observatories Origins Deep Survey (GOODS) in Chandra Deep Field-South Advanced Camera for Surveys (ACS) field revealed in the Australia Telescope Compact Array 1.4GHz survey of the Chandra Deep Field-South. Optical identifications are made using the ACS images and catalogs, while the X-ray view is provided by the Chandra X-Ray Observatory 1Ms observations. Redshifts for the identified sources are drawn from publicly available catalogs of spectroscopic observations and multiband photometric-based estimates. Using this multiwavelength information we provide a first characterization of the faint radio source population in this region. Description: The CDF-S was observed at radio (1.4GHz) wavelengths using the Australia Telescope Compact Array (ATCA). A total of 120hr of observations were obtained, resulting in a 1.2°2 area field, covering the CDF-S to a limiting (1σ) sensitivity of ∼14µJy with a beam size of 16.8"x6.9". File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 127 72 Identification of faint radio sources table2.dat 118 72 Characterization of faint radio sources
See also: II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2004) II/261 : GOODS initial results (Giavalisco+, 2004) J/ApJS/139/369 : Chandra Deep Field South. 1 Ms catalog (Giacconi+, 2002) J/ApJS/155/271 : Chandra Deep Field-South: Optical spectroscopy (Szokoly+, 2004) J/A+A/434/53 : GOODS-South Field redshifts (Vanzella+, 2005) J/A+A/428/1043 : Redshifts from VIMOS VLT Deep Survey (Le Fevre+, 2004) J/MNRAS/328/150 : KX redshift survey (Croom+, 2001) J/A+A/437/883 : K20 survey: spectroscopic catalogue (Mignoli+, 2005) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [AMK2006] Identification number 3 A1 --- m_[AMK2006] Multiplicity index on [AMK2006] 5- 11 A7 --- --- [ATCDFS_] 12- 30 A19 --- ATCDFS Radio source name ( 32- 37 F6.3 mJy S1.4GHz The 1.4GHz flux density 39- 43 F5.3 mJy e_S1.4GHz Error in S1.4GHz 45- 63 A19 --- ACS The ACS source name (J2000 position) 65 A1 --- f_ACS [ab] Flag on ACS (1) 67- 70 F4.2 --- Rel ? Reliability of ACS identification 72- 75 F4.1 arcsec rACS ? Distance between radio and ACS positions 77 A1 --- l_zmag Limit flag on zmag 79- 84 F6.3 mag zmag The ACS z850 band (AB) magnitude (2) 86-104 A19 --- CXO The CXO source name 106 A1 --- f_CXO [c] Flag on CXO (3) 108-111 F4.1 arcsec rCXO ? Distance between radio and CXO positions 113 A1 --- l_F0.5-2keV Limit flag on F0.5-2keV 115-119 F5.2 10-18W/m2 F0.5-2keV ? The 0.5-2keV flux 121 A1 --- l_F2-8keV Limit flag on F2-8keV 123-127 F5.2 10-18W/m2 F2-8keV ? The 2-8keV flux
Note (1): Flag on ACS, defined as follows: a = Optical sources deblended using SExtractor b = Optical source not in the released ACS catalogue. The zmag magnitude results from aperture photometry. Note (2): z850 is the HST ACS F850LP filter, which correspond to the SDSS z filter (850nm peak, 945nm centered). Note (3): A "c" indicates X-ray sources from Giacconi et al. (2002, Cat. J/ApJS/139/369); the source is denoted by its number in the catalogue therein, while the flux in the 2-8keV band is an estimate based on the reported flux in the 2-10keV band and assuming a power-law photon index of 1.4.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [AMK2006] Identification number 3 A1 --- m_[AMK2006] Multiplicity index on [AMK2006] 5- 9 F5.3 --- z ? Spectroscopic redshift 11 A1 --- f_z Flag on zspec (1) 13- 15 F3.1 --- q_z ? Quality flag on zspec (2) 17- 21 F5.3 --- zphC ? COMBO-17 photometric redshift (Wolf et al. 2004, Cat. II/253) 23- 27 F5.3 --- e_zphC ? Error in zphotC 29- 34 A6 --- CClass COMBO-17 classification (Wolf et al. 2004) 36- 39 F4.2 --- zphM ? Mobasher et al. (2004ApJ...600L.167M) photometric redshift 41- 49 A9 --- n_zphM The 95% confidence interval in zphotM 51- 54 F4.2 --- SpType ? Mobasher et al. (2004ApJ...600L.167M) best-fit spectral type (3) 56- 57 I2 --- NBand ? Number of bands the source is detected in Mobasher et al. (2004ApJ...600L.167M) 59- 63 F5.2 [W/Hz] L1.4GHz ? Log of the 1.4GHz luminosity 65- 69 F5.2 [10-7W] LX ? Log of the 0.5-8keV luminosity in units of erg/s 71 A1 --- l_R/O Limit flag on R/O 73- 77 F5.2 --- R/O Radio (1.4GHz) to optical flux ratio 79 A1 --- l_X/O Limit flag on X/O 81- 85 F5.2 --- X/O ? X-ray to optical flux ratio 87 A1 --- l_HR Limit flag on HR 89- 93 F5.2 --- HR ? Hardness ratio (4) 95 A1 --- f_HR [b] HR as in Giacconi et al. (2002, Cat. J/ApJS/139/369) (5) 97 A1 --- l_Gamma Limit flag on Gammma 98-102 F5.2 --- Gamma ? Effective photon index 104 A1 --- f_Gamma [a] Indicates a generic photon index due to low number of counts 106-109 A4 --- Class X-ray or radio classification (7) 111-118 A8 ---- OClass Optical classification (8)
Note (1): Flag on z-spec, defined as follows: s = Spectra from Szokoly et al. (2004, Cat. J/ApJS/155/271); v = Spectra from Vanzella et al. (2004, Cat. J/A+A/434/53); l = Spectra from Le Fevre et al. (2004, Cat. J/A+A/428/1043); c = Spectra from Croom, Warren, & Glazebrook (2001, Cat. J/MNRAS/328/150); m = Spectra from Mignoli et al. (2005, Cat. J/A+A/437/883). Note (2): We have converted quality flags from other works to a scale more similar to the one in Szokoly et al. (2004, Cat. J/ApJS/155/271), namely: 2.0 denotes a reliable redshift determination, 1.0 indicates that some spectroscopic feature exists but cannot be securely identified, and 0.5 flags sources for which there is only a hint of a spectral feature. Note (3): Where E=1, Sbc=2, Scd=3, IM=4, and Starburst=5,6. Note (4): Derived from the 0.5-2 and 2-8keV band counts. For sources detected only in the Giacconi et al. (2002, Cat. J/ApJS/139/369) catalogs, we report the quoted hardness ratio, derived from the 0.5-2keV and 2-10keV band counts. Note (5): Calculated using the 0.5-2 and 2-10keV bands. Note (7): Obtained from the X-ray characteristics (LX and/or HR) or, if possible for sources with insufficient X-ray information, from the radio power. Note (8): As in Szokoly et al. (2004, Cat. J/ApJS/155/271), or after estimating any possible line-emission diagnostic ratios (Sey2 or SF).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 16-Jan-2007
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