J/ApJ/698/740 VLA survey of CDF-S. III. (Tozzi+, 2009)
The VLA survey of the Chandra Deep Field-South. III. X-ray spectral properties of radio sources. Tozzi P., Mainieri V., Rosati P., Padovani P., Kellermann K.I., Fomalont E., Miller N., Shaver P., Bergeron J., Brandt W.N., Brusa M., Giacconi R., Hasinger G., Lehmer B.D., Nonino M., Norman C., Silverman J. <Astrophys. J., 698, 740-755 (2009)> =2009ApJ...698..740T
ADC_Keywords: X-ray sources ; Radio continuum ; Cross identifications ; Active gal. nuclei ; Surveys Keywords: cosmology: observations - galaxies: active - galaxies: starburst - radio continuum: galaxies - X-rays: galaxies Abstract: We discuss the X-ray properties of the radio sources detected in a deep 1.4 and 5GHz VLA Radio survey of the Extended Chandra Deep Field-South (E-CDFS). Among the 266 radio sources detected, we find 89 sources (1/3 of the total) with X-ray counterparts in the catalog of the 1Ms exposure of the central 0.08deg2 or in the catalog of the 250ks exposure of the 0.3deg2 E-CDFS field. For 76 (85%) of these sources, we have spectroscopic or photometric redshifts, and therefore we are able to derive their intrinsic properties from X-ray spectral analysis, namely intrinsic absorption and total X-ray luminosities. We find that the population of submillijansky radio sources with X-ray counterparts is composed of a mix of roughly 1/3 star-forming galaxies and 2/3 active galactic nuclei (AGNs). Description: We observed the whole area of the E-CDFS (∼0.3deg2) with the NRAO VLA for 50hr at 1.4GHz mostly in the BnA configuration in 1999 and 2001 February, and for 32hr at 5GHz mostly in the C and CnB configurations in 2001. The effective angular resolution is 3.5". Here we use the radio catalog presented in Paper I (Kellermann et al., 2008, Cat. J/ApJS/179/71). In the E-CDFS area, we have two sets of X-ray data. The first is the 1Ms exposure in the central ∼0.1deg2 (Rosati et al. 2002ApJ...566..667R; Giacconi et al. 2002, Cat. J/ApJS/139/369; Alexander et al. 2003, Cat. J/AJ/126/539), the second one is the shallower ∼250ks coverage of a square region of 0.28deg2 centered on the above field (Lehmer et al. 2005, Cat. J/ApJS/161/21). For the sources identified in the 1Ms exposure of the CDFS, the spectroscopic identification program carried out with the ESO-VLT is presented in Szokoly et al. (2004, Cat. J/ApJS/155/271). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 77 49 Optical and X-ray properties of radio sources with X-ray matches in the 1Ms exposure (Giacconi et al. 2002, Cat. J/ApJS/139/369) table2.dat 77 27 X-ray properties of radio sources with X-ray matches in the E-CDFS (Lehmer et al. 2005, Cat. J/ApJS/161/21) table4.dat 69 174 X-ray photometric properties of radio sources without X-ray matches (from aperture photometry on the X-ray images at the radio positions)
See also: J/ApJS/179/95 : VLA survey of CDF-S. II. (Mainieri+, 2008) J/ApJS/179/71 : VLA survey of the CDF-S I. (Kellermann+, 2008) J/ApJS/179/114 : VLA 1.4GHz survey of E-CDF-S (Miller+, 2008) J/A+A/451/457 : X-ray properties of AGN in CDFS (Tozzi+, 2006) J/ApJS/161/21 : Extended Chandra Deep Field-South survey (Lehmer+, 2005) J/ApJS/155/271 : CDF-S: Optical spectroscopy (Szokoly+, 2004) J/ApJS/155/73 : Photometric redshifts of X-ray sources in CDF-S (Zheng+, 2004) J/AJ/126/539 : The Chandra Deep Fields North and South (Alexander+, 2003) J/ApJS/139/369 : Chandra Deep Field South. 1 Ms catalog (Giacconi+, 2002) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- RID Radio source number (<[KFM2008] RID NNN> in Simbad) 5- 7 I3 --- XID X-ray source number (1) 8 A1 --- n_XID [ms ] source fitting (2) 10- 15 F6.4 --- z Redshift, photometric or spectroscopic (see q_z) 17- 20 F4.2 --- q_z [0,2] Optical spectrum quality (3) 22 I1 --- OT [0,4] Optical type (4) 24- 27 F4.2 --- Gamma Spectral slope 29- 32 F4.2 --- E_Gamma ? Positive error on Γ 34- 37 F4.2 --- e_Gamma ? Positive error on Γ 39 A1 --- l_NH Limit flag on NH 40- 46 F7.3 10+22cm-2 NH Hydrogen column density 48- 53 F6.2 10+22cm-2 E_NH ? Positive error on NH 55- 61 F7.3 10+22cm-2 e_NH ? Negative error on NH 63- 69 E7.3 10-7W Ls Soft X-ray luminosity in the 0.5-2keV band 71- 77 E7.3 10-7W Lh Hard X-ray luminosity in the 2-10keV band
Note (1): XID from: * table1: Giacconi et al. 2002, Cat J/ApJS/139/369; <[GZW2002] XID NNN> in Simbad * table2: Lehmer et al., 2005, Cat. J/ApJS/161/21; <[LBA2005] NNN> in Simbad Note (2): Flag (only for table 1) as follows: s = source fitted with a soft component m = source fitted with a reflection model (pexrav) as in Tozzi et al. (2006, Cat. J/A+A/451/457) Note (3): Same conventions as Zheng et al. 2004, Cat. J/ApJS/155/73 (<1 is photometric, ≥1 is spectroscopic, 2 is secure spectroscopic; however many more intermediate values exist here than in Zheng et al.) Note (4): Optical type as follows: 1 = broad line AGN (BLAGN); 2 = high excitation line (HEX); 3 = low excitation lines (LEX); 4 = absorption spectrum galaxy (ABS). 0 = only photometric redshifts are available or no optical classification is possible.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- RID Radio source number (<[KFM2008] RID NNN> in Simbad) 5 A1 --- l_SCts Limit flag on SCts (1) 6- 10 F5.2 ct SCts Counts in the soft 0.5-2keV band 12- 16 F5.2 ct e_SCts ? SCts uncertainty 18 A1 --- l_HCts Limit flag on HCts (1) 19- 23 F5.2 ct HCts Counts in the hard 2-7keV band 25- 29 F5.2 ct e_HCts ? HCts uncertainty 31- 33 F3.1 --- SS/N Soft signal to noise ratio 35- 37 F3.1 --- HS/N Hard signal to noise ratio 39- 43 F5.2 --- HR ? Hardness ratio (2) 45 A1 --- l_Ssoft Limit flag on Ssoft (1) 46- 53 E8.2 mW/m2 Ssoft 0.5-2keV soft band flux 55 A1 --- l_Shard Limit flag on Shard (1) 56- 64 E9.2 mW/m2 Shard Hard band flux 66- 69 F4.2 --- z ? Redshift
Note (1): Upper Limits are at 3σ. Note (2): Hardness ratio defined as HR=(H-S)/(H+S), where H and S are the net counts in the hard (2-7keV) and soft (0.5-2keV) bands, respectively, corrected for vignetting.
History: From electronic version of the journal References: Kellermann et al. Paper I. 2008ApJS..179...71K Cat. J/ApJS/179/71 Mainieri et al. Paper II. 2008ApJS..179...95M Cat. J/ApJS/179/95
(End) Emmanuelle Perret [CDS] 06-Jun-2011
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