J/ApJS/179/95 VLA survey of CDF-S. II. (Mainieri+, 2008)
The VLA survey of the Chandra deep field-south.
II. Identification and host galaxy properties of submillijansky sources.
Mainieri V., Kellermann K.I., Fomalont E.B., Miller N., Padovani P.,
Rosati P., Shaver P., Silverman J., Tozzi P., Bergeron J., Hasinger G.,
Norman C., Popesso P.
<Astrophys. J. Suppl. Ser., 179, 95-113 (2008)>
=2008ApJS..179...95M 2008ApJS..179...95M
ADC_Keywords: Radio sources ; Cross identifications ; Surveys ; Redshifts ;
Photometry, infrared
Keywords: cosmology: observations - galaxies: active - galaxies: starburst -
radio continuum: galaxies
Abstract:
We present the optical and infrared identifications of the 266 radio
sources detected at 20cm with the Very Large Array in the Chandra Deep
Field-South. Using deep i-band Advanced Camera for Surveys, R-band
Wide Field Imager, K-band SOFI NTT, K-band ISAAC VLT and Spitzer
imaging data, we are able to find reliable counterparts for 254 (∼95%)
VLA sources. Twelve radio sources remain unidentified, and three of
them are "empty fields". Using literature and our own data we are able
to assign redshifts to 186 (∼70%) radio sources: 108 are spectroscopic
redshifts and 78 are reliable photometric redshifts. Based on the
rest-frame colors and morphological distributions of the host
galaxies, we find evidences for a change in the submillijansky radio
source population: (1) above ∼0.08mJy early-type galaxies are
dominating and (2) at flux densities below ∼0.08mJy, starburst
galaxies become dominant.
Description:
The CDF-S area has been imaged with the Very Large Array (VLA) down to
8.5uJy rms near the field center and 3.5" resolution at both 1.4 and
5GHz. The radio catalog include 266 sources reported in Paper I
(observed in 1999 and 2001; Kellermann et al., 2008, Cat. J/ApJS/179/71).
In the optical band, we used data obtained with the Advanced Camera
for Surveys (ACS) on board HST and the Wide Field Imager (WFI)
installed at the 2.2m telescope in La Silla. In the NIR, we used the
ISAAC VLT Ks (2162nm) data from the GOODS survey and SOFI NTT.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 125 267 Optical, near infrared primary counterparts of
the 20cm sources in the E-CDF-S
table4.dat 122 25 Optical, near infrared secondary counterparts of
the 20cm sources in the E-CDF-S
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008)
J/A+A/377/442 : Chandra Deep Field South: R-band photometry (Wolf+, 2001)
J/A+A/428/1043 : Redshifts from VIMOS VLT Deep Survey (Le Fevre+, 2004)
J/ApJS/155/271 : Chandra Deep Field-South: Optical spectroscopy (Szokoly+,
2004)
J/ApJS/161/21 : Extended Chandra Deep Field-South survey (Lehmer+, 2005)
J/A+A/434/53 : GOODS-South Field redshifts (Vanzella+, 2005)
J/AJ/131/1216 : Faint radio sources in the CDF-S ACS field (Afonso+, 2006)
J/ApJ/179/114 : VLA 1.4GHz survey of E-CDF-S (Miller+, 2008)
J/ApJS/179/71 : VLA survey of the CDF-S I. (Kellermann+, 2008)
J/A+A/478/83 : GOODS-South Field VLT/FORS2 redshifts. III. (Vanzella+, 2008)
J/ApJS/187/560 : Photometric redshifts of the 2Ms CDF-S (Luo+, 2010)
Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running identification number
(<[KFM2008] RID NNNA> in Simbad)
4 A1 --- m_Seq [AB] Multiplicity index (for source 178)
6 I1 h RAh Radio Hour of Right Ascension (J2000)
8- 9 I2 min RAm Radio Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Radio Second of Right Ascension (J2000)
17 A1 --- DE- Sign of the Radio Declination (J2000)
18- 19 I2 deg DEd Radio Degree of Declination (J2000)
21- 22 I2 arcmin DEm Radio Arcminute of Declination (J2000)
24- 27 F4.1 arcsec DEs Radio Arcsecond of Declination (J2000)
29 I1 h RAOh ? Optical Hour of Right Ascension (J2000) (1)
31- 32 I2 min RAOm ? Optical Minute of Right Ascension (J2000) (1)
34- 38 F5.2 s RAOs ? Optical Second of Right Ascension (J2000) (1)
40 A1 --- DEO- Sign of the Optical Declination (J2000)(1)
41- 42 I2 deg DEOd ? Optical Degree of Declination (J2000) (1)
44- 45 I2 arcmin DEOm ? Optical Arcminute of Declination (J2000) (1)
47- 50 F4.1 arcsec DEOs ? Optical Arcsecond of Declination (J2000) (1)
52- 54 F3.1 arcsec Sep ? Separation between Radio and Optical positions
55 A1 --- --- [0]
57- 63 F7.2 --- LR ? Likelihood ratio (2)
65- 68 F4.2 --- Rel ? Reliability parameter (3)
70- 76 A7 --- Cat Catalog counterpart selected from (4)
78 A1 --- l_Rmag Limit flag on Rmag
79- 83 F5.2 mag Rmag ? R-band AB magnitude
85- 88 F4.2 mag e_Rmag ? Uncertainty in Rmag
90 A1 --- f_Rmag [S] Flag on Rmag (only for table3) (5)
92 A1 --- l_Kmag Limit flag on Kmag
93- 97 F5.2 mag Kmag ? K-band AB magnitude
99-102 F4.2 mag e_Kmag ? Uncertainty in Kmag
104-108 F5.3 --- zsp ? Spectroscopic redshift of counterpart
109 A1 --- r_zsp [a-g] zsp reference (6)
111 I1 --- q_zsp [1/2]? Quality flag for zsp (2=secure) (7)
113-116 F4.2 --- zph ? Photometric redshift of counterpart
118-122 F5.3 --- e_zph ? Uncertainty in zph
124-125 A2 --- r_zph Origin and note on zph (only for table3) (8)
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Note (1): Of the primary counterpart. The positional error is 0.05".
Note (2): LR=(q(m)f(r))/n(m) where q(m) is the expected probability
distribution as a function of magnitude of the true counterparts, f(r)
is the probability distribution of the positional errors, and n(m) is
the surface density as a function of magnitude of background objects.
Note (3): The reliability of a particular source j to be the true
counterpart is given by Rj=LRj/(ΣiLRi+(1-Q)') where i
runs over the set of all candidate counterparts for that particular
radio source, and Q is the probability that the counterpart of the
source is above the magnitude limit of the optical/NIR catalog. See
section 3 for further details.
Note (4): Catalog as follows:
ACS-i = i band catalog from ACS/GOODS;
WFI-R = R band catalog from WFI;
ISAAC-K = K band catalog from ISAAC;
SOFI-K = K band catalog from SOFI;
GEMS = z band catalog from ACS/GEMS;
SPITZER = IRAC and MIPS images.
Note (5):
S = The optical photometry could be contaminated by a close-by bright star.
Note (6): Flag as follows:
a = Spectroscopic redshift from Szokoly et al. (2004, Cat. J/ApJS/155/271,
<[SBH2004] JHHMMSS.ss+DDMMSS.s> in Simbad). The average redshift
uncertainty is Δz=0.005.
b = Spectroscopic redshift from Silvermann et al., in preparation.
c = Spectroscopic redshift from Vanzella et al. 2005 (Cat. J/A+A/434/53),
2006 (Cat. J/A+A/454/423), 2008 (Cat. J/A+A/478/83). The
average redshift uncertainty is Δz=0.00055.
d = Spectroscopic redshift from Popesso et al. (2009A&A...494..443P 2009A&A...494..443P).
e = Spectroscopic redshift from Le Fevre (2004, Cat. J/A+A/428/1043,
in Simbad). The average redshift uncertainty is
Δz=0.0012.
f = Spectroscopic redshift from Mignoli et al. (2005, Cat. J/A+A/437/883).
g = Spectroscopic redshift from Ravikumar et al. (2007,
Cat. J/A+A/465/1099, <[RPF2007] EIS JHHMMSS.ss+DDMMSS.s> in Simbad).
Note (7): Quality flag as follows:
2 = secure redshift (multiple spectral features);
1 = tentative redshift (e.g. based on a single emission line).
Note (8): Flag as follows:
1 = Photometric redshift from Wolf et al. (2004, Cat. II/253,
<[WDK2001] NNNNN> or in Simbad)).
2 = Photometric redshift from Grazian et al. (2006, Cat. J/A+A/449/951,
<GOODS-MUSIC NNNNN> in Simbad).
3 = Photometric redshift from Zheng et al. (2004, Cat. J/ApJS/155/73,
<[GZW2002] XID NNN> in Simbad).
* = The optical photometry could be contaminated by a close-by
(∼1.3") source.
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History:
From electronic version of the journal
References:
Kellermann et al., Paper I. 2008ApJS..179...71K 2008ApJS..179...71K Cat. J/ApJS/179/71
Tozzi et al., Paper III. 2009ApJ...698..740T 2009ApJ...698..740T Cat. J/ApJ/698/740
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Sep-2010