J/MNRAS/453/4244 Faint radio source population at 15.7GHz (Whittam+, 2015)
The faint radio source population at 15.7 GHz.
II. Multi-wavelength properties.
Whittam I.H., Riley J.M., Green D.A., Jarvis M.J., Vaccari M.
<Mon. Not. R. Astron. Soc., 453, 4244-4263 (2015)>
=2015MNRAS.453.4244W 2015MNRAS.453.4244W (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Radio sources ; Photometry ; Redshifts
Keywords: catalogues - surveys - galaxies: active - radio continuum: galaxies
Abstract:
A complete, flux density limited sample of 96 faint (>0.5mJy) radio
sources is selected from the 10C survey at 15.7GHz in the Lockman
Hole. We have matched this sample to a range of multi-wavelength
catalogues, including Spitzer Extragalactic Representative
Volume Survey, Spitzer Wide-area Infrared Extragalactic survey,
United Kingdom Infrared Telescope Infrared Deep Sky Survey and optical
data; multi-wavelength counterparts are found for 80 of the 96 sources
and spectroscopic redshifts are available for 24 sources. Photometric
redshifts are estimated for the sources with multi-wavelength data
available; the median redshift of the sample is 0.91 with an
interquartile range of 0.84. Radio-to-optical ratios show that at
least 94 per cent of the sample are radio loud, indicating that the
10C sample is dominated by radio galaxies. This is in contrast to
samples selected at lower frequencies, where radio-quiet AGN and
star-forming galaxies are present in significant numbers at these flux
density levels. All six radio-quiet sources have rising radio spectra,
suggesting that they are dominated by AGN emission. These results
confirm the conclusions of that the faint, flat-spectrum sources which
are found to dominate the 10C sample below ∼1mJy are the cores of
radio galaxies. The properties of the 10C sample are compared to the
Square Kilometre Array Design Studies Simulated Skies; a population of
low-redshift star-forming galaxies predicted by the simulation is not
found in the observed sample.
Description:
The work in Paper I (Whittam et al., 2013, Cat. J/MNRAS/429/2080) is
based on a sample of sources selected from the 10C survey at 15.7GHz.
In this paper we have studied the multi-wavelength properties of a
complete sample of 96 sources selected from the 10C survey. This
sample was matched to the Data Fusion multi-wavelength catalogue,
which contains up to 10 photometric bands in the optical and
mid-infrared, and counterparts were identified for 80 out of 96 10C
Jsources. Spectroscopic redshifts are available for 24 sources.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 128 96 Multi-wavelength properties of the 96 10C
sources studied in this paper
tablea2.dat 93 24 References for the spectroscopic redshifts
used in this work
--------------------------------------------------------------------------------
See also:
II/326 : Revised SWIRE photometric redshifts (Rowan-Robinson+, 2013)
J/MNRAS/415/2708 : 10C survey of radio sources at 15.7GHz (Davies+, 2011)
J/ApJS/198/1 : Photometry catalogs for the Lockman Hole (Fotopoulou+, 2012)
J/MNRAS/429/2080 : Lockman Hole 10C sources radio spectral indices
(Whittam+ 2013)
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [10C]
5- 18 A14 --- 10C 10C designation (JHHMMSS+DDMMSS)
20- 24 F5.2 mag gmag ?=- g magnitude (AB)
26- 30 F5.2 mag imag ?=- i magnitude (AB)
32- 36 F5.2 mag rmag ?=- r magnitude (AB)
38- 42 F5.2 mag zmag ?=- z magnitude (AB)
44- 48 F5.2 mag Jmag ?=- J magnitude (AB)
50- 54 F5.2 mag Kmag ?=- K magnitude (AB)
56- 62 F7.2 uJy FSERVS1 ? SERVS1 (3.6um) flux density
63 A1 --- n_FSERVS1 [*] *: value estimated from the SERVS image
64- 69 F6.2 uJy FSERVS2 ? SERVS2 (4.5um) flux density
71- 77 F7.2 uJy FSWIRE1 ? SWIRE1 (3.6um) flux density
79- 84 F6.2 uJy FSWIRE2 ? SWIRE2 (4.5um) flux density
86- 91 F6.2 uJy FSWIRE3 ?=- SWIRE3 (5.8um) flux density
93- 99 F7.2 uJy FSWIRE4 ?=- SWIRE4 (8.0um) flux density
101 I1 --- Flag [1/7] Optical matching flag (1)
103-106 F4.2 --- z ?=- Le PHARE redshift
108-111 F4.2 --- RR13z ? Redshift from Rowan-Robinson et al.,
(2013MNRAS.428.1958R 2013MNRAS.428.1958R, Cat. II/326)
113-116 F4.2 --- F12z ? Redshift from Fotopoulou et al.
(2012, Cat. J/ApJS/198/1)
118-121 F4.2 --- zsp ? Spectroscopic redshift
123-126 F4.2 --- zBest ?=- Best redshift used in the analysis (2)
128 I1 --- f_z [1/4]? Origin of final redshift value flag (3)
--------------------------------------------------------------------------------
Note (1): Optical matching flag as follows:
1 = extended, probable match
2 = extended, possible match
3 = extended, confused
4 = extended, no match
5 = compact, match
6 = compact, no match
7 = 10C position only
Note (2): Final redshift value, description is given in Section 4.3.
Note (3): Origin of final redshift value as follows:
1 = spectroscopic (see Table A2)
2 = RR13, Rowan-Robinson et al., 2013MNRAS.428.1958R 2013MNRAS.428.1958R, Cat. II/326
3 = F12, Fotopoulou et al. (2012, Cat. J/ApJS/198/1)
4 = LE PHARE
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [10C]
5- 18 A14 --- 10C 10C designation (JHHMMSS+DDMMSS)
20- 23 F4.2 --- zsp Specroscopic redshift
25- 93 A69 --- r_zsp Reference for redshift
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Whittam et al., Paper I 2013MNRAS.429.2080W 2013MNRAS.429.2080W, Cat. J/MNRAS/429/2080
(End) Patricia Vannier [CDS] 21-Jun-2016