2013MNRAS.428..935H


Query : 2013MNRAS.428..935H

2013MNRAS.428..935H - Mon. Not. R. Astron. Soc., 428, 935-951 (2013/January-2)

Sub-millimetre source identifications and the microjansky source population at 8.4GHz in the William Herschel Deep Field.

HEYWOOD I., BIELBY R.M., HILL M.D., METCALFE N., RAWLINGS S., SHANKS T. and SMIRNOV O.M.

Abstract (from CDS):

Sub-millimetre observations of the William Herschel Deep Field (WHDF) using the Large Apex Bolometer Camera (LABOCA) revealed possible sub-mm counterparts for two X-ray-absorbed quasars. The primary aim here is to exploit Expanded Very Large Array (EVLA) radio continuum imaging at 8.4GHz to establish the absorbed quasars as radio/sub-mm sources. The main challenge in reducing the WHDF EVLA data was the presence of a strong 4C source at the field edge. A new calibration algorithm was applied to the data to model and subtract this source. The resulting thermal noise limited radio map covers a sky area which includes the 16x16 arcmin2 Extended WHDF. It contains 41 radio sources above the 4σ detection threshold, 17 of which have primary beam corrected flux densities. The radio observations show that the two absorbed active galactic nuclei (AGN) with LABOCA detections are also coincident with radio sources, confirming the tendency for X-ray-absorbed AGN to be sub-mm bright. These two sources also show strong ultraviolet excess (UVX) which suggest that the nuclear sightline is gas absorbed but not dust absorbed. Of the three remaining LABOCA sources within the ~5 arcmin half-power diameter of the EVLA primary beam, one is identified with a faint nuclear X-ray/radio source in a nearby galaxy, one with a faint radio source and the other is unidentified in any other band.

More generally, differential radio source counts calculated from the beam-corrected data are in good agreement with previous observations, showing at S < 50µJy a significant excess over a pure AGN model. In the full area, of 10 sources fainter than this limit, six have optical counterparts of which three are UVX (i.e. likely quasars) including the two absorbed quasar LABOCA sources. The other faint radio counterparts are not UVX but are only slightly less blue and likely to be star-forming/merging galaxies, predominantly at lower luminosities and redshifts. The four faint, optically unidentified radio sources may be either dust-obscured quasars or galaxies. These high-redshift obscured AGN and lower redshift star-forming populations are thus the main candidates to explain the observed excess in the faint source counts and hence also the excess radio background found previously by the Absolute Radiometer for Cosmology, Astrophysics and Diffuse Emission (ARCADE2) experiment.


Abstract Copyright: © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2012)

Journal keyword(s): techniques: interferometric - galaxies: high-redshift - quasars: general - radio continuum: galaxies

Nomenclature: Table 1: [HBH2013] WHDF-EVLA-NN (Nos 1-41). Table 2: [HBH2013] JHHMMSS.ss+DDMMSS.s N=22.

Simbad objects: 63

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Number of rows : 63
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 [HBH2013] WHDF-EVLA-34 Rad 00 21 43.240 +00 11 24.65           ~ 1 0
2 [HBH2013] WHDF-EVLA-33 Rad 00 21 43.990 +00 18 05.18           ~ 1 0
3 [HBH2013] WHDF-EVLA-24 Rad 00 21 47.320 +00 15 59.91           ~ 1 0
4 [HBH2013] WHDF-EVLA-37 Rad 00 21 47.340 +00 12 23.71           ~ 1 0
5 SDSS J002149.89+002157.5 rG 00 21 49.8963273792 +00 21 57.521028960           ~ 2 0
6 [HBH2013] WHDF-EVLA-3 G 00 21 50.090 +00 22 03.15           ~ 1 0
7 [HBH2013] WHDF-EVLA-11 Rad 00 21 55.420 +00 25 41.58           ~ 1 0
8 [HBH2013] WHDF-EVLA-22 Rad 00 21 58.450 +00 22 41.49           ~ 1 0
9 [HBH2013] WHDF-EVLA-36 Rad 00 21 59.920 +00 20 41.05           ~ 1 0
10 [HBH2013] WHDF-EVLA-12 Rad 00 22 10.950 +00 19 50.99           ~ 1 1
11 [HBH2013] J002211.08+001950.9 ? 00 22 11.08 +00 19 50.9 24.33 24.66   24.18 23.71 ~ 1 1
12 [HBH2013] WHDF-EVLA-41 Rad 00 22 11.570 +00 25 41.96           ~ 1 0
13 [HBH2013] WHDF-EVLA-26 Rad 00 22 13.910 +00 18 05.77           ~ 1 0
14 [HBH2013] J002214.86+002104.2 ? 00 22 14.86 +00 21 04.2 22.48 22.42   20.50 19.62 ~ 1 1
15 [HBH2013] WHDF-EVLA-16 Rad 00 22 14.930 +00 21 04.12           ~ 1 1
16 [HBH2013] WHDF-EVLA-28 Rad 00 22 15.750 +00 31 11.39           ~ 1 0
17 [HBH2013] WHDF-EVLA-2 G 00 22 15.860 +00 21 28.32 22.42 21.90   19.20 18.28 ~ 1 0
18 [HBH2013] WHDF-EVLA-27 Rad 00 22 16.160 +00 19 46.78           ~ 1 1
19 [HBH2013] J002216.22+001945.7 ? 00 22 16.22 +00 19 45.7 23.19 23.40   21.39 20.61 ~ 1 1
20 [HBH2013] WHDF-EVLA-10 G 00 22 20.530 +00 19 01.52 21.73 21.91   20.15 19.29 ~ 1 0
21 [HBH2013] WHDF-EVLA-29 Rad 00 22 21.640 +00 21 49.48           ~ 1 1
22 [HBH2013] J002221.80+002147.3 ? 00 22 21.80 +00 21 47.3 22.44 23.12   22.29 21.38 ~ 1 1
23 [HBH2013] J002222.62+002043.0 ? 00 22 22.62 +00 20 43.0 22.72 22.99   22.12 21.56 ~ 1 1
24 [HBH2013] WHDF-EVLA-19 Rad 00 22 22.660 +00 20 42.82           ~ 1 1
25 [HBH2013] WHDF-EVLA-8 G 00 22 22.850 +00 20 13.98 23.56 24.81   24.02 23.31 ~ 3 0
26 [HBH2013] WHDF-EVLA-21 Rad 00 22 23.890 +00 11 14.61           ~ 1 0
27 [HBH2013] WHDF-EVLA-14 Rad 00 22 24.830 +00 16 47.18           ~ 1 1
28 [HBH2013] WHDF-EVLA-6 G 00 22 24.890 +00 20 10.21 22.95 23.67   22.63 21.57 ~ 3 0
29 [HBH2013] J002224.99+001647.8 ? 00 22 24.99 +00 16 47.8 23.06 23.32   21.74 21.31 ~ 1 1
30 ICRF J002225.4+001456 BiC 00 22 25.4258623 +00 14 56.161217   21.1       ~ 110 1
31 [HBH2013] J002228.24+002153.5 ? 00 22 28.24 +00 21 53.5 23.42 23.59   22.62 22.21 ~ 1 1
32 [HBH2013] WHDF-EVLA-32 smm 00 22 28.250 +00 21 47.24           ~ 2 1
33 [HBH2013] WHDF-EVLA-5 G 00 22 29.150 +00 18 19.78 23.51 23.63   21.62 20.65 ~ 1 0
34 [HBH2013] WHDF-EVLA-38 Rad 00 22 30.070 +00 30 02.58           ~ 1 0
35 [HBH2013] WHDF-EVLA-15 Rad 00 22 30.090 +00 19 41.63           ~ 1 0
36 [HBH2013] WHDF-EVLA-39 Rad 00 22 30.84 +00 22 53.9           ~ 1 1
37 [HBH2013] J002230.95+002254.5 ? 00 22 30.95 +00 22 54.5 24.83 25.24   23.77 22.77 ~ 1 1
38 [HBH2013] WHDF-EVLA-4 G 00 22 31.070 +00 22 24.81 25.84 25.52   23.29 21.65 ~ 1 0
39 [HBH2013] WHDF-EVLA-30 Rad 00 22 31.640 +00 31 25.44           ~ 1 0
40 LEDA 1448 G 00 22 31.8774657432 +00 21 27.133992684 17.53 17.49   16.07 15.34 ~ 8 0
41 [HBH2013] WHDF-EVLA-23 Rad 00 22 32.020 +00 18 11.78           ~ 1 1
42 [HBH2013] J002232.09+001811.1 ? 00 22 32.09 +00 18 11.1 26.36 26.20   24.91 23.55 ~ 1 1
43 [HBH2013] WHDF-EVLA-9 G 00 22 32.600 +00 23 28.48 20.64 20.93   19.31 18.53 ~ 1 0
44 NAME Herschel Deep Field reg 00 22 33 +00 19.6           ~ 34 0
45 [HBH2013] J002236.78+002056.5 ? 00 22 36.78 +00 20 56.5       19.82   ~ 1 1
46 [HBH2013] WHDF-EVLA-25 Rad 00 22 36.860 +00 20 55.57           ~ 1 1
47 [HBH2013] WHDF-EVLA-18 Rad 00 22 37.790 +00 23 36.78           ~ 1 1
48 SDSS J002237.82+002337.6 G 00 22 37.823 +00 23 37.69 18.56 18.70   17.39 16.69 ~ 3 1
49 [HBH2013] J002239.94+001838.6 ? 00 22 39.94 +00 18 38.6 27.06 25.86   22.44 20.77 ~ 1 1
50 [HBH2013] WHDF-EVLA-7 Rad 00 22 39.97 +00 18 38.2           ~ 1 1
51 [HBH2013] J002242.84+001954.8 ? 00 22 42.84 +00 19 54.8 23.86 23.84   21.60 20.64 ~ 1 1
52 [HBH2013] WHDF-EVLA-17 Rad 00 22 42.960 +00 19 56.28           ~ 1 1
53 [HBH2013] WHDF-EVLA-40 Rad 00 22 48.380 +00 14 49.05           ~ 1 0
54 [HBH2013] J002253.22+001659.8 ? 00 22 53.22 +00 16 59.8 20.18 20.12   18.43 17.65 ~ 1 1
55 [HBH2013] WHDF-EVLA-20 Rad 00 22 53.440 +00 16 57.03           ~ 1 1
56 [HBH2013] WHDF-EVLA-13 Rad 00 22 54.370 +00 30 39.98           ~ 1 0
57 [HBH2013] WHDF-EVLA-31 Rad 00 22 59.130 +00 11 20.34           ~ 1 0
58 [HBH2013] WHDF-EVLA-35 Rad 00 22 59.700 +00 12 34.81           ~ 1 0
59 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2698 2
60 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 715 0
61 SA 13- reg 10 48 +11.5           ~ 11 0
62 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 644 0
63 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3958 3

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2022.10.06-19:54:30

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