1997A&A...319....7D

Query : 1997A&A...319....7D

1997A&A...319....7D - Astronomy and Astrophysics, volume 3197-17 (1997/3-1)

Deep radio observations of the "Lockman Hole".

DE RUITER H.R., ZAMORANI G., PARMA P., HASINGER G., HARTNER G., TRUEMPER J., BURG R., GIACCONI R. and SCHMIDT M.

Abstract (from CDS):

A deep radio image of the "Lockman Hole" is presented. The observations, done with the C-configuration of the Very Large Array at a wavelength of 20cm, are part of a wider study of this field in X-rays with the ROSAT satellite. Optical follow up will provide a sample of objects observed down to very faint flux limits in all three wavelength windows. The radio data reduction is described and a catalog of 149 radio sources with peak flux densities at least four times the local RMS noise is presented. The limiting peak flux density in the central part of the field is ∼120µJy. The sources have been extracted from a circular area of 20' radius around the field center. Radio source counts are briefly discussed and shown to be in good agreement with previous results at similar flux densities. All radio sources have been searched for optical counterparts on POSS prints and an optical candidate has been found for ∼30% of the radio sources. The optical identification rate increases at fluxes S≲0.5mJy and the increase is mainly due to identifications with relatively bright galaxies (mr<17.5). Cross correlation with the X-ray source list, which contains 135 sources in the same area, yields 16 possible radio/X-ray associations. After correcting for expected spurious associations, we estimate that ∼10% of the X-ray sources are associated with radio sources at these fluxes. Deep CCD frames provide optical counterparts for most of the radio/X-ray sources. On the basis of partial spectroscopy, optical morphology and correlations between radio, optical and X-ray fluxes, we conclude that although the majority (> 60%) of the radio/X-ray associations are identified with AGNs, a non-negligible fraction of them (≲40%) appears to be associated with normal galaxies. Most of these galaxies have low fluxes, both in radio and in X-rays and they may partly represent the bright X-ray tail of the same population that is responsible for the upturn in the radio source counts below 1 mJy.

Abstract Copyright: ∼

Journal keyword(s): radio continuum: general - X-rays: general

Nomenclature: Table 1: [DZP97] NNNa (Nos 1-149) N=160

CDS comments: Tables 2, 3, col(1): RDS NN or NNA in SIMBAD.

Simbad objects: 162

goto View the references in ADS

Number of rows : 162
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 910 0
2 10C J104943+571739 rG 10 49 43.810 +57 17 37.18           ~ 7 0
3 [DZP97] 2 Rad 10 49 51.334 +57 28 12.30           ~ 3 0
4 [DZP97] 3 Rad 10 49 53.13 +57 26 15.6           ~ 1 0
5 10C J105007+572020 rG 10 50 08.1 +57 20 18       25.20   ~ 8 1
6 10C J105012+571134 Rad 10 50 12.6 +57 11 37       24.44   ~ 5 1
7 LHW J105014+572844 rG 10 50 14.4 +57 28 44           ~ 3 0
8 [DZP97] 7 Rad 10 50 15.64 +57 13 14.9           ~ 1 0
9 SWIRE J105019.40+572837.6 rG 10 50 19.2 +57 28 37           ~ 2 0
10 [VV98] J105019.8+572812 QSO 10 50 19.7237 +57 28 12.866     18.70     ~ 16 0
11 LHW J105023+572439 Rad 10 50 23.36 +57 24 39.1           ~ 3 0
12 SWIRE J105025.35+573313.2 rG 10 50 25.35 +57 33 13.2           ~ 2 0
13 LHW J105026+570744 Rad 10 50 26.32 +57 07 44.0           ~ 3 0
14 [DZP97] 13 Rad 10 50 27.36 +57 21 15.5           ~ 1 0
15 LHW J105029+571427 Rad 10 50 29.23 +57 14 27.6           ~ 3 0
16 GMRTLH J105031.8+572026 Rad 10 50 32.0 +57 20 27           ~ 3 1
17 [DZP97] 16 Rad 10 50 32.670 +57 26 46.63           ~ 3 0
18 [DZP97] 17 Rad 10 50 33.00 +57 35 31.1           ~ 1 0
19 [DZP97] 18 rG 10 50 34.0 +57 29 22           ~ 7 0
20 LHW J105034+572152 Rad 10 50 34.035 +57 21 52.39           ~ 4 0
21 [DZP97] 20 Rad 10 50 34.32 +57 15 22.7           ~ 1 0
22 [DZP97] 21 Rad 10 50 35.72 +57 26 01.7           ~ 1 0
23 LHW J105038+572330A Rad 10 50 35.95 +57 23 18.2           ~ 3 0
24 LHW J105037+573741 Rad 10 50 37.10 +57 37 43.2           ~ 2 0
25 LHW J105037+572844 Rad 10 50 37.50 +57 28 45.7           ~ 2 0
26 [VV98] J105039.6+572337 QSO 10 50 39.5438741904 +57 23 36.609192456   19.85 19.55 19.14   ~ 47 1
27 [DZP97] 26 Rad 10 50 40.678 +57 33 08.25       23.24   ~ 3 0
28 LEDA 2557557 rG 10 50 41.920 +57 07 06.41           ~ 9 0
29 LHW J105045+573733 Rad 10 50 45.225 +57 37 34.01           ~ 4 0
30 LHW J105050+570714 Rad 10 50 50.47 +57 07 15.4           ~ 3 0
31 LEDA 3408440 rG 10 50 52.3906267704 +57 35 07.117844784           ~ 16 0
32 ISO-LHDS J105053+572425 rG 10 50 53.410 +57 24 25.78           ~ 5 0
33 LHW J105054+570810 Rad 10 50 54.64 +57 08 10.5           ~ 3 0
34 LHW J105056+571531 Rad 10 50 56.55 +57 15 32.8           ~ 3 0
35 ISO-LHDS J105056+571632 rG 10 50 56.774 +57 16 32.39           ~ 2 0
36 LHW J105057+572955 Rad 10 50 57.60 +57 29 57.8           ~ 2 0
37 LHW J105100+572035 Rad 10 51 00.92 +57 20 36.1           ~ 3 0
38 LHW J105101+573445 Rad 10 51 01.88 +57 34 45.5           ~ 3 0
39 LHW J105105+571057 rG 10 51 05.8 +57 10 56           ~ 3 0
40 RDS 87 Rad 10 51 06.705 +57 11 52.78       21.04   ~ 3 0
41 ISO-LHDS J105110+571603 rG 10 51 10.634 +57 16 03.92           ~ 2 0
42 SDSS J105113.29+571426.7 rG 10 51 13.295 +57 14 26.71           ~ 11 0
43 ISO-LHDS J105113+572655 rG 10 51 13.383 +57 26 55.25           ~ 3 0
44 FIRST J105114.9+573552 rG 10 51 15.0 +57 35 52           ~ 10 1
45 [DZP97] 44 Rad 10 51 17.631 +57 16 39.33       21.68   ~ 3 0
46 [DZP97] 47a Rad 10 51 19.76 +57 10 09.5           ~ 1 0
47 [DZP97] 47 rG 10 51 20.3 +57 09 51           ~ 2 0
48 [DZP97] 45 Rad 10 51 20.37 +57 22 53.1           ~ 2 0
49 [DZP97] 47b Rad 10 51 20.40 +57 09 51.8           ~ 1 0
50 [DZP97] 48 Rad 10 51 20.818 +57 30 37.35       25.87   ~ 3 0
51 NVSS J105120+573538 Rad 10 51 20.843 +57 35 32.64       24.86   ~ 5 0
52 NVSS J105122+570854 rG 10 51 22.1 +57 08 55       24.83   ~ 10 1
53 10C J105123+573229 AG? 10 51 22.9206 +57 32 28.518       24.74   ~ 6 1
54 LEDA 2568498 LIN 10 51 25.6803203232 +57 35 44.114215704           ~ 12 0
55 SWIRE J105125.89+572154.5 rG 10 51 25.89 +57 21 54.5           ~ 2 0
56 LHW J105129+571148A Rad 10 51 27.90 +57 12 19.3           ~ 2 0
57 NVSS J105127+570859 rG 10 51 28.0 +57 09 02       20.19   ~ 8 1
58 [DZP97] 53 Rad 10 51 28.05 +57 39 25.2           ~ 1 0
59 2MASS J10512806+5735025 rG 10 51 28.0782706224 +57 35 02.482737648           ~ 18 0
60 [DZP97] 57 Rad 10 51 30.03 +57 11 44.3           ~ 1 0
61 AzTEC J105130.29+573807.2 smm 10 51 30.4824 +57 38 08.628           ~ 6 0
62 NVSS J105133+571104 rG 10 51 32.3486164776 +57 11 15.508817484       18.94   ~ 11 1
63 [DZP97] 58 Rad 10 51 34.123 +57 09 22.10       21.69   ~ 3 0
64 ISO-LHDS J105135+572738 rG 10 51 35.72 +57 27 40.4     22.8     ~ 4 0
65 ISO-LHDS J105135+572959 rG 10 51 35.984 +57 29 59.86           ~ 3 0
66 LHW J105136+573302 Rad 10 51 36.33 +57 33 03.6           ~ 5 0
67 AzTEC J105136.91+573758.1 smm 10 51 36.9192 +57 37 51.751           ~ 4 0
68 NVSS J105138+572942 rG 10 51 36.9288 +57 29 40.384           ~ 9 1
69 LHW J105139+573045 Rad 10 51 39.09 +57 30 43.4           ~ 3 0
70 ISO-LHDS J105141+571953 rG 10 51 41.196 +57 19 53.12           ~ 19 0
71 NVSS J105142+573601 Rad 10 51 41.9 +57 36 04           ~ 3 1
72 XMMU J105142.1+573449 rG 10 51 42.0 +57 34 47       21.69   ~ 10 0
73 ISO-LHDS J105142+571503 rG 10 51 42.063 +57 15 03.95           ~ 3 0
74 LEDA 3408072 LIN 10 51 43.7554425768 +57 29 36.865226040           ~ 13 0
75 NVSS J105144+573313 rG 10 51 44.155 +57 33 14.19           ~ 7 1
76 ISO-LHDS J105144+571720 rG 10 51 44.428 +57 17 20.51           ~ 3 0
77 SDSS J105148.73+573248.7 rG 10 51 48.732 +57 32 48.71     23.2 22.90   ~ 28 0
78 [CZH2003] LOCK-6cm J105150+572635 Rad 10 51 50.12 +57 26 35.5     25.4 24.77   ~ 5 0
79 NVSS J105152+570948 Rad 10 51 52.4 +57 09 50       22.51   ~ 5 1
80 LHW J105150+573244D Rad 10 51 55.20 +57 32 11.6           ~ 2 0
81 [CZH2003] LOCK-6cm J105158+572330 Rad 10 51 58.97 +57 23 30.4     25.5 26.02   ~ 4 0
82 [LGE2006] 12 Sy1 10 52 00.11 +57 24 23.5     22.4     ~ 17 0
83 AzTEC J105201.98+574049.3 rG 10 52 01.98 +57 40 49.3           ~ 10 0
84 NVSS J105206+574108 rG 10 52 06.5 +57 41 10       24.24   ~ 11 2
85 SDSS J105207.14+570745.7 rG 10 52 07.146 +57 07 45.73           ~ 9 0
86 NAME SMM J105207.49+571904.0 rG 10 52 07.490 +57 19 04.01   25.89   25.62 25.27 ~ 39 0
87 [DZP97] 80 Rad 10 52 10.58 +57 12 03.7           ~ 2 0
88 [CZH2003] LOCK-6cm J105211+572907 AG? 10 52 10.9653 +57 29 08.569     25.5 25.51   ~ 6 0
89 [DZP97] 82 Rad 10 52 12.14 +57 15 48.0           ~ 1 0
90 ISO-LHDS J105212+572453 rG 10 52 12.577 +57 24 53.24     21.6     ~ 5 0
91 ISO-LHDS J105213+571605 rG 10 52 13.475 +57 16 05.03           ~ 5 0
92 [CZH2003] LOCK-6cm J105216+573529 rG 10 52 16.61 +57 35 30.0     18.7     ~ 3 0
93 ISO-LHDS J105217+572127 rG 10 52 17.72 +57 21 27.1           ~ 6 0
94 LHW J105224+570839 rG 10 52 24.01 +57 08 42.1           ~ 4 0
95 ISO-LHDS J105225+571130 rG 10 52 25.5835517308 +57 11 31.400346004           ~ 5 0
96 NVSS J105225+573324 rG 10 52 25.6 +57 33 22     21.3     ~ 10 1
97 [DZP97] 90 Rad 10 52 25.70 +57 22 47.0           ~ 1 0
98 [DZP97] 91 Rad 10 52 26.70 +57 27 59.3           ~ 1 0
99 [DZP97] 92 Rad 10 52 29.47 +57 12 40.1           ~ 1 0
100 LHW J105231+570848A Rad 10 52 30.53 +57 08 53.1           ~ 3 0
101 [DZP97] 93 Rad 10 52 30.615 +57 13 12.36       21.51   ~ 3 0
102 [CZH2003] LOCK-6cm J105231+573501 rG 10 52 31.08 +57 35 01.4     21.2     ~ 3 0
103 SWIRE J105231.81+570650.4 rG 10 52 31.81 +57 06 50.4       19.82   ~ 4 0
104 LHW J105231+570848B Rad 10 52 32.40 +57 08 42.0           ~ 3 0
105 LHW J105235+572649 Rad 10 52 35.60 +57 26 53.4           ~ 2 0
106 [DZP97] 99a Rad 10 52 36.50 +57 30 48.8           ~ 1 0
107 RDS 116 rG 10 52 37.0 +57 30 58     21.8     ~ 11 0
108 NVSS J105237+573101 rG 10 52 37.355 +57 31 03.76       21.25   ~ 19 1
109 [DZP97] 99b Rad 10 52 38.08 +57 31 16.3           ~ 1 0
110 [VV98] J105239.6+572432 QSO 10 52 39.5958253296 +57 24 31.425574788   18.39 18.07     ~ 76 0
111 FIRST J105241.4+572320 Rad 10 52 41.4 +57 23 21     23.3 22.93   ~ 7 1
112 2MASS J10524240+5724447 rG 10 52 42.391 +57 24 44.84           ~ 4 0
113 SDSS J105242.41+571914.5 rG 10 52 42.4224959376 +57 19 14.603499264     18.0     ~ 16 0
114 10C J105245+573617 rG 10 52 45.2 +57 36 16     21.8 21.25   ~ 6 1
115 2MASS J10525274+5728596 Sy2 10 52 52.7604722568 +57 28 59.623234140     17.8     ~ 23 0
116 SDSS J105252.77+570753.8 rG 10 52 52.7882900712 +57 07 53.901172128           ~ 15 0
117 [DZP97] 107 Rad 10 52 53.36 +57 27 00.8           ~ 1 0
118 [DZP97] 108 Rad 10 52 53.86 +57 18 23.6           ~ 1 0
119 NVSS J105254+571950 rG 10 52 55.3254 +57 19 50.471     24.6 23.88   ~ 15 1
120 LHW J105256+572400 rG 10 52 56.77 +57 23 59.6   23.66   23.01 22.46 ~ 5 0
121 [DZP97] 111a Rad 10 52 56.79 +57 08 25.1           ~ 1 0
122 LHW J105257+570829 Rad 10 52 57.30 +57 08 29.6           ~ 2 0
123 ISO-LHDS J105257+571515 rG 10 52 57.655 +57 15 15.80           ~ 2 0
124 [DZP97] 111b Rad 10 52 57.73 +57 08 34.9           ~ 1 0
125 10C J105300+573216 Rad 10 52 59.3 +57 32 26     25.5     ~ 4 1
126 2MASS J10530133+5705433 rG 10 53 01.3561774608 +57 05 43.088623584           ~ 15 0
127 [CZH2003] LOCK-6cm J105301+572521 Rad 10 53 01.69 +57 25 21.2     22.9     ~ 3 0
128 RDS 827 Sy2 10 53 03.53 +57 35 29.5     22.0     ~ 6 0
129 SDSS J105303.71+571205.5 QSO 10 53 03.7234529544 +57 12 05.584137588           ~ 11 0
130 [DZP97] 118 Rad 10 53 04.490 +57 15 47.64       24.07   ~ 3 0
131 [CZH2003] LOCK-6cm J105304+573055 Rad 10 53 04.787 +57 30 56.09     22.2     ~ 5 0
132 [VV98] J105307.4+571505 QSO 10 53 07.3241878632 +57 15 04.632919200     20.30     ~ 24 0
133 [CZH2003] LOCK-6cm J105308+572223 Rad 10 53 08.09 +57 22 23.0     20.8 20.03   ~ 4 0
134 LHW J105308+571658 Rad 10 53 08.10 +57 16 58.5           ~ 2 0
135 LHW J105309+573712 Rad 10 53 09.52 +57 37 12.2           ~ 3 0
136 LHW J105309+570637 Rad 10 53 09.54 +57 06 36.8           ~ 3 0
137 LHW J105312+571107 Rad 10 53 12.23 +57 11 05.8           ~ 3 0
138 LHW J105312+573111 Rad 10 53 12.70 +57 31 11.9     24.6     ~ 4 0
139 ISO-LHDS J105314+573021 rG 10 53 14.378 +57 30 21.49     24.4     ~ 5 0
140 [VV98] J105316.9+573552 QSO 10 53 16.7644541304 +57 35 50.730680004   19.97 19.47     ~ 69 0
141 2MASS J10531899+5721394 rG 10 53 18.953 +57 21 40.46           ~ 12 0
142 SDSS J105319.02+571851.8 rG 10 53 19.023 +57 18 51.81     21.3 20.84   ~ 19 0
143 SWIRE J105319.54+571245.9 rG 10 53 19.54 +57 12 45.9           ~ 2 0
144 LHW J105322+571501 Rad 10 53 22.82 +57 15 00.2           ~ 3 0
145 LHW J105324+571658 Rad 10 53 24.62 +57 16 58.1           ~ 3 0
146 ISO-LHDS J105325+572909 rG 10 53 25.217 +57 29 09.08     17.9     ~ 8 0
147 LHW J105326+571406 Rad 10 53 26.70 +57 14 05.3           ~ 3 0
148 [DZP97] 136 Rad 10 53 27.51 +57 09 31.7           ~ 1 0
149 LHW J105328+571115 Rad 10 53 27.96 +57 11 15.6           ~ 3 0
150 [CZH2003] LOCK-6cm J105335+572921 Rad 10 53 35.18 +57 29 21.3     23.3     ~ 3 0
151 [DZP97] 139 Rad 10 53 40.73 +57 26 27.0           ~ 1 0
152 SDSS J105340.86+571917.6 rG 10 53 40.86224 +57 19 17.6887           ~ 5 0
153 FIRST J105340.8+571952 rG 10 53 40.8986 +57 19 53.282       23.09   ~ 9 1
154 LHW J105342+573026 Rad 10 53 42.08 +57 30 26.5     25.5     ~ 4 0
155 LHW J105343+572531 rG 10 53 43.25 +57 25 29.9           ~ 4 0
156 LHW J105348+571740 Rad 10 53 47.90 +57 17 41.4           ~ 2 0
157 [DZP97] 145 Rad 10 53 56.461 +57 22 44.82       25.29   ~ 3 0
158 NVSS J105400+573322 rG 10 54 00.486 +57 33 21.17       26.04   ~ 12 1
159 [DZP97] 147 Rad 10 54 06.08 +57 24 13.4           ~ 2 0
160 NVSS J105407+571307 Rad 10 54 06.741 +57 12 55.89           ~ 3 0
161 2MASS J10542112+5725431 Sy1 10 54 21.1984001400 +57 25 44.284004364       18.80   ~ 47 1
162 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2

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