2005AJ....130..923W

Query : 2005AJ....130..923W

2005AJ....130..923W - Astron. J., 130, 923-935 (2005/September-0)

Faint radio sources in the NOAO Bootes field: VLBA imaging and optical identifications.

WROBEL J.M., TAYLOR G.B., RECTOR T.A., MYERS S.T. and FASSNACHT C.D.

Abstract (from CDS):

As a step toward investigating the parsec-scale properties of faint extragalactic radio sources, the Very Long Baseline Array (VLBA) was used at 5.0 GHz to obtain phase-referenced images of 76 sources in the NOAO Boötes field. These 76 sources were selected from the Faint Images of the Radio Sky at Twenty cm (FIRST) catalog to have peak flux densities above 10 mJy at 5" resolution and deconvolved major diameters of less than 3" at 1.4 GHz. Of these faint radio sources, 57 were identified with accretion-powered radio galaxies and quasars brighter than 25.5 mag in the optical I band. On Very Large Array (VLA) scales at 1.4 GHz, a measure of the compactness of the faint sources (the ratio of the peak flux density from FIRST to the integrated flux density from the NRAO VLA Sky Survey catalog) spans the full range of possibilities arising from source-resolution effects. Of the faint radio sources, 30, or 39+9–7%, were detected with the VLBA at 5.0 GHz with peak flux densities above 6 σ∼2 mJy at 2 mas resolution. The VLBA detections occur through the full range of compactness ratios. The stronger VLBA detections can themselves serve as phase-reference calibrators, boding well for opening up much of the radio sky to VLBA imaging. For the adopted cosmology, the VLBA resolution corresponds to 17 pc or finer. Most VLBA detections are unresolved or slightly resolved, but one is diffuse and five show either double or core-jet structures; the properties of these latter six are discussed in detail. Three VLBA detections are unidentified and fainter than 25.5 mag in the optical I band; their properties are highlighted because they likely mark optically obscured active nuclei at high redshift.

Abstract Copyright: ∼

Journal keyword(s): Astrometry - Galaxies: Active - Radio Continuum: Galaxies - Surveys

VizieR on-line data: <Available at CDS (J/AJ/130/923): table1.dat notes.dat>

CDS comments: table 2 : calibrator F14543631 not identified. Is probably IRAS F14306+3631.

Simbad objects: 81

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Number of rows : 81
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 7C 1413+3458 Bz? 14 16 04.18619489 +34 44 36.4264542           ~ 102 1
2 6C 142016+323628 Bla 14 22 30.3788624376 +32 23 10.440862980   19.33 19.16 19.11   ~ 196 1
3 SDSS J142456.30+352841.8 QSO 14 24 56.3045885376 +35 28 41.747232900       20.54 19.79 ~ 5 1
4 6C 142310+350605 QSO 14 25 16.5184785456 +34 52 46.553885328       21.06 20.53 ~ 18 1
5 NVSS J142517+341559 Rad 14 25 17.227 +34 15 59.33           ~ 2 1
6 SDSS J142524.22+340935.9 QSO 14 25 24.2200019784 +34 09 35.883047160       19.68 19.38 ~ 10 1
7 NVSS J142543+335534 Rad 14 25 43.885 +33 55 33.24           ~ 3 1
8 87GB 142357.8+341753 BLL 14 26 07.7161839912 +34 04 26.325178284   17.99 17.51 17.38 17.12 ~ 78 2
9 NVSS J142617+344039 Rad 14 26 17.948 +34 40 39.63           ~ 1 0
10 NVSS J142623+343950 Rad 14 26 23.374 +34 39 50.45           ~ 1 0
11 NVSS J142632+350815 Rad 14 26 32.2 +35 08 15           ~ 3 1
12 NVSS J142636+362509 Bla 14 26 37.08750155 +36 25 09.5735425   20.44 19.93 20.27   ~ 92 1
13 NVSS J142659+341200 rG 14 26 59.6153352792 +34 11 59.671486176       15.14 14.34 ~ 17 0
14 NVSS J142701+330524 rG 14 27 01.644 +33 05 24.96       19.93 18.89 ~ 5 1
15 NVSS J142705+343629 Rad 14 27 05.073 +34 36 28.84           ~ 3 1
16 NVSS J142738+330756 Rad 14 27 38.625 +33 07 56.96           ~ 2 0
17 NVSS J142739+330744 Rad 14 27 39.7 +33 07 44           ~ 3 1
18 [VV2006] J142744.4+333828 QSO 14 27 44.4415767024 +33 38 28.602947220   19.23 18.91 18.79 19.01 ~ 37 1
19 NVSS J142755+332139 Rad 14 27 55.936 +33 21 39.92           ~ 4 1
20 [VV2006] J142758.8+324739 QSO 14 27 58.7263614216 +32 47 41.472982176   18.50 18.43 18.37 17.67 ~ 45 1
21 NVSS J142806+325935 Rad 14 28 06.696 +32 59 35.83           ~ 6 1
22 NVSS J142842+354326 rG 14 28 42.556 +35 43 26.60       20.91 19.88 ~ 6 1
23 NVSS J142904+343248 Rad 14 29 04.545 +34 32 43.54           ~ 3 1
24 NVSS J142905+342641 rG 14 29 05.105 +34 26 41.06       24.02 21.59 ~ 9 1
25 NVSS J142906+354234 Rad 14 29 06.607 +35 42 34.67           ~ 3 1
26 [VV2006] J142910.3+352946 QSO 14 29 10.2224077896 +35 29 46.891301280   19.66 19.35 18.76 18.35 ~ 48 1
27 NVSS J142911+333143 Rad 14 29 11.747 +33 31 44.24           ~ 4 1
28 NVSS J142937+344115 Rad 14 29 37.566 +34 41 15.69           ~ 1 0
29 NVSS J143008+344714 rG 14 30 08.885 +34 47 13.75       22.13 21.90 ~ 10 1
30 NVSS J143018+341610 Rad 14 30 18.550 +34 16 11.65           ~ 2 1
31 NVSS J143022+343727 Rad 14 30 22.337 +34 37 27.14           ~ 2 1
32 NVSS J143050+342614 Rad 14 30 50.912 +34 26 14.17           ~ 1 0
33 NVSS J143056+341930 Rad 14 30 56.092 +34 19 30.18           ~ 1 0
34 NVSS J143056+342722 Rad 14 30 56.256 +34 27 22.42           ~ 2 1
35 NVSS J143109+335301 rG 14 31 09.858 +33 53 01.67       21.64 20.43 ~ 5 1
36 NVSS J143114+343616 rG 14 31 14.097 +34 36 16.43       20.04 19.01 ~ 3 1
37 NVSS J143121+332808 Rad 14 31 21.320 +33 28 08.95           ~ 5 1
38 NVSS J143123+331625 Rad 14 31 23.297 +33 16 25.82           ~ 4 1
39 NVSS J143134+351509 rG 14 31 34.5 +35 15 11           ~ 4 1
40 NVSS J143152+340108 rG 14 31 52.544 +34 01 10.15       18.89 18.08 ~ 3 1
41 NVSS J143155+345926 Rad 14 31 55.856 +34 59 26.99           ~ 2 1
42 NVSS J143213+350941 Rad 14 32 13.543 +35 09 41.05           ~ 2 1
43 NVSS J143222+324939 Rad 14 32 22.785 +32 49 39.62           ~ 3 1
44 NVSS J143239+350151 rG 14 32 39.555 +35 01 51.23       18.15 17.43 ~ 11 1
45 NGC 5675 Sy2 14 32 39.82958858 +36 18 07.9327087   14.0       ~ 122 1
46 NVSS J143256+353339 Rad 14 32 56.072 +35 33 39.52           ~ 3 1
47 NVSS J143309+351520 Rad 14 33 09.89 +35 15 18.4           ~ 3 1
48 NVSS J143310+335828 rG 14 33 11.0816196672 +33 58 28.547385672       19.00 18.03 ~ 9 1
49 NVSS J143345+341149 Rad 14 33 45.947 +34 11 49.03           ~ 1 0
50 NVSS J143428+331102 Rad 14 34 28.007 +33 11 02.05           ~ 3 1
51 NVSS J143432+352141 Rad 14 34 32.836 +35 21 41.47           ~ 2 0
52 SDSS J143434.21+351009.4 QSO 14 34 34.2222124680 +35 10 09.429805920       19.90 18.90 ~ 20 1
53 NVSS J143435+352623 Rad 14 34 35.361 +35 26 22.26           ~ 2 1
54 87GB 143238.7+334221 BLL 14 34 45.3499816656 +33 28 20.566445664   19.73 19.01 16.90 16.18 ~ 28 1
55 NVSS J143446+332452 rG 14 34 46.5 +33 24 52       17.41 16.70 ~ 6 1
56 NVSS J143449+354246 rG 14 34 49.1023344072 +35 42 47.215558980       16.32 15.59 ~ 9 0
57 NVSS J143453+343626 Rad 14 34 53.497 +34 36 26.65           ~ 3 1
58 NVSS J143507+331933 Rad 14 35 07.129 +33 19 33.55           ~ 2 1
59 NVSS J143525+325124 Rad 14 35 25.184 +32 51 24.06           ~ 2 1
60 NVSS J143528+331145 Rad 14 35 27.951 +33 11 45.46           ~ 3 1
61 SDSS J143528.39+331931.4 QSO 14 35 28.3945149456 +33 19 31.464962868       18.83 18.73 ~ 15 1
62 NVSS J143529+343422 rG 14 35 29.161 +34 34 22.94       20.75 19.87 ~ 5 1
63 NVSS J143539+344359 Rad 14 35 39.740 +34 43 59.55           ~ 3 1
64 NVSS J143543+353305 Rad 14 35 43.629 +35 33 05.02           ~ 3 1
65 NVSS J143643+352222 Rad 14 36 43.209 +35 22 22.98           ~ 3 1
66 NVSS J143647+331037 Rad 14 36 47.710 +33 10 37.66           ~ 3 1
67 SDSS J143713.56+350554.8 QSO 14 37 13.5684717408 +35 05 54.832526520       19.33 19.15 ~ 13 1
68 NVSS J143723+350734 rG 14 37 23.715 +35 07 34.69       20.97 20.16 ~ 9 2
69 FIRST J143728.4+331110 AG? 14 37 28.4120 +33 11 10.078           ~ 3 1
70 NVSS J143737+342006 rG 14 37 37.09176 +34 20 03.7777           ~ 3 1
71 NVSS J143739+325408 Rad 14 37 39.458 +32 54 08.08           ~ 4 1
72 NVSS J143752+351940 rG 14 37 52.050 +35 19 40.08           ~ 2 1
73 7C 1436+3418 QSO 14 38 11.063 +34 04 59.46       20.87 20.52 ~ 7 1
74 SDSS J143821.80+344000.9 QSO 14 38 21.8059587360 +34 40 00.922321236       20.37 20.18 ~ 18 1
75 NVSS J143841+335809 Rad 14 38 41.949 +33 58 09.48           ~ 2 1
76 NVSS J143850+340422 rG 14 38 50.26913 +34 04 20.2461           ~ 2 1
77 NVSS J143850+350021 Rad 14 38 50.280 +35 00 21.16           ~ 2 1
78 6C 143651+372332 Bla 14 38 53.61097349 +37 10 35.4166935       19.11   ~ 98 1
79 NVSS J143859+345309 Rad 14 38 59.469 +34 53 09.33           ~ 3 1
80 NVSS J143909+332102 rG 14 39 09.43232 +33 21 01.7511           ~ 4 1
81 NVSS J143916+344913 Rad 14 39 16.249 +34 49 12.09           ~ 4 1

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