2013AJ....146...10T

Query : 2013AJ....146...10T

2013AJ....146...10T - Astron. J., 146, 10 (2013/July-0)

Optical spectra of candidate International Celestial Reference Frame (ICRF) flat-spectrum radio sources.

TITOV O., STANFORD L.M., JOHNSTON H.M., PURSIMO T., HUNSTEAD R.W., JAUNCEY D.L., MASLENNIKOV K. and BOLDYCHEVA A.

Abstract (from CDS):

Continuing our program of spectroscopic observations of International Celestial Reference Frame (ICRF) sources, we present redshifts for 120 quasars and radio galaxies. Data were obtained with five telescopes: the 3.58 m European Southern Observatory New Technology Telescope, the two 8.2 m Gemini telescopes, the 2.5 m Nordic Optical Telescope (NOT), and the 6.0 m Big Azimuthal Telescope of the Special Astrophysical Observatory in Russia. The targets were selected from the International VLBI Service for Geodesy & Astrometry candidate International Celestial Reference Catalog which forms part of an observational very long baseline interferometry (VLBI) program to strengthen the celestial reference frame. We obtained spectra of the potential optical counterparts of more than 150 compact flat-spectrum radio sources, and measured redshifts of 120 emission-line objects, together with 19 BL Lac objects. These identifications add significantly to the precise radio-optical frame tie to be undertaken by Gaia, due to be launched in 2013, and to the existing data available for analyzing source proper motions over the celestial sphere. We show that the distribution of redshifts for ICRF sources is consistent with the much larger sample drawn from Faint Images of the Radio Sky at Twenty cm (FIRST) and Sloan Digital Sky Survey, implying that the ultra-compact VLBI sources are not distinguished from the overall radio-loud quasar population. In addition, we obtained NOT spectra for five radio sources from the FIRST and NRAO VLA Sky Survey catalogs, selected on the basis of their red colors, which yielded three quasars with z > 4.

Abstract Copyright: ∼

Journal keyword(s): BL Lacertae objects: general - galaxies: active - quasars: emission lines - radio continuum: general - reference systems

VizieR on-line data: <Available at CDS (J/AJ/146/10): table1.dat table2.dat table3.dat notes.dat>

Simbad objects: 164

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Number of rows : 164
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 ICRF J002524.2-222747 QSO 00 25 24.24740654 -22 27 47.5964258       18.73   ~ 24 1
2 NAME SMC B0026-7101 Bla 00 28 41.5636966584 -70 45 15.927580080       16.62   ~ 51 1
3 9C J0034+2754 QSO 00 34 43.4862800448 +27 54 25.717898772   18.0   17.87   ~ 40 1
4 QSO B0044-846 Bla 00 44 26.68923207 -84 22 39.9875303     18.5 17.8   ~ 67 1
5 IVS B0205-619 Bla 02 06 40.00305 -61 43 32.2067           ~ 12 1
6 PKS J0207-2402 Rad 02 07 33.3995950728 -24 02 02.203041156           ~ 14 1
7 ICRF J020801.1-621635 Bla 02 08 01.1713426080 -62 16 35.533011756           ~ 14 1
8 ICRF J021605.6-011803 QSO 02 16 05.6637733800 -01 18 03.393275508           ~ 27 1
9 QSO B0219-637 QSO 02 20 54.1703438112 -63 30 19.387256904   18.5 18.5 19.25   ~ 28 1
10 ICRF J022833.7-371956 QSO 02 28 33.7337099112 -37 19 56.365464180           ~ 16 1
11 PKS 0227-542 rG 02 29 12.78530889 -54 03 24.0345774           ~ 16 0
12 AT20G J023506-473710 Bla 02 35 06.4239059832 -47 37 10.575291216           ~ 17 1
13 SDSS J024649.12-045111.0 QSO 02 46 49.1309053008 -04 51 10.930240656           ~ 10 1
14 QSO B0253-754 QSO 02 53 10.8834157152 -75 13 16.704176736   19.0       ~ 13 1
15 QSO B0301-721 QSO 03 01 38.4459014592 -71 56 34.399897008           ~ 52 1
16 ICRF J031527.6-165629 BLL 03 15 27.67841142 -16 56 29.7144066       19.41   ~ 30 0
17 ICRF J032046.4-383728 QSO 03 20 46.40435596 -38 37 28.4965492           ~ 24 1
18 ICRF J032128.7-312256 QSO 03 21 28.7404387584 -31 22 56.338094064     19.0     ~ 23 1
19 ICRF J032159.8-052612 QSO 03 21 59.87035778 -05 26 12.4284423   18.0   18.8   ~ 26 1
20 QSO B0334-546 QSO 03 35 53.92483282 -54 30 25.1149291   20.0 20.0 17.78   ~ 46 1
21 PKS J0341-5954 Bla 03 41 21.6143958696 -59 54 08.911278828           ~ 14 1
22 ICRF J034423.1+155943 QSO 03 44 23.17215743 +15 59 43.3691667           ~ 37 1
23 ICRF J034711.6+484237 Bla 03 47 11.61335546 +48 42 37.4733046           ~ 12 0
24 ICRF J035025.0+513838 Bla 03 50 25.05141901 +51 38 38.7345036           ~ 17 1
25 QSO B0355-669 QSO 03 55 47.8826471232 -66 45 33.817113540   17.3       ~ 34 1
26 IVS B0412-779 Bla 04 10 42.3078521016 -77 50 43.300469832           ~ 6 0
27 QSO B0410-519 Bla 04 11 37.1499317880 -51 49 23.348533512     18.0     ~ 26 1
28 ICRF J041900.4-213235 QSO 04 19 00.4184523144 -21 32 35.673889380           ~ 20 1
29 IVS B0417-302 QSO 04 19 47.2049500608 -30 10 23.852974800   17.7   17.3   ~ 19 1
30 QSO B0418-151 QSO 04 20 18.39336683 -15 01 26.5765593     20.5     ~ 25 1
31 PMN J0431-0406 Bla 04 31 28.08855085 -04 06 27.3197405           ~ 21 1
32 QSO B0432-606 QSO 04 33 34.1084892864 -60 30 13.769648496     18.0     ~ 60 1
33 ICRF J043534.5+253259 Bla 04 35 34.58295312 +25 32 59.6985423           ~ 32 1
34 ICRF J043953.2-301745 QSO 04 39 53.2011193776 -30 17 45.624592500           ~ 21 1
35 ACT-S J044821-504140 Bla 04 48 22.3029039600 -50 41 33.832032540           ~ 12 1
36 ICRF J044823.9-262614 QSO 04 48 23.9641017384 -26 26 14.837848728           ~ 18 1
37 AT20G J044939-480940 Bla 04 49 39.5902114632 -48 09 40.709441880       18.99   ~ 15 1
38 QSO B0450-469 Bla 04 51 53.3468902656 -46 53 19.894609392   19.0 19.0     ~ 32 1
39 ICRF J045754.3-181916 QSO 04 57 54.3252074520 -18 19 16.073726628       17.03   ~ 29 1
40 QSO J0501+1356 Bz? 05 01 45.27082298 +13 56 07.2203444       22.22   ~ 40 1
41 QSO B0503-608 QSO 05 04 01.70113441 -60 49 52.5395511     19.5     ~ 36 1
42 ICRF J051340.0+010021 QSO 05 13 40.0322176080 +01 00 21.656092284           ~ 28 1
43 QSO B0516-621 BLL 05 16 44.92617055 -62 07 05.3894029 18.50 18.09 17.85 17.46   ~ 139 1
44 ICRF J051657.1-153710 QSO 05 16 57.1850698704 -15 37 10.372943892           ~ 14 0
45 ICRF J051728.1-052040 QSO 05 17 28.1103112464 -05 20 40.837981488           ~ 41 1
46 ICRF J052123.5-173730 BLL 05 21 23.5579026408 -17 37 30.185353524       17.77   ~ 64 1
47 ICRF J052244.6-162752 BLL 05 22 44.6547228744 -16 27 52.405750188           ~ 23 1
48 QSO B0521-262 QSO 05 23 18.4698419808 -26 14 09.551529060   18.5       ~ 36 1
49 QSO B0524-485 Bla 05 26 16.67131784 -48 30 36.7919695     20.0 19.36   ~ 107 1
50 ICRF J053207.5-030707 Bla 05 32 07.51932634 -03 07 07.0365011           ~ 31 1
51 ACT-S J054943-524629 Bla 05 49 43.8053237400 -52 46 25.959251244           ~ 18 1
52 QSO J0557+2413 QSO 05 57 04.71357870 +24 13 55.2986106           ~ 42 1
53 ICRF J060147.3+232453 Bla 06 01 47.35700965 +23 24 53.4858612           ~ 17 1
54 ICRF J060148.7-273622 Bla 06 01 48.7201973376 -27 36 22.031465040           ~ 13 1
55 ICRF J060152.8-200445 Bla 06 01 52.8262928112 -20 04 45.210621360       19.8   ~ 21 1
56 4C 22.12 BLL 06 03 51.55701163 +21 59 37.6988226           ~ 42 1
57 4C 24.11 QSO 06 04 55.12138831 +24 29 55.0364698           ~ 40 1
58 ICRF J061017.8-184740 Bla 06 10 17.8858288680 -18 47 40.089141708       17.29   ~ 54 1
59 ICRF J061038.7-230145 QSO 06 10 38.7873548352 -23 01 45.833906280           ~ 24 0
60 ICRF J062228.5-192718 QSO 06 22 28.53712460 -19 27 18.1838590           ~ 16 1
61 ICRF J062857.4-624844 BLL 06 28 57.48785095 -62 48 44.7441689           ~ 52 1
62 ICRF J063519.4-262055 rG 06 35 19.41625571 -26 20 55.7185603           ~ 5 0
63 ICRF J063520.9-262039 BLL 06 35 20.90901935 -26 20 39.8696450       19.08   ~ 19 0
64 AT20G J064246-615009 Bla 06 42 46.9989870168 -61 50 08.671078968           ~ 13 1
65 AT20G J065813-584027 Bla 06 58 13.7774426424 -58 40 27.620598252           ~ 36 1
66 2MASS J07003124-6610452 BLL 07 00 31.2536435688 -66 10 45.229749384 16.38 15.99 15.89     ~ 86 3
67 PMN J0705-6500 rG 07 05 26.0522935200 -65 00 43.477269768           ~ 9 1
68 AT20G J071904-621802 Bla 07 19 04.4755367472 -62 18 02.445017832           ~ 16 1
69 PMN J0719-5228 rG 07 19 14.2953290832 -52 28 32.562973308           ~ 13 2
70 PKS J0723-8247 rG 07 23 39.40623 -82 47 41.0889           ~ 11 1
71 ICRF J072917.8-132002 BLL 07 29 17.8177224648 -13 20 02.273770824           ~ 27 1
72 ICRF J073038.2-320820 Q? 07 30 38.29838806 -32 08 20.1792305   19       ~ 19 1
73 ICRF J074618.2-155534 BLL 07 46 18.2363814576 -15 55 34.745691432           ~ 27 1
74 ICRF J075110.2-004651 QSO 07 51 10.2056872872 -00 46 51.057719904     20.5     ~ 17 1
75 ICRF J075426.4-114716 BLL 07 54 26.4562390440 -11 47 16.944994572       18.2   ~ 72 1
76 ICRF J075650.6-154205 QSO 07 56 50.69896628 -15 42 05.4365824   18.92       ~ 25 1
77 NVSS J080433-171204 rG 08 04 33.7149332472 -17 12 03.876337944           ~ 15 1
78 ICRF J080709.6-054113 BLL 08 07 09.6177668856 -05 41 13.915572108     19.5     ~ 72 1
79 QSO B0810-180 QSO 08 12 28.5149899488 -18 10 42.809612592     18.5     ~ 23 1
80 ICRF J081749.7-093330 BLL 08 17 49.7493705648 -09 33 30.523860972 18.38 17.96 17.61 17.51   ~ 82 1
81 ICRF J082352.0-093925 QSO 08 23 52.0225983048 -09 39 25.899584760           ~ 16 1
82 ICRF J083049.7-063619 Bla 08 30 49.7440490088 -06 36 19.991195496           ~ 16 1
83 ICRF J083109.1-222826 QSO 08 31 09.1492123368 -22 28 26.797225656           ~ 20 1
84 PKS J0833-7305 QSO 08 33 43.1436286344 -73 05 26.204213148           ~ 14 1
85 AT20G J084549-555528 Bla 08 45 49.6809884664 -55 55 26.737994172           ~ 31 0
86 ICRF J090144.2-070216 Bla 09 01 44.2396485240 -07 02 16.066308552           ~ 18 1
87 PMN J0907-2026 rG 09 07 54.04044022 -20 26 49.4749546       15.29   ~ 29 1
88 QSO B0909-745 QSO 09 09 20.9441048184 -74 45 08.150145480   21.0       ~ 17 1
89 AT20G J092142-820936 Bla 09 21 42.69766 -82 09 36.2197           ~ 10 1
90 ICRF J093219.5-201637 QSO 09 32 19.5865993536 -20 16 37.210232316           ~ 26 1
91 AT20G J094155-861502 Bla 09 41 55.61531 -86 15 01.8171       19.00   ~ 9 0
92 ICRF J094221.4-075953 BLL 09 42 21.4615245552 -07 59 53.204006544       17.91   ~ 72 1
93 ICRF J095231.6-245350 Bla 09 52 31.65445876 -24 53 50.8871557           ~ 24 1
94 ICRF J095505.0+483819 Bla 09 55 05.00133606 +48 38 19.0411868           ~ 17 1
95 ICRF J095514.6-184531 Bla 09 55 14.6807169984 -18 45 31.864196592           ~ 15 1
96 ICRF J095838.2-411033 QSO 09 58 38.2959896760 -41 10 33.174701688           ~ 18 0
97 ICRF J100604.1-740944 QSO 10 06 04.14530985 -74 09 44.0875466   20.1       ~ 22 1
98 QSO B1004-125 QSO 10 07 15.22772619 -12 47 45.9943517           ~ 27 1
99 ICRF J101224.0-374005 QSO 10 12 24.0749888424 -37 40 05.907078876           ~ 19 1
100 QSO J1013+2811 QSO 10 13 35.49 +28 11 18.3           ~ 5 0
101 ICRF J101552.2-195226 Bla 10 15 52.2528009432 -19 52 26.565718872   18.0   17.8   ~ 15 0
102 7C 1020+2704 Bla 10 23 11.1026 +26 49 41.696           ~ 10 2
103 ICRF J102545.4-050954 QSO 10 25 45.42296693 -05 09 54.1321755       19.81   ~ 28 1
104 ICRF J103647.5-060541 Bla 10 36 47.57302393 -06 05 41.1848346       20.84   ~ 25 0
105 ICRF J103739.3+042401 QSO 10 37 39.33956631 +04 24 01.7465044           ~ 37 1
106 ICRF J104144.6-474000 Bla 10 41 44.6497625760 -47 40 00.065221860           ~ 23 1
107 ICRF J105811.0-030927 Bla 10 58 11.01070384 -03 09 27.2548300           ~ 17 1
108 ICRF J110511.0-392842 QSO 11 05 11.0808814296 -39 28 42.155410584           ~ 21 1
109 ICRF J110725.8+521931 QSO 11 07 25.8280609200 +52 19 31.634990112           ~ 35 1
110 ICRF J111820.6-305458 QSO 11 18 20.6101322712 -30 54 58.528439748     18.5     ~ 19 1
111 ICRF J112038.4+070447 QSO 11 20 38.44359842 +07 04 47.1724558           ~ 70 1
112 ICRF J112143.1-044236 QSO 11 21 43.11429744 -04 42 36.1512722           ~ 18 1
113 ICRF J112402.5-150158 QSO 11 24 02.56561896 -15 01 58.9491926           ~ 26 1
114 NVSS J112424+655501 rG 11 24 24.66598989 +65 55 01.3818157           ~ 14 1
115 ICRF J112531.4-355703 BLL 11 25 31.4816766288 -35 57 03.352306356       16.3   ~ 69 1
116 ICRF J112931.7-443549 Bla 11 29 31.72195483 -44 35 49.9385266       19.00   ~ 13 0
117 ICRF J113136.7-162833 Bla 11 31 36.74794062 -16 28 33.4366419           ~ 14 1
118 ICRF J113335.9-090523 Bla 11 33 35.99283390 -09 05 23.4019812           ~ 19 1
119 QSO B1134-739 QSO 11 36 09.6574251768 -74 15 45.262662732   21.5       ~ 52 1
120 ICRF J114553.6-695401 Bla 11 45 53.6240870832 -69 54 01.798095240   16.90       ~ 71 1
121 NVSS J115510+455539 rG 11 55 11.0081 +45 55 39.624           ~ 18 1
122 NVSS J122554+445622 rG 12 25 54.619 +44 56 23.01           ~ 5 1
123 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
124 6C 124133+405850 Bla 12 43 55.7816 +40 43 58.435           ~ 19 1
125 SDSS J125944.55+240708.3 QSO 12 59 44.5545390456 +24 07 08.384391660           ~ 10 0
126 7C 133822.60+361534.00 Bla 13 40 36.0124 +36 00 26.738           ~ 17 1
127 ICRF J142741.3-330531 BLL 14 27 41.3611529328 -33 05 31.504402104       17.48   ~ 73 1
128 ICRF J144851.1-112215 QSO 14 48 51.1602316296 -11 22 15.731746968           ~ 25 1
129 QSO J1454+1109 QSO 14 54 59.31 +11 09 27.9           ~ 6 0
130 ICRF J153516.5+195450 QSO 15 35 16.53388222 +19 54 50.9078442           ~ 26 1
131 7C 160716.00+562137.00 QSO 16 08 20.7524770080 +56 13 56.367169140           ~ 27 1
132 QSO J1628+1154 QSO 16 28 30.480 +11 54 03.66           ~ 5 0
133 SDSS J163131.71+502822.5 Bla 16 31 31.6975094328 +50 28 22.527983964           ~ 16 0
134 SDSS J163400.28+640822.1 QSO 16 34 00.2893842408 +64 08 22.142325156           ~ 3 0
135 ICRF J164435.7-180432 QSO 16 44 35.7463212624 -18 04 32.461859208       18.57   ~ 31 1
136 6C 172202+561358 Bla 17 22 58.0033696104 +56 11 22.323378912           ~ 10 1
137 LCS1 J1749-6258 Bla 17 49 25.7098188648 -62 58 18.950734128           ~ 11 1
138 QSO B1821-525 QSO 18 25 13.8085148136 -52 30 58.288523544   19.2       ~ 53 1
139 PMN J1925-2219 rG 19 25 39.79018461 -22 19 35.1126221       16.52   ~ 27 1
140 ICRF J194559.3-311138 BLL 19 45 59.3693071560 -31 11 38.356706724       18   ~ 56 1
141 ICRF J195441.1-112322 BLL 19 54 41.15572923 -11 23 22.6421728       19.02   ~ 108 1
142 ICRF J202332.8-012342 QSO 20 23 32.81636666 -01 23 42.1533945       18.41   ~ 25 1
143 ICRF J202553.6-284548 QSO 20 25 53.61284023 -28 45 48.6983395       17.70   ~ 60 1
144 ICRF J203900.7-104641 BLL 20 39 00.7103307384 -10 46 41.863534320 17.24 16.95 16.69 19.0   ~ 72 1
145 9Y-MST J2109-6638 BLL 21 08 51.8208584088 -66 37 22.748840004 18.57 18.27 18.32     ~ 52 1
146 ICRF J211022.6-012658 Bla 21 10 22.61906851 -01 26 58.2420208           ~ 22 1
147 ICRF J211629.8-552720 Bla 21 16 29.8165636296 -55 27 20.438804808       19.06   ~ 13 0
148 ICRF J214721.8-062025 Bla 21 47 21.8898139704 -06 20 25.340965548           ~ 21 2
149 QSO B2142-765 QSO 21 47 53.1516385032 -76 21 29.218486392   16       ~ 13 1
150 ICRF J220330.4+715108 BLL 22 03 30.4667166648 +71 51 08.536272732           ~ 22 1
151 QSO B2201-778 QSO 22 06 44.4597169224 -77 35 23.761857156   18.9       ~ 11 0
152 PKS J2239-5525 Bla 22 39 06.0345828912 -55 25 59.407423140           ~ 15 1
153 PMN J2243-0608 rG 22 43 08.76075171 -06 09 02.5672891           ~ 19 1
154 PKS J2254-5925 Bla 22 54 56.8296390408 -59 26 00.691289736           ~ 14 1
155 ICRF J225610.6+230145 QSO 22 56 10.6749887784 +23 01 45.177610080           ~ 22 1
156 2MASS J22562486-6533258 Bla 22 56 24.8719350360 -65 33 25.649221536           ~ 16 1
157 AT20G J230305-303011 Q? 23 03 05.82082499 -30 30 11.4734219     16     ~ 22 1
158 ICRF J230601.2+083715 Bla 23 06 01.2716977368 +08 37 15.383362296           ~ 16 0
159 AT20G J231258-660731 Bla 23 12 58.8400651488 -66 07 31.735145388           ~ 12 1
160 9Y-MST J2328-4036 QSO 23 28 19.2647388192 -40 35 09.848817024   19.5 18.5     ~ 61 1
161 QSO B2334-525 QSO 23 37 23.1669143688 -52 16 20.123802804   18.9       ~ 17 1
162 ICRF J234422.5+295220 Bla 23 44 22.5531144792 +29 52 20.702054064   19.4       ~ 30 1
163 ICRF J235828.8+043024 QSO 23 58 28.84696868 +04 30 24.8362936           ~ 36 1
164 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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