2008ApJ...689..108L

Query : 2008ApJ...689..108L

2008ApJ...689..108L - Astrophys. J., 689, 108-126 (2008/December-2)

The micro-arcsecond scintillation-induced variability (MASIV) survey. II. The first four epochs.

LOVELL J.E.J., RICKETT B.J., MacQUART J.-P., JAUNCEY D.L., BIGNALL H.E., KEDZIORA-CHUDCZER L., OJHA R., PURSIMO T., DUTKA M., SENKBEIL C. and SHABALA S.

Abstract (from CDS):

We report on the variability of 443 flat-spectrum, compact radio sources monitored using the VLA for 3 days in four epochs at ∼4 month intervals at 5 GHz as part of the Micro-Arcsecond Scintillation-Induced Variability (MASIV) survey. Over half of these sources exhibited 2%-10% rms variations on timescales over 2 days. We analyzed the variations by two independent methods and find that the rms variability amplitudes of the sources correlate with the emission measure in the ionized interstellar medium along their respective lines of sight. We thus link the variations with interstellar scintillation of components of these sources, with some (unknown) fraction of the total flux density contained within a compact region of angular diameter in the range 10-50 µas. We also find that the variations decrease for high mean flux density sources and, most importantly, for high-redshift sources. The decrease in variability is probably due either to an increase in the apparent diameter of the source or to a decrease in the flux density of the compact fraction beyond z∼2. Here we present a statistical analysis of these results, and a future paper will discuss the cosmological implications in detail.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - ISM: Structure - Radiation Mechanisms: Nonthermal - Radio Continuum: ISM

VizieR on-line data: <Available at CDS (J/ApJ/689/108): table2.dat>

Nomenclature: Table 2: MASIV JHHMM+DDMM N=443.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 156

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Number of rows : 156
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 MASIV J0009+1513 AGN 00 09 43.47 +15 13 37.9           ~ 3 0
2 6C 001403+811827 BLL 00 17 08.47489694 +81 35 08.1365094   17.60 16.52 15.95   ~ 389 1
3 ICRF J001751.7+531219 QSO 00 17 51.7596321384 +53 12 19.121143824           ~ 23 1
4 QSO J0056+1625 BLL 00 56 55.29432895 +16 25 13.3409138       19.51   ~ 41 1
5 7C 0059+5808 QSO 01 02 45.76237340 +58 24 11.1366164   20.09 19.22 18.57 17.90 ~ 231 1
6 4C 01.02 Bla 01 08 38.77110544 +01 35 00.3171844   18.54 18.39 19.05   ~ 542 1
7 [VV2006] J012201.9+031003 QSO 01 22 01.9106 +03 10 02.431     20.07 20   ~ 19 1
8 QSO B0119+247 QSO 01 22 38.81598441 +25 02 31.7927370     18.5 17.91   ~ 66 1
9 4C 25.05 Bla 01 26 42.79263357 +25 59 01.3001559     17.50 17.86   ~ 166 1
10 BWE 0133+2142 QSO 01 35 53.4945 +21 58 16.152           ~ 6 1
11 6C 013354+473615 Bla 01 36 58.59480326 +47 51 29.1000720     19.50 19.25 15.21 ~ 501 1
12 87GB 014713.9+263145 BL? 01 50 02.80498246 +26 46 28.0841460           ~ 8 0
13 [VV96] J015456.3+474327 QSO 01 54 56.28988519 +47 43 26.5396113       18.97   ~ 48 1
14 6C 021252+733537 BLL 02 17 30.81335327 +73 49 32.6217355     19.00 18.97   ~ 455 1
15 ICRF J023750.6+204618 QSO 02 37 50.62892607 +20 46 18.4555879           ~ 11 1
16 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1544 2
17 QSO B0239+108 QSO 02 42 29.17085078 +11 01 00.7279391   20.0   19.66   ~ 124 1
18 QSO J0253+3217 Bz? 02 53 33.65014202 +32 17 20.8918653           ~ 58 1
19 QSO J0259+1925 QSO 02 59 29.65594445 +19 25 44.3272958       19   ~ 32 1
20 MASIV J0308+1208 AGN 03 08 39.38 +12 08 49.7           ~ 3 0
21 ICRF J031313.4+022835 QSO 03 13 13.40546775 +02 28 35.3066546           ~ 25 0
22 QSO B0319+12 QSO 03 21 53.10350560 +12 21 13.9537765   19 19     ~ 133 1
23 ICRF J032314.7+044612 QSO 03 23 14.7229685544 +04 46 12.571169520           ~ 22 1
24 NVSS J032844+255208 Rad 03 28 44.34869922 +25 52 08.3982856           ~ 11 1
25 3FHL J0342.2+3858 BLL 03 42 16.26 +38 59 06.2       19.5   ~ 34 0
26 6C 034014+361233 QSO 03 43 28.95241581 +36 22 12.4297151     20.80 19.78   ~ 77 1
27 MASIV J0358+3850 AGN 03 58 44.43 +38 50 21.6           ~ 3 0
28 QSO B0400+258 QSO 04 03 05.58608082 +26 00 01.5027775     18 19.00   ~ 206 1
29 [VV98] J040626.0+251130 QSO 04 06 25.9973252448 +25 11 31.191296748     19.90     ~ 8 0
30 QSO B0405-385 QSO 04 06 59.03533781 -38 26 28.0423651   19.55 18.0     ~ 233 2
31 QSO B0406+121 BLL 04 09 22.00871072 +12 17 39.8476330   20.5   18.27   ~ 105 1
32 QSO B0420+022 BLL 04 22 52.21465085 +02 19 26.9307480     19.5 19.41   ~ 99 1
33 QSO B0446+113 BLL 04 49 07.67110194 +11 21 28.5963618     20.00 18.58   ~ 265 1
34 QSO J0453+0128 QSO 04 53 02.23862333 +01 28 35.6286903           ~ 19 0
35 QSO J0459+0229 QSO 04 59 52.05066296 +02 29 31.1765162   18.2 19     ~ 163 1
36 QSO B0459+135 BLL 05 02 33.21951873 +13 38 10.9588181   20.0 20.5 19.22   ~ 58 0
37 QSO J0509+0541 BLL 05 09 25.9644373872 +05 41 35.333820420 15.32 14.95 14.78 15.12   ~ 453 2
38 QSO B0507+179 QSO 05 10 02.36912937 +18 00 41.5815635   20.0 19.0 19.09   ~ 433 1
39 QSO J0530+13 Bla 05 30 56.41674741 +13 31 55.1494688     20.00 19.35   ~ 959 1
40 BWE 0531+1045 AGN 05 34 40.7276789568 +10 47 16.521928044           ~ 6 1
41 ICRF J053942.3+143345 QSO 05 39 42.36599322 +14 33 45.5616887           ~ 86 1
42 7C 0602+4030 QSO 06 05 50.85536720 +40 30 08.1034903           ~ 24 1
43 8C 0609+607 QSO 06 14 23.86617701 +60 46 21.7559176   20 19.1 18.8   ~ 71 1
44 7C 062051.50+385829.00 QSO 06 24 19.02128805 +38 56 48.7360344   20.0 20.0 19.24   ~ 78 1
45 ICRF J064359.8+123818 QSO 06 43 59.85551774 +12 38 18.1064313           ~ 11 1
46 7C 064253.00+445430.00 QSO 06 46 32.02599653 +44 51 16.5901185   19.57 18.49 18.64   ~ 348 1
47 ICRF J065917.9+081330 QSO 06 59 17.99603181 +08 13 30.9534246           ~ 33 1
48 87GB 072222.1+613123 AGN 07 26 51.6789 +61 25 13.683           ~ 6 1
49 7C 073246.29+753437.00 QSO 07 39 13.19478577 +75 27 47.7091154           ~ 16 1
50 QSO B0736+01 QSO 07 39 18.03389906 +01 37 04.6177501   16.90 16.47 16.19   ~ 687 1
51 2MASS J07412972+2557318 QSO 07 41 29.7417750048 +25 57 32.258962692       19.1   ~ 20 0
52 QSO B0742+103 QSO 07 45 33.05952486 +10 11 12.6922178     24.00 23.72   ~ 192 1
53 QSO B0748+126 QSO 07 50 52.04573865 +12 31 04.8282079   17.67 17.28 17.16   ~ 334 1
54 QSO B0754+10 BLL 07 57 06.64295154 +09 56 34.8522544   15.43 15.00 15.99   ~ 439 1
55 PMN J0758+0827 Rad 07 58 28.04394295 +08 27 09.0318107           ~ 6 1
56 SDSS J080034.34+485424.2 QSO 08 00 34.3735 +48 54 24.011           ~ 18 1
57 ICRF J080407.5+101213 QSO 08 04 07.5808533192 +10 12 13.239593424   19.05 18.71     ~ 18 1
58 6C 080047+615309 Bla 08 05 18.17956222 +61 44 23.7005580       19.64   ~ 134 1
59 ICRF J081026.4+101040 BLL 08 10 26.4238989360 +10 10 40.998553320   18.10 17.87     ~ 34 0
60 QSO B0808+019 BLL 08 11 26.70731711 +01 46 52.2201568   17.58 17.2 17.96   ~ 241 1
61 7C 081451.89+423206.00 BLL 08 18 15.99961476 +42 22 45.4148987   18.88 18.18 17.81   ~ 400 1
62 QSO J0821+3107 BLL 08 21 07.6135883448 +31 07 51.147374376   17.59 17.28     ~ 68 1
63 QSO B0823+033 BLL 08 25 50.33835759 +03 09 24.5199749   17.81 17.23 16.91   ~ 328 1
64 7C 082616.10+402902.00 BL? 08 29 35.5795 +40 18 59.282           ~ 16 1
65 QSO J0850+5159 QSO 08 50 42.2440214784 +51 59 11.650187472   19.92 19.41     ~ 47 1
66 6C 084720+804537 QSO 08 54 48.5990118096 +80 34 22.383839496           ~ 20 1
67 ICRF J085654.8+714623 QSO 08 56 54.86854258 +71 46 23.9031213           ~ 50 1
68 ICRF J091437.9+024559 Sy1 09 14 37.91343881 +02 45 59.2464510   19.94 19.74 19.2   ~ 103 1
69 ICRF J091641.7+024252 Sy1 09 16 41.76666992 +02 42 52.9013196   19.43 19.15     ~ 34 1
70 6C 091740+445437 Bla 09 20 58.45848666 +44 41 53.9850947   18.40 18.16 16.55   ~ 378 1
71 6C 092554+502611 BLL 09 29 15.4401569832 +50 13 35.990913000   17.18 16.80 15.94   ~ 143 2
72 NVSS J094616+502009 Rad 09 46 16.0426 +50 20 09.334           ~ 15 1
73 ICRF J095359.2+172056 Bla 09 53 59.2310353056 +17 20 56.658544764   18.77 18.62 18.5   ~ 45 0
74 US 1139 QSO 09 58 19.67164698 +47 25 07.8424065   18.78 18.62 18.39   ~ 240 1
75 6C 095456+654857 BLL 09 58 47.2451872176 +65 33 54.819354600     17.0 15.75   ~ 711 1
76 QSO J1007+1356 QSO 10 07 41.49808928 +13 56 29.6007670     19.0 18.59   ~ 123 1
77 QSO J1008+0621 BLL 10 08 00.81616040 +06 21 21.2160257 17.61 17.17 17.85 16.73   ~ 109 1
78 7C 101358.5+205256 QSO 10 16 44.32210575 +20 37 47.3053485   19.67 19.41 18.67   ~ 82 1
79 ICRF J102453.6+233233 Sy2 10 24 53.6370693744 +23 32 33.963550476   18.00 17.42 16.6   ~ 64 0
80 ICRF J104946.3+142938 BLL 10 49 46.32757946 +14 29 38.5737464           ~ 20 1
81 6C 105327+702759 QSO 10 56 53.61750640 +70 11 45.9155652   18.5 18.5 19.32   ~ 111 1
82 CTD 74 Bla 11 25 53.71191677 +26 10 19.9787016   18.62 18.51 18.39   ~ 146 1
83 Ton 599 Sy1 11 59 31.83391383 +29 14 43.8268224   14.80 14.41 17.652 13.39 ~ 924 1
84 ICRF J124707.5+704645 QSO 12 47 07.55260236 +70 46 45.1213497           ~ 18 1
85 QSO J1300-3253 QSO 13 00 42.4259780568 -32 53 12.114395844     18.70 18   ~ 84 1
86 87GB 131449.5+694301 AGN 13 16 22.9811 +69 27 16.661           ~ 6 1
87 ICRF J132840.5+622137 Sy1 13 28 40.56423209 +62 21 37.0359699   19.53 19.13     ~ 38 2
88 SDSS J133029.38+495427.4 QSO 13 30 29.3888787432 +49 54 27.486301752   19.38 19.14     ~ 29 1
89 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4339 2
90 8C 1353+670 QSO 13 54 23.0897270280 +66 45 25.621917120           ~ 10 1
91 [VV2006] J141031.0+614137 QSO 14 10 30.9913639152 +61 41 36.920763492   19.17 18.98     ~ 39 1
92 PB 1950 Sy1 14 17 40.4459790288 +38 18 21.141908100   18.73 18.64 18.1   ~ 56 1
93 8C 1435+638 QSO 14 36 45.8021325144 +63 36 37.866905244   17.06 16.86 16.23   ~ 212 1
94 6C 143538+512545 QSO 14 37 19.8000 +51 12 49.386           ~ 26 1
95 ICRF J144212.2+062526 QSO 14 42 12.23775093 +06 25 26.1339706           ~ 10 1
96 ICRF J144431.7+025753 BLL 14 44 31.7670776856 +02 57 53.519434128           ~ 8 0
97 [VV98] J153514.8+483700 QSO 15 35 14.6533824696 +48 36 59.692793220   18.36 18.16     ~ 56 1
98 QSO B1547+507 QSO 15 49 17.46855793 +50 38 05.7880702   18.89 18.74 18.16   ~ 131 1
99 2MASS J15594972+0805177 QSO 15 59 49.7213508504 +08 05 17.575602720           ~ 19 1
100 ICRF J161050.6+780900 QSO 16 10 50.60469327 +78 09 00.5419013           ~ 15 1
101 QSO B1614+051 QSO 16 16 37.55681923 +04 59 32.7365717   19.60 19.17 19.49   ~ 186 2
102 QSO J1619+2247 QSO 16 19 14.82460190 +22 47 47.8509104       20.00   ~ 66 1
103 4C 41.32 QSO 16 25 57.66971273 +41 34 40.6292008     22 21.73   ~ 165 1
104 [VV2006] J163915.8+412833 QSO 16 39 15.8122 +41 28 33.702   19.36 19.16 19.04 18.90 ~ 38 1
105 ICRF J164817.0+214105 BLL 16 48 17.0674 +21 41 05.874           ~ 10 0
106 [VV2006] J165913.9+171415 QSO 16 59 13.8590391576 +17 14 15.069995484   19.58 19.30     ~ 30 1
107 ICRF J170121.3+033851 QSO 17 01 21.37818791 +03 38 51.1754029           ~ 14 1
108 7C 1716+6839 QSO 17 16 13.93798667 +68 36 38.7451988   18.99 18.16 17.67   ~ 122 1
109 QSO B1717+178 BLL 17 19 13.04848035 +17 45 06.4371847   20.10 19.1 17.28   ~ 224 1
110 ICRF J171952.2+081703 QSO 17 19 52.2063161088 +08 17 03.554283336       15.87   ~ 36 1
111 ICRF J172824.9+042704 Sy1 17 28 24.95272284 +04 27 04.9138307   17.43 16.99 16.24   ~ 224 1
112 MITG J1733+1635 QSO 17 33 01.5442847832 +16 35 52.634715396   19.5 20.0     ~ 5 0
113 7C 173240.70+385949.00 BLL 17 34 20.57853650 +38 57 51.4430945   19.5 19 19.00   ~ 204 1
114 7C 173836.20+473929.00 BLL 17 39 57.12907095 +47 37 58.3614787   18.5 19.5 18.88   ~ 131 1
115 4C 51.37 Bla 17 40 36.97784792 +52 11 43.4073694   18.16 18.70 16.73   ~ 413 1
116 ICRF J174232.0+594506 BLL 17 42 31.9998615600 +59 45 06.731291412   17.74 17.14 16.7   ~ 82 1
117 2MASS J17452844+4059518 QSO 17 45 28.4547 +40 59 51.829           ~ 9 1
118 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14400 0
119 7C 174604.90+465932.00 BLL 17 47 26.64727228 +46 58 50.9262456     21.30 19.17   ~ 59 1
120 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 943 1
121 ICRF J175758.8+053148 BLL 17 57 58.82513908 +05 31 48.0245781           ~ 17 1
122 7C 175844.60+384828.00 QSO 18 00 24.76536016 +38 48 30.6974570   17.8 17.98 17.04   ~ 151 1
123 7C 1812+5602 QSO 18 12 57.66948926 +56 03 49.2000537           ~ 25 1
124 ICRF J181926.5+384501 SyG 18 19 26.54735971 +38 45 01.7860362           ~ 118 0
125 ICRF J183243.4+135744 QSO 18 32 43.47110199 +13 57 44.4005043       18.18   ~ 35 1
126 ICRF J183905.8+410059 QSO 18 39 05.8038562392 +41 00 59.096073024           ~ 24 1
127 QSO B1848+283 QSO 18 50 27.5898721080 +28 25 13.155071160   17.1 17 17.16   ~ 82 1
128 ICRF J190536.4+194308 QSO 19 05 36.47209537 +19 43 08.0450100           ~ 18 1
129 87GB 191718.9+315406 QSO 19 19 13.2333022128 +31 59 45.069607032           ~ 9 1
130 ICRF J193116.5+474341 QSO 19 31 16.54756682 +47 43 41.2037745           ~ 13 1
131 QSO J2002+4725 QSO 20 02 10.41824494 +47 25 28.7737471           ~ 41 1
132 [VV98] J200617.7+642445 QSO 20 06 17.69453821 +64 24 45.4180077     19.00 20.13   ~ 56 1
133 BWE 2011+7156 QSO 20 11 03.8210890656 +72 05 12.173472888           ~ 8 1
134 87GB 201138.8+630959 QSO 20 12 22.0231781880 +63 19 11.986665744           ~ 8 1
135 QSO J2016+1632 BLL 20 16 13.86003062 +16 32 34.1130371       17.29   ~ 40 1
136 ICRF J211354.7+112125 QSO 21 13 54.71451754 +11 21 25.3969387   19.5 20.0     ~ 13 1
137 ICRF J211636.6+053617 QSO 21 16 36.63486842 +05 36 17.0458950           ~ 26 0
138 QSO J2123+0535 QSO 21 23 44.51739933 +05 35 22.0930238   18.3 20.40 19.86   ~ 294 1
139 SDSS J213730.01+045122.1 QSO 21 37 30.0204571872 +04 51 22.166958492           ~ 15 1
140 QSO B2201+1711 BLL 22 03 26.89368237 +17 25 48.2477620     19.50 14.76   ~ 204 1
141 ICRF J220824.1+180826 QSO 22 08 24.1903686336 +18 08 26.839271184           ~ 16 0
142 QSO B2209+236 QSO 22 12 05.96631459 +23 55 40.5438259   19 20.66 19.69   ~ 230 1
143 ICRF J221239.1+275938 BLL 22 12 39.10311392 +27 59 38.4496223           ~ 44 1
144 BWE 2218+1102 QSO 22 21 19.1605495536 +11 17 41.939302020           ~ 6 1
145 ICRF J223704.2+421648 QSO 22 37 04.20971225 +42 16 48.2628262           ~ 16 1
146 ICRF J224107.2+412011 BLL 22 41 07.2051716400 +41 20 11.617123020       18.89   ~ 48 1
147 QSO B2239+096 QSO 22 41 49.71731323 +09 53 52.4450634   19.72 19.22 18.00   ~ 60 1
148 ICRF J224215.1+295543 QSO 22 42 15.15119532 +29 55 43.1187478           ~ 11 0
149 ICRF J225312.4+323604 QSO 22 53 12.49980744 +32 36 04.3267691           ~ 22 1
150 87GB 225552.3+050024 QSO 22 58 24.6036172368 +05 16 39.176580108           ~ 13 1
151 ICRF J230309.9+143141 BLL 23 03 09.95274637 +14 31 41.3545130           ~ 17 0
152 BWE 2302+2654 QSO 23 04 29.4040328328 +27 10 31.099103148           ~ 7 1
153 6C 230937+452727 QSO 23 11 47.40897544 +45 43 56.0164210       19.19   ~ 61 1
154 8C 2316+862 QSO 23 15 49.8191012256 +86 31 43.594858452           ~ 18 1
155 ICRF J232517.8+395736 BLL 23 25 17.8701567192 +39 57 36.512873352   17.8 17.80 17.8   ~ 74 1
156 ICRF J233929.7+024405 QSO 23 39 29.71060518 +02 44 05.3575285           ~ 23 1

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