We have conducted a search of the VLSS fields (all-sky at Dec>30deg, 74 MHz) looking for the EMS sources, and cross correlating with the NVSS in order to get spectral index measurement. Below, we report all the VLSS sources that are within 1.5 times r95 from the unassociated sources, sorted in order of increasing spectral index (i.e. the most inverted/flattest sources come first).
From an inspection of the very first few lines, it seems that some good associations could be found. They may have been missed by CRATES/CGRaBS/BZCat because they are behind the galactic plane, or they lack optical counterpart.
Some of these sources are also known as VLBI calibrators/fringe finders, which supports a blazar-like scenario (they are bright and highly compact sources). Furthermore, this suggests that searching the EMS list for VLBI calibrators could help to find more associations, so we started a parallel project using VLBI calibrators/fringe finders.
On the other hand, the bottom lines in this table could be used for a search of steep spectrum sources.
EMS name |
EMS RA |
EMS Dec |
alpha |
d |
EMS r95 |
d/r95 |
Possible association |
|---|---|---|---|---|---|---|---|
|
(dd) |
(dd) |
74 MHz-1400 MHz |
(dd) |
(dd) |
|
(with NED link) |
EMS0276 |
65.957 |
41.827 |
-0.26 |
0.021 |
0.048 |
0.43 |
|
EMS0873 |
200.795 |
29.708 |
-0.20 |
0.035 |
0.124 |
0.28 |
|
EMS0578 |
130.217 |
13.197 |
-0.15 |
0.021 |
0.160 |
0.13 |
|
EMS0405 |
90.135 |
38.647 |
-0.10 |
0.099 |
0.294 |
0.34 |
|
EMS0075 |
17.518 |
68.071 |
0.00 |
0.027 |
0.089 |
0.31 |
|
EMS0522 |
116.856 |
-33.060 |
0.08 |
0.121 |
0.104 |
1.17 |
|
EMS0164 |
41.294 |
24.202 |
0.16 |
0.111 |
0.133 |
0.84 |
|
EMS0134 |
33.640 |
60.330 |
0.17 |
0.131 |
0.217 |
0.60 |
|
EMS0150 |
36.560 |
39.393 |
0.17 |
0.217 |
0.541 |
0.40 |
|
EMS0430 |
95.590 |
37.918 |
0.17 |
0.037 |
0.155 |
0.24 |
|
EMS1583 |
359.651 |
-18.159 |
0.18 |
0.155 |
0.139 |
1.12 |
|
EMS0597 |
134.430 |
-25.978 |
0.18 |
0.237 |
0.329 |
0.72 |
|
EMS0623 |
141.073 |
28.201 |
0.20 |
0.111 |
0.144 |
0.77 |
|
EMS0659 |
152.638 |
-1.897 |
0.22 |
0.163 |
0.204 |
0.80 |
|
EMS1367 |
305.317 |
73.326 |
0.23 |
0.235 |
0.318 |
0.74 |
|
EMS1367 |
305.317 |
73.326 |
0.24 |
0.247 |
0.318 |
0.78 |
|
EMS0527 |
118.624 |
-11.806 |
0.25 |
0.023 |
0.079 |
0.29 |
|
EMS0945 |
218.716 |
20.386 |
0.26 |
0.121 |
0.296 |
0.41 |
|
EMS0329 |
75.716 |
18.856 |
0.26 |
0.310 |
0.622 |
0.50 |
|
EMS0642 |
147.462 |
17.963 |
0.26 |
0.094 |
0.135 |
0.69 |
|
EMS0134 |
33.640 |
60.330 |
0.29 |
0.123 |
0.217 |
0.57 |
|
EMS0729 |
169.975 |
-22.085 |
0.32 |
0.108 |
0.091 |
1.18 |
|
EMS0176 |
44.064 |
3.395 |
0.33 |
0.171 |
0.155 |
1.10 |
|
EMS1539 |
347.754 |
2.069 |
0.34 |
0.063 |
0.084 |
0.75 |
|
EMS0149 |
36.590 |
9.617 |
0.35 |
0.261 |
0.174 |
1.50 |
|
EMS0615 |
138.187 |
27.958 |
0.35 |
0.093 |
0.179 |
0.52 |
|
EMS0742 |
172.350 |
37.952 |
0.36 |
0.183 |
0.150 |
1.22 |
|
EMS1017 |
237.141 |
14.870 |
0.39 |
0.108 |
0.136 |
0.80 |
|
EMS1415 |
314.445 |
30.971 |
0.40 |
0.185 |
0.215 |
0.86 |
|
EMS0793 |
185.492 |
71.031 |
0.40 |
0.166 |
0.225 |
0.74 |
|
EMS0565 |
127.248 |
8.959 |
0.41 |
0.127 |
0.127 |
1.01 |
|
EMS0535 |
120.745 |
-3.700 |
0.41 |
0.114 |
0.126 |
0.91 |
|
EMS0730 |
170.095 |
7.170 |
0.44 |
0.111 |
0.096 |
1.16 |
|
EMS0589 |
132.352 |
4.899 |
0.45 |
0.039 |
0.149 |
0.26 |
|
EMS0014 |
2.241 |
6.572 |
0.46 |
0.102 |
0.120 |
0.85 |
|
EMS1533 |
345.104 |
31.632 |
0.46 |
0.212 |
0.143 |
1.49 |
|
EMS0353 |
80.450 |
21.237 |
0.46 |
0.024 |
0.056 |
0.42 |
|
EMS1443 |
322.026 |
36.372 |
0.47 |
0.173 |
0.194 |
0.89 |
|
EMS1490 |
332.179 |
39.095 |
0.47 |
0.229 |
0.157 |
1.46 |
|
EMS1402 |
311.929 |
10.917 |
0.48 |
0.077 |
0.255 |
0.30 |
|
EMS0068 |
15.709 |
58.455 |
0.48 |
0.053 |
0.084 |
0.63 |
|
EMS0640 |
146.685 |
10.177 |
0.49 |
0.115 |
0.227 |
0.51 |
|
EMS0587 |
132.286 |
66.209 |
0.51 |
0.084 |
0.170 |
0.49 |
|
EMS1518 |
340.936 |
41.022 |
0.53 |
0.111 |
0.142 |
0.78 |
|
EMS0763 |
178.246 |
60.574 |
0.55 |
0.270 |
0.342 |
0.79 |
|
EMS0023 |
5.595 |
-18.835 |
0.56 |
0.193 |
0.140 |
1.38 |
|
EMS1577 |
359.355 |
4.788 |
0.58 |
0.095 |
0.167 |
0.57 |
|
EMS0697 |
162.114 |
23.627 |
0.59 |
0.299 |
0.209 |
1.43 |
|
EMS1136 |
261.391 |
-4.929 |
0.60 |
0.245 |
0.228 |
1.07 |
|
EMS0990 |
230.120 |
42.307 |
0.60 |
0.126 |
0.315 |
0.40 |
|
EMS1383 |
309.280 |
57.300 |
0.61 |
0.247 |
0.413 |
0.60 |
|
EMS0426 |
94.446 |
-17.313 |
0.61 |
0.078 |
0.110 |
0.71 |
|
EMS0659 |
152.638 |
-1.897 |
0.62 |
0.133 |
0.204 |
0.65 |
|
EMS0260 |
62.485 |
-3.950 |
0.62 |
0.081 |
0.089 |
0.91 |
|
EMS1443 |
322.026 |
36.372 |
0.62 |
0.163 |
0.194 |
0.84 |
|
EMS1536 |
345.428 |
24.370 |
0.63 |
1.204 |
0.994 |
1.21 |
|
EMS1402 |
311.929 |
10.917 |
0.64 |
0.096 |
0.255 |
0.38 |
|
EMS0022 |
5.421 |
-25.922 |
0.64 |
0.046 |
0.116 |
0.40 |
|
EMS0697 |
162.114 |
23.627 |
0.66 |
0.090 |
0.209 |
0.43 |
|
EMS1153 |
264.012 |
-11.303 |
0.66 |
0.250 |
0.291 |
0.86 |
|
EMS1399 |
311.678 |
30.701 |
0.67 |
0.214 |
0.171 |
1.25 |
|
EMS0219 |
53.542 |
75.057 |
0.68 |
0.175 |
0.169 |
1.03 |
|
EMS1556 |
352.228 |
37.953 |
0.69 |
0.145 |
0.100 |
1.45 |
|
EMS1454 |
323.496 |
-21.505 |
0.70 |
0.165 |
0.165 |
1.00 |
|
EMS0468 |
105.600 |
-19.889 |
0.74 |
0.141 |
0.183 |
0.77 |
|
EMS0606 |
137.228 |
-21.358 |
0.75 |
0.170 |
0.143 |
1.19 |
|
EMS0426 |
94.446 |
-17.313 |
0.75 |
0.101 |
0.110 |
0.92 |
|
EMS0218 |
53.404 |
29.289 |
0.76 |
0.187 |
0.147 |
1.27 |
|
EMS0435 |
96.517 |
0.020 |
0.76 |
0.041 |
0.161 |
0.26 |
|
EMS1414 |
314.174 |
49.688 |
0.76 |
0.065 |
0.083 |
0.79 |
|
EMS0967 |
225.813 |
47.928 |
0.77 |
0.053 |
0.379 |
0.14 |
|
EMS0402 |
90.070 |
51.225 |
0.78 |
0.177 |
0.747 |
0.24 |
|
EMS0945 |
218.716 |
20.386 |
0.78 |
0.276 |
0.296 |
0.93 |
|
EMS0315 |
73.349 |
27.810 |
0.78 |
0.321 |
0.327 |
0.98 |
|
EMS0701 |
163.621 |
22.180 |
0.79 |
0.135 |
0.105 |
1.29 |
|
EMS1203 |
272.843 |
16.180 |
0.79 |
0.220 |
0.164 |
1.34 |
|
EMS0402 |
90.070 |
51.225 |
0.79 |
0.190 |
0.747 |
0.25 |
|
EMS1536 |
345.428 |
24.370 |
0.80 |
1.207 |
0.994 |
1.21 |
|
EMS0759 |
177.857 |
-13.789 |
0.81 |
0.160 |
0.245 |
0.65 |
|
EMS0235 |
55.549 |
38.994 |
0.81 |
0.134 |
0.136 |
0.99 |
|
EMS1402 |
311.929 |
10.917 |
0.82 |
0.176 |
0.255 |
0.69 |
|
EMS1445 |
322.457 |
-4.438 |
0.83 |
0.172 |
0.169 |
1.02 |
|
EMS1138 |
261.583 |
-7.398 |
0.83 |
0.182 |
0.194 |
0.94 |
|
EMS0882 |
202.562 |
69.970 |
0.83 |
0.133 |
0.234 |
0.57 |
|
EMS0659 |
152.638 |
-1.897 |
0.85 |
0.223 |
0.204 |
1.09 |
|
EMS0923 |
211.880 |
-29.424 |
0.85 |
0.185 |
0.419 |
0.44 |
|
EMS1583 |
359.651 |
-18.159 |
0.86 |
0.191 |
0.139 |
1.38 |
|
EMS0990 |
230.120 |
42.307 |
0.89 |
0.263 |
0.315 |
0.83 |
|
EMS0570 |
128.831 |
9.651 |
0.89 |
0.284 |
0.212 |
1.34 |
|
EMS0570 |
128.831 |
9.651 |
0.89 |
0.224 |
0.212 |
1.06 |
|
EMS0992 |
230.277 |
-3.889 |
0.91 |
0.162 |
0.110 |
1.47 |
|
EMS0714 |
166.718 |
28.148 |
0.91 |
0.230 |
0.239 |
0.96 |
|
EMS0905 |
208.035 |
-15.355 |
0.91 |
0.188 |
0.170 |
1.11 |
|
EMS1533 |
345.104 |
31.632 |
0.91 |
0.039 |
0.143 |
0.27 |
|
EMS0475 |
106.692 |
37.701 |
0.92 |
0.166 |
0.113 |
1.47 |
|
EMS0999 |
231.820 |
41.826 |
0.92 |
0.132 |
0.237 |
0.56 |
|
EMS0945 |
218.716 |
20.386 |
0.93 |
0.279 |
0.296 |
0.94 |
|
EMS1234 |
277.538 |
6.285 |
0.94 |
0.038 |
0.074 |
0.52 |
|
EMS0570 |
128.831 |
9.651 |
0.95 |
0.219 |
0.212 |
1.03 |
|
EMS0584 |
131.486 |
-7.232 |
0.95 |
0.078 |
0.159 |
0.49 |
|
EMS0186 |
47.171 |
74.726 |
0.95 |
0.136 |
0.115 |
1.18 |
|
EMS0428 |
95.268 |
-25.950 |
0.96 |
0.235 |
0.175 |
1.34 |
|
EMS0404 |
90.108 |
-20.026 |
0.96 |
0.169 |
0.439 |
0.39 |
|
EMS0597 |
134.430 |
-25.978 |
0.96 |
0.218 |
0.329 |
0.66 |
|
EMS0742 |
172.350 |
37.952 |
0.96 |
0.179 |
0.150 |
1.20 |
|
EMS1242 |
278.812 |
13.764 |
0.97 |
0.096 |
0.108 |
0.90 |
|
EMS1443 |
322.026 |
36.372 |
0.98 |
0.220 |
0.194 |
1.14 |
|
EMS0570 |
128.831 |
9.651 |
0.99 |
0.207 |
0.212 |
0.98 |
|
EMS1414 |
314.174 |
49.688 |
1.00 |
0.079 |
0.083 |
0.95 |
|
EMS0952 |
220.505 |
43.864 |
1.00 |
0.133 |
0.158 |
0.84 |
|
EMS0164 |
41.294 |
24.202 |
1.00 |
0.120 |
0.133 |
0.90 |
|
EMS0103 |
24.445 |
58.235 |
1.01 |
0.258 |
0.179 |
1.44 |
|
EMS1325 |
297.679 |
12.466 |
1.01 |
0.247 |
0.217 |
1.14 |
|
EMS0570 |
128.831 |
9.651 |
1.01 |
0.180 |
0.212 |
0.85 |
|
EMS0588 |
132.350 |
-29.184 |
1.02 |
0.138 |
0.185 |
0.74 |
|
EMS0570 |
128.831 |
9.651 |
1.02 |
0.207 |
0.212 |
0.98 |
|
EMS1258 |
282.443 |
-1.384 |
1.03 |
0.174 |
0.335 |
0.52 |
|
EMS0945 |
218.716 |
20.386 |
1.03 |
0.215 |
0.296 |
0.73 |
|
EMS0402 |
90.070 |
51.225 |
1.03 |
0.068 |
0.747 |
0.09 |
|
EMS0473 |
106.371 |
-10.604 |
1.04 |
0.146 |
0.297 |
0.49 |
|
EMS0570 |
128.831 |
9.651 |
1.04 |
0.180 |
0.212 |
0.85 |
|
EMS0426 |
94.446 |
-17.313 |
1.04 |
0.101 |
0.110 |
0.92 |
|
EMS1136 |
261.391 |
-4.929 |
1.05 |
0.142 |
0.228 |
0.62 |
|
EMS1153 |
264.012 |
-11.303 |
1.06 |
0.228 |
0.291 |
0.79 |
|
EMS0219 |
53.542 |
75.057 |
1.06 |
0.158 |
0.169 |
0.93 |
|
EMS0793 |
185.492 |
71.031 |
1.06 |
0.111 |
0.225 |
0.49 |
|
EMS1376 |
307.533 |
-6.278 |
1.06 |
0.226 |
0.198 |
1.14 |
|
EMS0007 |
1.101 |
22.115 |
1.07 |
0.286 |
0.195 |
1.47 |
|
EMS0711 |
166.082 |
7.613 |
1.07 |
0.181 |
0.126 |
1.44 |
|
EMS1402 |
311.929 |
10.917 |
1.11 |
0.161 |
0.255 |
0.63 |
|
EMS0793 |
185.492 |
71.031 |
1.11 |
0.202 |
0.225 |
0.90 |
|
EMS0429 |
95.327 |
25.171 |
1.11 |
0.084 |
0.126 |
0.67 |
|
EMS0281 |
67.014 |
55.934 |
1.12 |
0.133 |
0.176 |
0.76 |
|
EMS0532 |
120.137 |
44.090 |
1.12 |
0.270 |
0.375 |
0.72 |
|
EMS0468 |
105.600 |
-19.889 |
1.13 |
0.249 |
0.183 |
1.36 |
|
EMS0714 |
166.718 |
28.148 |
1.13 |
0.095 |
0.239 |
0.40 |
|
EMS0905 |
208.035 |
-15.355 |
1.13 |
0.245 |
0.170 |
1.44 |
|
EMS0759 |
177.857 |
-13.789 |
1.14 |
0.126 |
0.245 |
0.52 |
|
EMS0348 |
78.945 |
74.008 |
1.14 |
0.291 |
0.213 |
1.36 |
|
EMS0967 |
225.813 |
47.928 |
1.15 |
0.314 |
0.379 |
0.83 |
|
EMS0786 |
182.999 |
-9.599 |
1.16 |
0.129 |
0.187 |
0.69 |
|
EMS0759 |
177.857 |
-13.789 |
1.16 |
0.140 |
0.245 |
0.57 |
|
EMS0588 |
132.350 |
-29.184 |
1.17 |
0.202 |
0.185 |
1.09 |
|
EMS0428 |
95.268 |
-25.950 |
1.18 |
0.254 |
0.175 |
1.45 |
|
EMS0772 |
179.764 |
6.823 |
1.19 |
0.116 |
0.530 |
0.22 |
|
EMS0182 |
46.267 |
-15.996 |
1.20 |
0.148 |
0.106 |
1.39 |
|
EMS0933 |
215.762 |
37.725 |
1.21 |
0.040 |
0.228 |
0.18 |
|
EMS1583 |
359.651 |
-18.159 |
1.23 |
0.192 |
0.139 |
1.39 |
|
EMS0404 |
90.108 |
-20.026 |
1.23 |
0.224 |
0.439 |
0.51 |
|
EMS0022 |
5.421 |
-25.922 |
1.24 |
0.089 |
0.116 |
0.77 |
|
EMS1536 |
345.428 |
24.370 |
1.25 |
0.333 |
0.994 |
0.34 |
|
EMS1442 |
321.934 |
59.056 |
1.25 |
0.257 |
0.658 |
0.39 |
|
EMS0294 |
68.580 |
-20.325 |
1.27 |
0.184 |
0.173 |
1.07 |
|
EMS1212 |
274.214 |
25.311 |
1.28 |
0.281 |
0.520 |
0.54 |
|
EMS1443 |
322.026 |
36.372 |
1.30 |
0.275 |
0.194 |
1.42 |
|
EMS1528 |
344.250 |
-10.410 |
1.30 |
0.057 |
0.119 |
0.48 |
|
EMS0990 |
230.120 |
42.307 |
1.32 |
0.238 |
0.315 |
0.76 |
|
EMS0763 |
178.246 |
60.574 |
1.32 |
0.242 |
0.342 |
0.71 |
|
EMS0149 |
36.590 |
9.617 |
1.34 |
0.062 |
0.174 |
0.36 |
|
EMS1533 |
345.104 |
31.632 |
1.35 |
0.212 |
0.143 |
1.48 |
|
EMS0429 |
95.327 |
25.171 |
1.39 |
0.145 |
0.126 |
1.15 |
|
EMS0773 |
180.004 |
1.969 |
1.41 |
0.182 |
0.215 |
0.85 |
|
EMS1583 |
359.651 |
-18.159 |
1.43 |
0.141 |
0.139 |
1.01 |
|
EMS0730 |
170.095 |
7.170 |
1.43 |
0.135 |
0.096 |
1.40 |
|
EMS1493 |
333.177 |
7.052 |
1.44 |
0.196 |
0.273 |
0.72 |
|
EMS1415 |
314.445 |
30.971 |
1.45 |
0.150 |
0.215 |
0.70 |
|
EMS0022 |
5.421 |
-25.922 |
1.46 |
0.086 |
0.116 |
0.75 |
|
EMS1577 |
359.355 |
4.788 |
1.48 |
0.130 |
0.167 |
0.78 |
|
EMS1304 |
292.172 |
-5.138 |
1.51 |
0.212 |
0.188 |
1.13 |
|
EMS0793 |
185.492 |
71.031 |
1.55 |
0.157 |
0.225 |
0.70 |
|
EMS0967 |
225.813 |
47.928 |
1.60 |
0.202 |
0.379 |
0.53 |
|
EMS1399 |
311.678 |
30.701 |
1.65 |
0.236 |
0.171 |
1.38 |
|
EMS0260 |
62.485 |
-3.950 |
1.66 |
0.065 |
0.089 |
0.73 |
|
EMS0348 |
78.945 |
74.008 |
1.70 |
0.274 |
0.213 |
1.28 |
|
EMS0023 |
5.595 |
-18.835 |
1.74 |
0.166 |
0.140 |
1.19 |
|
EMS0276 |
65.957 |
41.827 |
1.85 |
0.038 |
0.048 |
0.79 |
|
EMS0150 |
36.560 |
39.393 |
1.85 |
0.230 |
0.541 |
0.42 |
|
EMS0701 |
163.621 |
22.180 |
1.86 |
0.123 |
0.105 |
1.17 |
|
EMS0697 |
162.114 |
23.627 |
1.88 |
0.070 |
0.209 |
0.34 |
|
EMS0405 |
90.135 |
38.647 |
1.92 |
0.265 |
0.294 |
0.90 |
|
EMS0967 |
225.813 |
47.928 |
1.93 |
0.039 |
0.379 |
0.10 |
|
EMS0570 |
128.831 |
9.651 |
1.94 |
0.277 |
0.212 |
1.31 |
|
EMS0588 |
132.350 |
-29.184 |
1.95 |
0.209 |
0.185 |
1.13 |
|
EMS0763 |
178.246 |
60.574 |
1.97 |
0.225 |
0.342 |
0.66 |
|
EMS0149 |
36.590 |
9.617 |
2.02 |
0.245 |
0.174 |
1.41 |
|
EMS0659 |
152.638 |
-1.897 |
2.03 |
0.134 |
0.204 |
0.66 |
|
EMS1445 |
322.457 |
-4.438 |
2.06 |
0.184 |
0.169 |
1.09 |
|
EMS0967 |
225.813 |
47.928 |
2.12 |
0.306 |
0.379 |
0.81 |
|
EMS0315 |
73.349 |
27.810 |
2.13 |
0.347 |
0.327 |
1.06 |
|
EMS1153 |
264.012 |
-11.303 |
2.25 |
0.244 |
0.291 |
0.84 |
|
EMS0219 |
53.542 |
75.057 |
2.38 |
0.143 |
0.169 |
0.85 |
|
EMS1242 |
278.812 |
13.764 |
2.43 |
0.101 |
0.108 |
0.94 |
|
EMS0772 |
179.764 |
6.823 |
2.46 |
0.144 |
0.530 |
0.27 |
|
EMS0714 |
166.718 |
28.148 |
2.48 |
0.231 |
0.239 |
0.96 |