next previous
Up: A catalogue

3. The source list

The positions, peak flux densities, tex2html_wrap_inline1453, and integrated flux densities, tex2html_wrap_inline1455, of the sources were determined using the AIPS routine IMFIT. The integrated flux density of a source is given by
displaymath1451
where tex2html_wrap_inline1457 and tex2html_wrap_inline1459 are the major and minor axis of the source response as fitted by a Gaussian to the map and tex2html_wrap_inline1461 and tex2html_wrap_inline1463 are the gaussian major and minor axis of the synthesized beam. The peak flux densities are much better determined than the integrated flux densities, because of the missing short spacings on the uv plane.

Table 3 (click here) lists all sources found in the survey at 1.4 GHz that fulfill the criteria described in Sect. 2.3. A sample of 113 sources is found. The source name is given in the first column. It is derived from the standard IAU system of source nomenclature (Lortet et al. 1994), namely MDM NNN (e.g. MDM 114). The letters "NNN'' indicate the sequence number within the catalogue. The position of the source is listed in the next two columns. If a source has been detected in two different fields, we use the one with the closer field centre. The integral and peak flux densities are given in Cols. 4 and 5. Both of these values have been corrected for the primary beam attenuation. Columns 6 and 7 show the spacings used and the value of the tapering when imaging the data with MX. Column 8 gives the field in which the source is detected.

 

Source name R.A. (J2000) Dec. (J2000) tex2html_wrap_inline1467 tex2html_wrap_inline1469 uvr uvt field Identifications
[h m s] [tex2html_wrap_inline1227 ' ''] [mJy] [mJy] [tex2html_wrap_inline1341] [tex2html_wrap_inline1341]
MDM 1 05 17 15.95 -70 23 58.9 80 70 >3 15 1D7 MC4(0517-704), LMC B0517-7026
MDM 2 05 18 02.58 -67 55 42.3 52 36 >3 15 1D2 MC4(0518-679), LMC B0518-6759, DEM129
MDM 3 05 18 32.74 -69 35 22.8 326 288 >5 15 1D6 MC4(0518-696A), LMC B0519-6941
MDM 4 05 18 50.08 -69 09 33.6 22 23 >3 15 1D5 MC4(0519-691), LMC B0519-6916, DEM132b
MDM 5 05 18 55.39 -69 09 00.9 6 7 >3 15 1D5 MC4(0519-691), DEM132b
MDM 7 05 19 16.42 -70 14 16.1 19 19 >3 15 1D7
MDM 8 05 19 25.72 -67 47 02.1 15 17 >3 15 1D2
MDM 9 05 20 07.00 -68 02 24.4 64 32 >5 15 1D3 MC4(0520-680), LMC B0520-6804
MDM 10 05 20 19.27 -68 12 43.1 14 13 >5 15 1D3
MDM 11 05 20 26.09 -70 42 51.5 8 9 >3 15 1D8
MDM 12 05 21 05.24 -69 59 41.2 111 104 >5 15 1D6 MC4(0521-700), LMC B0521-7002
MDM 13 05 21 08.56 -67 43 31.0 30 28 >3 15 1D2 DEM151
MDM 14 05 21 18.09 -71 02 20.1 28 24 >3 15 1D8
MDM 15 05 21 27.58 -67 07 24.1 36 35 >3 15 1D1 LMC B0521-6710
MDM 16 05 21 45.09 -70 20 48.8 5 5 >3 15 1D7
MDM 17 05 22 17.40 -67 27 40.4 36 27 >3 15 1D1
MDM 18 05 22 29.52 -70 37 56.8 148 135 >3 15 1D8 MC4(0523-706), LMC B0523-7040
MDM 19 05 22 56.13 -69 04 08.5 16 19 >5 15 2D5 DEM177
MDM 20 05 22 58.87 -68 44 29.3 23 22 >3 15 2D4
MDM 21 05 23 40.94 -70 50 20.7 225 210 >3 15 2D8 MC4(0524-708), MC37, LMC B0524-7053
MDM 22 05 23 40.97 -70 51 22.3 245 220 >3 15 2D8 MC4(0524-708), MC37, LMC B0524-7053
MDM 23 05 25 05.71 -68 28 18.5 13 9 >3 15 2D3 LMC B0525-6831, DEM180
MDM 24 05 25 05.74 -68 37 00.9 9 9 >3 15 2D4
MDM 25 05 25 17.22 -67 22 47.4 62 58 >3 15 2D1 DEM192
MDM 26 05 25 29.95 -67 31 30.5 14 10 >3 15 2D1 LMC B0526-6731, DEM192
MDM 27 05 25 33.69 -68 41 21.2 8 10 >3 15 2D4
MDM 28 05 26 11.85 -70 22 46.8 14 14 >3 15 2D7
MDM 29 05 26 24.43 -68 15 11.2 43 26 >3 15 2D3 DEM203
MDM 30 05 26 35.48 -67 49 09.3 95 89 >3 15 2D2 LMC B0526-6751
MDM 31 05 27 45.92 -67 59 27.1 35 37 >3 15 2D2
MDM 32 05 27 49.22 -70 36 44.0 54 50 >3 15 2D8 MC4(0528-706), LMC B0528-7038 , DEM208
MDM 33 05 27 54.56 -69 11 40.7 15 13 >5 15 2D5 LMC B0528-6914, DEM210
MDM 34 05 28 00.03 -70 25 41.5 22 20 >3 15 3D7
MDM 35 05 28 47.68 -68 36 23.1 22 21 >3 15 3D4
MDM 36 05 29 47.89 -69 02 11.7 15 14 >3 15 3D5
MDM 37 05 29 50.59 -67 01 14.7 14 11 >3 15 3D1 LMC B0529-6702, DEM214
MDM 38 05 29 51.64 -67 49 34.5 188 150 >3 15 3D2 MC4(0529-678), LMC B0529-6752
MDM 39 05 29 51.83 -68 10 18.4 6 6 >3 15 3D3 LMC B0530-6814
MDM 40 05 31 22.47 -70 11 54.6 11 12 >3 15 3D7 LMC B0531-7010
MDM 41 05 31 42.57 -68 34 53.9 7 8 >3 15 3D4 LMC B0532-6833
MDM 42 05 31 43.94 -70 49 25.8 18 18 >3 15 3D8 DEM221
MDM 43 05 31 54.71 -68 26 39.0 6 7 >3 15 3D3 LMC B0532-6833
MDM 44 05 32 07.16 -67 54 14.2 34 34 >3 15 3D2
MDM 45 05 32 09.65 -68 43 08.1 11 11 >3 15 3D4 MC55, LMC B0532-6841, DEM226
MDM 46 05 32 11.06 -68 30 24.4 9 9 >3 15 3D3 MC56, LMC B0532-6833
MDM 47 05 32 16.50 -70 23 57.3 10 10 >3 15 3D7
MDM 48 05 32 44.99 -70 01 28.5 75 71 >3 15 3D7 LMC B0533-7001
MDM 49 05 32 48.24 -68 23 59.3 9 9 >3 15 3D3
MDM 50 05 32 50.32 -68 20 12.6 11 12 >3 15 3D3
MDM 51 05 32 52.80 -69 46 22.5 33 30 >3 15 3D6 DEM246
MDM 52 05 32 53.24 -67 09 44.6 28 22 >3 15 3D1
MDM 53 05 32 54.21 -70 40 28.4 16 15 >3 15 3D8
MDM 54 05 33 15.32 -69 12 46.8 9 8 >3 15 3D5 DEM232
MDM 55 05 33 18.70 -67 40 00.2 29 31 >3 15 3D2 LMC B0532-6743, DEM231
MDM 56 05 33 42.44 -68 46 03.3 50 32 >3 15 3D4 LMC B0534-6847, DEM233
MDM 57 05 34 08.28 -70 37 17.4 9 11 >3 15 4D8
MDM 58 05 34 48.37 -67 56 00.1 46 39 >3 15 4D2 MC4(0534-679)
MDM 59 05 35 24.70 -67 35 09.6 23 11 >3 15 4D2 MC4(0535-676A), MC64, LMC B0535-6736,
DEM241
MDM 60 05 35 26.51 -67 17 04.5 67 56 >3 15 4D1 MC4(0535-673), LMC B0535-6718
MDM 61 05 35 37.48 -68 55 08.0 63 60 >6 0 4D4 LMC B0535-6857
MDM 62 05 36 05.06 -69 18 45.9 78 84 >6 0 4D5 DEM263
MDM 63 05 36 23.89 -70 25 43.0 9 11 >3 15 4D7
MDM 64 05 36 36.42 -67 07 36.1 65 62 >3 15 4D1 MC4(0536-671), DEM257
MDM 65 05 36 57.17 -69 13 29.0 174 149 >6 0 4D5 MC4(0537-692A), LMC B0538-6911,
DEM263
MDM 66 05 37 36.93 -68 00 34.3 35 33 >3 15 4D3 DEM268
MDM 67 05 37 56.50 -70 35 14.8 9 11 >3 15 4D8
MDM 68 05 38 04.78 -69 53 37.5 69 62 >6 0 4D6 LMC B0538-6956
MDM 69 05 38 09.01 -70 49 32.1 10 11 >3 15 4D8
MDM 70 05 38 16.15 -70 56 36.4 21 20 >3 15 4D8
MDM 71 05 38 21.43 -70 41 09.3 37 22 >3 15 5D8 LMC B0538-7042, DEM265
MDM 72 05 38 44.46 -69 04 39.2 75 56 >6 0 5D5 MC4(0539-691), MC74, LMC B0539-6907,
DEM263
MDM 73 05 39 29.92 -70 03 28.9 24 22 >3 15 4D7

Table 3: The source list at 1.4 GHz

 

 

Source name R.A. (J2000) Dec. (J2000) tex2html_wrap_inline1467 tex2html_wrap_inline1469 uvr uvt field Identifications
[h m s] [tex2html_wrap_inline1227 ' ''] [mJy] [mJy] [tex2html_wrap_inline1341] [tex2html_wrap_inline1341]
MDM 74 05 39 37.56 -69 45 27.1 50 41 >6 0 5D6 MC77, LMC B0540-6946, DEM271
MDM 75 05 39 45.82 -69 38 38.8 33 31 >6 0 5D6 MC4(0540-696B), MC76, DEM284
MDM 76 05 39 54.90 -70 07 45.8 12 12 >3 15 4D7
MDM 77 05 40 02.05 -69 06 19.8 24 27 >6 0 5D5 DEM263
MDM 78 05 40 04.65 -69 44 39.6 23 21 >6 0 5D6 MC4(0540-697A), MC77, LMC B0540-6946,
DEM271
MDM 79 05 40 10.39 -67 18 14.8 75 70 >3 15 5D1 LMC B0540-6719
MDM 80 05 40 11.43 -69 19 55.5 40 35 >6 0 5D5 MC4(0540-693), MC78, LMC B0540-6921,
DEM269
MDM 81 05 41 16.68 -67 59 55.5 21 16 >3 15 5D2 MC4(0541-680), LMC B0541-6801
MDM 82 05 41 27.23 -67 39 52.1 44 34 >3 15 5D2
MDM 83 05 41 31.58 -70 46 29.4 20 19 >3 15 5D8
MDM 84 05 41 33.03 -67 06 16.6 69 62 >3 15 5D1 MC4(0541-671), LMC B0541-6707
MDM 85 05 41 59.09 -68 15 43.4 30 31 >3 15 5D3
MDM 86 05 42 44.53 -67 25 54.4 16 14 >3 15 5D1 LMC B0543-6730
MDM 87 05 42 56.33 -70 17 36.4 12 11 >5 15 5D7
MDM 88 05 43 06.72 -71 04 05.7 58 43 >3 15 5D8 MC4(0543-710), LMC B0543-7105
MDM 89 05 43 14.49 -68 44 36.1 74 70 >3 15 5D4
MDM 90 05 43 15.29 -68 06 53.9 128 109 >3 15 5D3 MC4(0543-681), LMC B0543-6808
MDM 91 05 43 17.17 -67 15 09.8 7 7 >3 15 5D1
MDM 92 05 43 56.08 -68 17 32.4 13 12 >3 15 5D3
MDM 93 05 45 04.54 -69 39 29.7 18 14 >5 0 6D6 DEM310
MDM 94 05 45 27.65 -69 46 24.4 9 7 >5 0 6D6 LMC B0545-6947, DEM311
MDM 95 05 45 50.52 -68 45 57.8 62 53 >3 15 6D4 MC4(0546-687)
MDM 96 05 46 12.16 -68 00 15.9 21 21 >3 15 6D3 LMC B0546-6802
MDM 97 05 46 23.49 -66 55 48.2 16 13 >3 15 6D1
MDM 98 05 46 29.15 -70 26 40.7 83 50 >5 15 6D7 MC4(0547-704)
MDM 99 05 46 52.85 -68 32 48.7 13 12 >3 15 6D3
MDM 100 05 47 45.37 -67 45 07.1 90 83 >3 15 6D2 MC4(0547-677), LMC B0547-6746
MDM 101 05 47 50.31 -67 28 02.5 6 6 >3 15 6D1 LMC B0547-6729
MDM 102 05 47 51.41 -69 45 43.5 7 8 >5 0 6D6 LMC B0547-6942
MDM 103 05 47 57.70 -70 20 16.1 12 12 >5 15 6D7 LMC B0548-7025
MDM 104 05 48 45.46 -66 57 26.7 13 8 >3 15 6D1
MDM 105 05 48 55.14 -70 39 26.7 21 21 >3 15 6D8 LMC B0549-7037
MDM 106 05 49 39.70 -69 38 23.6 14 14 >5 0 6D6
MDM 107 05 50 15.89 -67 36 03.5 24 21 >3 15 6D2
MDM 108 05 50 32.90 -68 20 55.5 48 34 >3 15 6D3 MC4(0550-683), LMC B0550-6823
MDM 109 05 50 48.97 -70 34 34.7 47 28 >3 15 6D8
MDM 110 05 51 30.31 -69 16 32.8 91 79 >3 15 6D5 MC4(0551-692), LMC B0551-6917
MDM 111 05 51 39.49 -68 43 17.3 30 30 >3 15 6D4 MC4(0552-687), LMC B0552-6843
MDM 112 05 52 05.81 -68 14 41.9 178 153 >3 15 6D3 MC4(0552-682), LMC B0552-6815
MDM 113 05 52 27.83 -69 48 02.9 75 45 >5 0 6D6 MC4(0552-698), LMC B0552-6948
MDM 114 05 52 28.46 -70 21 37.0 56 44 >5 15 6D7 MC4(0552-703), LMC B0552-7022

Table 3: continued

The maps at 2.4 GHz show a better quality than the data at 1.4 GHz. This is due to the smaller amplitude of the extended emission at the shorter wavelength. 70 point sources have been detected at 2.4 GHz; these are listed in Table 4 (click here). Source MDM 6 has not been detected at 1.4 GHz due to the less sensitivity at this frequency. The source positions at 1.4 GHz and 2.4 GHz agree very well. The position difference is mainly below 2'' and independent of the flux density of the source. For 69 sources the spectral index tex2html_wrap_inline1175, with tex2html_wrap_inline1959, between 1.4 and 2.4 GHz has been estimated using the peak flux density tex2html_wrap_inline1453. The values are listed in Col. 9. The mean spectral index for all 69 sources is tex2html_wrap_inline1963.

 

Source name R.A. (J2000) Dec. (J2000) tex2html_wrap_inline1467 tex2html_wrap_inline1469 uvr uvt field tex2html_wrap_inline1175
[h m s] [tex2html_wrap_inline1227 ' ''] [mJy] [mJy] [tex2html_wrap_inline1341] [tex2html_wrap_inline1341]
MDM 1 05 17 16.07 -70 23 59.0 61 49 >2 30 1D7 -0.67
MDM 2 05 18 02.61 -67 55 43.3 19 16 >3 30 1D2 -1.48
MDM 3 05 18 32.72 -69 35 22.5 259 219 >3 30 1D6 -0.50
MDM 4 05 18 50.03 -69 09 32.0 6 6 >3 30 1D5 -2.55
MDM 5 05 18 55.25 -69 09 00.7 5 5 >3 30 1D5 -0.57
MDM 6 05 19 10.74 -68 15 44.4 6 6 >3 30 1D3
MDM 7 05 19 16.38 -70 14 16.5 29 20 >2 30 1D7 +0.05
MDM 8 05 19 25.77 -67 47 01.6 11 11 >3 30 1D2 -0.79
MDM 9 05 20 07.74 -68 02 25.0 24 20 >3 30 1D3 -0.87
MDM 10 05 20 19.04 -68 12 42.7 6 5 >3 30 1D3 -1.69
MDM 11 05 20 25.85 -70 42 52.5 7 8 >3 30 1D8 -0.28
MDM 12 05 21 05.24 -69 59 41.2 91 92 >3 30 1D6 -0.22
MDM 13 05 21 08.61 -67 43 31.4 18 14 >3 30 1D2 -1.27
MDM 15 05 21 27.67 -67 07 24.3 33 30 >3 30 1D1 -0.30
MDM 18 05 22 29.55 -70 37 56.6 68 68 >3 30 1D8 -1.28
MDM 21 05 23 40.86 -70 50 20.3 144 120 >3 30 2D8 -1.03
MDM 22 05 23 41.01 -70 51 23.8 156 141 >3 30 2D8 -0.82
MDM 24 05 25 05.62 -68 37 00.7 8 8 >3 30 2D4 -0.23
MDM 25 05 25 17.22 -67 22 47.5 67 61 >3 30 2D1 +0.09
MDM 27 05 25 33.87 -68 41 20.9 6 6 >3 30 2D4 -0.92
MDM 28 05 26 11.92 -70 22 47.4 6 6 >3 30 2D7 -1.57
MDM 29 05 26 24.76 -68 15 14.6 14 14 >3 30 2D3 -1.16
MDM 30 05 26 35.34 -67 49 09.4 119 111 >0 30 2D2 +0.42
MDM 31 05 27 45.90 -67 59 27.1 39 46 >0 30 2D2 +0.41
MDM 32 05 27 49.20 -70 36 44.2 35 31 >3 30 2D8 -0.91
MDM 35 05 28 47.65 -68 36 22.9 22 24 >3 30 3D4 +0.24
MDM 38 05 29 51.64 -67 49 33.6 101 55 >3 30 3D2 -1.85
MDM 40 05 31 22.53 -70 11 54.5 5 6 >3 30 3D7 -1.24
MDM 42 05 31 43.93 -70 49 25.4 16 14 >3 30 3D8 -0.39
MDM 44 05 32 07.06 -67 54 14.3 22 18 >3 30 3D2 -1.15
MDM 45 05 32 09.69 -68 43 07.9 11 12 >3 30 3D4 +0.06
MDM 48 05 32 44.99 -70 01 28.7 48 47 >3 30 3D7 -0.78
MDM 50 05 32 50.28 -68 20 12.8 4 5 >3 30 3D3 -1.54
MDM 51 05 32 52.81 -69 46 22.8 22 18 >3 30 3D6 -0.95
MDM 52 05 32 53.18 -67 09 46.1 19 18 >3 30 3D1 -0.39
MDM 53 05 32 54.25 -70 40 28.3 25 25 >3 30 3D8 +0.95
MDM 55 05 33 18.55 -67 39 59.7 23 24 >3 30 3D2 -0.51
MDM 56 05 33 42.36 -68 46 04.0 18 9 >3 30 3D4 -2.33
MDM 60 05 35 26.68 -67 17 04.7 44 37 >2 30 4D1 -0.76
MDM 61 05 35 37.56 -68 55 08.2 72 64 >3 30 4D4 +0.11
MDM 62 05 36 05.04 -69 18 46.3 49 46 >3 30 4D5 -1.11
MDM 63 05 36 23.80 -70 25 43.6 9 10 >3 30 4D7 -0.26
MDM 64 05 36 36.41 -67 07 36.0 48 40 >2 30 4D1 -0.83
MDM 65 05 36 57.23 -69 13 29.0 116 110 >3 30 4D5 -0.56
MDM 66 05 37 36.88 -68 00 33.8 14 12 >3 30 4D3 -1.85
MDM 68 05 38 04.66 -69 53 37.2 29 33 >3 30 4D6 -1.17
MDM 70 05 38 16.32 -70 56 37.3 23 23 >3 30 4D8 +0.27
MDM 74 05 39 37.59 -69 45 27.6 61 51 >3 30 5D6 +0.38
MDM 75 05 39 45.85 -69 38 39.0 61 53 >3 30 5D6 +0.99
MDM 78 05 40 04.48 -69 44 38.9 15 18 >3 30 5D6 -0.32
MDM 79 05 40 10.42 -67 18 15.2 74 63 >3 30 5D1 -0.18
MDM 80 05 40 11.55 -69 19 54.9 26 19 >3 30 5D5 -1.11
MDM 82 05 41 27.21 -67 39 51.2 18 17 >3 30 5D2 -1.29
MDM 83 05 41 31.65 -70 46 27.9 11 13 >3 30 5D8 -0.70
MDM 84 05 41 33.09 -67 06 16.7 39 36 >3 30 5D1 -1.03
MDM 85 05 41 59.05 -68 15 43.1 27 28 >2 30 5D3 -0.21
MDM 86 05 42 44.56 -67 25 54.6 12 10 >3 30 5D1 -0.57
MDM 87 05 42 56.58 -70 17 34.7 4 4 >3 30 5D7 -1.85
MDM 89 05 43 14.53 -68 44 35.9 52 45 >3 30 5D4 -0.81
MDM 90 05 43 15.21 -68 06 53.7 76 43 >2 30 5D3 -1.71
MDM 91 05 43 17.02 -67 15 09.3 3 4 >3 30 5D1 -0.97
MDM 94 05 45 27.76 -69 46 22.5 10 7 >3 30 6D6 +0.04
MDM 95 05 45 50.27 -68 45 57.0 30 28 >3 30 6D4 -1.20
MDM 98 05 46 29.34 -70 26 44.3 30 30 >3 30 6D7 -0.95
MDM 100 05 47 45.35 -67 45 07.0 69 52 >2 30 6D2 -0.85
MDM 101 05 47 50.32 -67 28 03.2 12 9 >3 30 6D1 +0.96
MDM 102 05 47 51.27 -69 45 43.3 4 5 >3 30 6D6 -1.07
MDM 103 05 47 57.45 -70 20 16.2 7 7 >3 30 6D7 -1.01
MDM 105 05 48 55.24 -70 39 28.3 12 11 >3 30 6D8 -1.15
MDM 106 05 49 39.71 -69 38 23.9 10 10 >3 30 6D6 -0.62

Table 4: The source list at 2.4 GHz

 

3.1. Missing flux density

After filtering out the extended structures, only compact objects and the cores of extended sources appear in the final images. Excluding baselines below tex2html_wrap_inline2405 the survey is only sensitive to structures smaller than about 54'' at 1.4 GHz and 34'' at 2.4 GHz. Assuming a distance of 50 kpc for the LMC (Westerlund 1992), these values correspond to sizes smaller than 13 pc (1.4 GHz) and 8 pc (2.4 GHz). To illustrate this effect for several of our snapshot fields we added artificial 100 mJy sources of different sizes to the uv-data using the task UVSUB and then processed the data with MX in the same way that we had processed the field before. After mapping and cleaning the field with MX, flux is lost for the artificial source depending on its size. Figure 2 (click here) shows the distribution of the integral flux densities for artificial sources of different angular sizes. For a diameter of about 3'', we lose 10tex2html_wrap_inline1409 of the flux. This loss of flux depends on the uv-coverage of the field. For fields where only baselines above tex2html_wrap_inline2419 have been used because of very extended emission, much more flux is lost. If a 100 mJy source with an angular size of 3'' is added into field 5D6, the missing flux is on the order of 19tex2html_wrap_inline1409. For angular sizes above 10'', the flux drops off quite sharply. This implies that the flux densities of the snapshot sources are lower limits in the case of resolved sources.

  figure383
Figure 2: Integrated flux densities for simulated 100 mJy sources of several sizes


next previous
Up: A catalogue

Copyright by the European Southern Observatory (ESO)
web@ed-phys.fr