VIII/62ivo://CDS.VizieR/VIII/62CDSde Bruyn G.Miley G.Rengelink R.Tang Y.Bremer M.Rottgering H.,Raimond R.Bremer M.Fullagar D.2017-08-01T06:11:21Z2017-08-01T06:53:43ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frradio-sourcessurveysThe Westerbork Northern Sky Survey (WENSS) is a low-frequency radio survey that covers the whole sky north of 30{deg} at a wavelength of 92cm (330MHz) to a limiting flux density of approximately 18 mJy (5{sigma}). This survey has a resolution of 54"x54" cosec(delta) and a positional accuracy for strong sources of 1.5". The WENSS project is a collaboration between the Netherlands Foundation for Research in Astronomy (NFRA/ASTRON) and the Leiden Observatory. Introduction to the WENSS: The Westerbork Northern Sky Survey (WENSS) is a radio survey made with the WSRT at wavelengths 92 and 49 cm. At 92 cm the entire sky above declination 30{deg} is covered. The other wavelength regime does not cover the whole sky, but only 30-50 percent, due to the amount of telescope time that is needed to do this. Using a synthesis array like the WSRT means that we get a better resolution than single dish observations, but also has the disadvantage of a smaller field of view, unless we find a way of dealing with wide field imaging. The solution for this problem is mosaicing. Instead of making one observation of a large field we make a lot of snapshots of different fields and bind them together with the help of special build software. A typical mosaic contains 80 pointing centres. Each pointing centre is sampled during 20 seconds and then the telescope moves to another centre. This takes about 10 seconds. After 40 minutes all fields are scanned and the procedure starts again. This means that in a 12 hour observation each field is scanned 18 times. To move grating rings of the map 6 different baseline settings are used, so 1 mosaic data block involves 72 hours of observational data. Each pointing centre is located at half half-power maximum beamwidth in order to get a smooth sampling grid of the data. The noise background is uniform up to 5 percent. At 92 cm (declination 30{deg}) a mosaic block is about 10 by 14{deg} large. The final product that the WENSS survey produces contain 6x6{deg} frames taken from the mosaic blocks. They are centered on the new POSS plate positions (5{deg} grid). The limiting flux density will be about 15 mJy (5 sigma) at both wavelengths. As a result the final catalogue will consist of 300,000 sources at 92 cm and 60,000 at 49 cm. The positional accuracy will be superior to all other all sky surveys (5" for the faint sources to better than 1" for the stronger sources). A large number of sources will have sufficient accurate positions to allow optical identification using a digitized version of the Palomar Sky Survey made with the APM at Cambridge. Final maps will be made at different resolutions in order to make accurate spectral index measurements. At each wavelength we will make high, medium and low resolution maps (1', 2.5' and 4' resolution at 92 cm and 0.5', 1' and 2.5' resolution at 49 cm). Maps will be made with all Stokes parameters (I, Q, U and V). This means that source information will be available both on spectral type and polarization characteristics. This is important for using the catalogue as a database for finding sources based on well known selection criteria, such as steep spectra for high redshift radio galaxies.WENSS Collaboration NFRA/ASTRON and Leiden Observatory (1998)https://cdsarc.cds.unistra.fr/viz-bin/cat/VIII/62CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.strw.leidenuniv.nl/wenss/ : the WENSS Home Pageftp://vliet.strw.leidenuniv.nl/pub/wenss/HIGHRES/ : maps in FITS formatJ/A+AS/124/259 : The Westerbork Northern Sky Survey I. (Rengelink+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=VIII/62https://vizier.iucaa.in/viz-bin/VizieR-2?-source=VIII/62http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=VIII/62https://vizier.cds.unistra.fr/viz-bin/votable?-source=VIII/62https://vizier.iucaa.in/viz-bin/votable?-source=VIII/62http://vizieridia.saao.ac.za/viz-bin/votable?-source=VIII/62GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table VIII/62/wenss (Combined table from original tables)https://vizier.cds.unistra.fr/viz-bin/conesearch/VIII/62/wenss?https://vizier.iucaa.in/viz-bin/conesearch/VIII/62/wenss?http://vizieridia.saao.ac.za/viz-bin/conesearch/VIII/62/wenss?GETtext/xml+votable180.050000true0.649458374.877250.0055555555555555561/3 7 11 15 2/5 6 7 9 10 11 21 22 23 25 26 27 37 38 39 41 42 43 53 54 55 58 59 3/15 19 35 79 83 99 143 147 163 207 211 227 228 229 231 319 383 447 511 4/55 59 71 75 135 139 311 315 327 331 391 395 567 571 583 587 647 651 823 827 839 843 903 907 920 922 923 1271 1275 1527 1531 1783 1787 2039 2043 5/213 214 215 217 218 219 229 230 231 233 234 235 277 278 279 281 282 283 293 294 295 297 298 299 533 534 535 537 539 549 550 551 553 554 555 1237 1238 1239 1241 1242 1243 1253 1254 1255 1257 1258 1259 1301 1302 1303 1305 1306 1307 1317 1318 1319 1321 1322 1323 1557 1558 1559 1561 1562 1563 1573 1574 1575 1577 1578 1579 2261 2262 2263 2265 2266 2267 2277 2278 2279 2281 2282 2283 2325 2326 2327 2329 2330 2331 2341 2342 2343 2345 2346 2347 2581 2582 2583 2585 2586 2587 2597 2598 2599 2601 2602 2603 3285 3286 3287 3289 3290 3291 3301 3302 3303 3305 3306 3307 3349 3350 3351 3353 3354 3355 3365 3366 3367 3369 3370 3371 3605 3606 3607 3609 3610 3611 3621 3622 3623 3625 3626 3627 3685 3687 5077 5078 5079 5081 5082 5083 5093 5094 5095 5097 5098 5099 6101 6102 6103 6105 6106 6107 6117 6118 6119 6121 6122 6123 7125 7126 7127 7129 7130 7131 7141 7142 7143 7145 7146 7147 8149 8150 8151 8153 8154 8155 8165 8166 8167 8169 8170 8171 6/509 511 767 830 831 846 847 849 851 867 910 911 915 931 1087 1103 1105 1107 1123 1167 1169 1171 1185 1187 2111 2127 2131 2147 2153 2154 2155 2191 2195 2211 4605 4606 4607 4861 4862 4863 4925 4926 4927 4941 4942 4943 4945 4946 4947 4961 4962 4963 5005 5006 5007 5009 5010 5011 5026 5027 5181 5182 5183 5197 5198 5199 5201 5202 5203 5217 5218 5219 5261 5262 5263 5265 5266 5267 5281 5282 5283 6205 6206 6207 6221 6222 6223 6225 6227 6241 6242 6243 6286 6287 6289 6290 6291 6307 8702 8703 8957 8958 8959 9021 9022 9023 9037 9038 9039 9041 9042 9043 9057 9058 9059 9101 9102 9103 9106 9107 9121 9122 9123 9277 9278 9279 9293 9295 9297 9298 9299 9313 9314 9315 9357 9358 9359 9361 9362 9363 9377 9378 9379 10301 10302 10303 10317 10318 10319 10321 10322 10323 10337 10338 10339 10381 10382 10383 10385 10386 10387 10401 10402 10403 12799 13055 13118 13119 13134 13135 13139 13154 13155 13197 13199 13201 13203 13219 13375 13391 13395 13411 13455 13459 13475 14399 14415 14419 14433 14435 14477 14479 14481 14482 14483 14497 14499 14745 14746 14747 19967 20223 20287 20303 20305 20307 20323 20367 20371 20387 24061 24062 24063 24319 24381 24383 24397 24398 24399 24401 24402 24403 24417 24418 24419 24462 24463 24466 24467 24481 24482 24483 28157 28158 28159 28413 28414 28415 28477 28478 28479 28493 28494 28495 28497 28498 28499 28513 28514 28515 28557 28558 28559 28561 28562 28563 28577 28578 28579 32255 32510 32511 32575 32589 32590 32591 32594 32595 32610 32611 32653 32654 32655 32657 32658 32659 32673 32674 326752.1866030450894384e-25 2.1866030450894384e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/VIII/62?format=asciiRadiodefaultVIII/62/wenssCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameDesignation of the sourcemeta.id;meta.maincharf_Name[abmp] Several objects share the same namemeta.codecharRA1950Right Ascension B1950pos.eq.raDE1950Declination B1950pos.eq.decRAJ2000Right Ascension J2000pos.eq.ra;meta.mainindexedDEJ2000Declination J2000pos.eq.dec;meta.mainflg1[SMEC] source type flagmeta.codecharflg2[*] problems in fitting the sourcemeta.codecharSpeakPeak flux density at 330MHz in mJy/beammJyphot.flux.density;em.radio.200-400MHzintSintIntegrated flux density 330MHz in mJymJyphot.flux.density;em.radio.200-400MHzintMajAxisMajor axisarcsecphys.angSizeintMinAxisMinor axisarcsecphys.angSizeintPAPosition angle (North to East)degpos.posAngintNseLocal rms-noise level in mJy/beammJystat.snrfloatFrameFrame from which the source was obtainedpos.frame;obs.fieldchar