J/MNRAS/474/5008ivo://CDS.VizieR/J/MNRAS/474/5008doi:10.26093/cds/vizier.74745008CDSde Gasperin F.Intema H.T.Frail D.A.2024-08-18T20:17:39Z2021-02-16T07:57:14ZCDS support team

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

cds-question@unistra.frradio-sourcesradio-continuum-emissionThe radio spectral index is a powerful probe for classifying cosmic radio sources and understanding the origin of the radio emission. Combining data at 147MHz and 1.4GHz from the TIFR GMRT Sky Survey (TGSS) and the NRAO VLA Sky Survey (NVSS), we produced a large-area radio spectral index map of ~80 per cent of the sky (Dec. >-40deg), as well as a radio spectral index catalogue containing 1396515 sources, of which 503647 are not upper or lower limits. Almost every TGSS source has a detected counterpart, while this is true only for 36 per cent of NVSS sources. We released both the map and the catalogue to the astronomical community. The catalogue is analysed to discover systematic behaviours in the cosmic radio population. We find a differential spectral behaviour between faint and bright sources as well as between compact and extended sources. These trends are explained in terms of radio galaxy evolution. We also confirm earlier reports of an excess of steep-spectrum sources along the galactic plane. This corresponds to 86 compact and steep-spectrum source in excess compared to expectations. The properties of this excess are consistent with normal non-recycled pulsars, which may have been missed by pulsation searches due to larger than average scattering along the line of sight.2018MNRAS.474.5008Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/474/5008CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (Intema+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/474/5008https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/474/5008http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/474/5008https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/474/5008https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/474/5008http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/474/5008GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/474/5008/spidxcat (*Spectral index catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/474/5008/spidxcat?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/474/5008/spidxcat?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/474/5008/spidxcat?GETtext/xml+votable180.050000true348.91525033137.9287213490.0055555555555555560/0 2-3 1/7 17-19 21-23 25-27 29-31 2/16-18 20-21 23 27 65-67 81-83 97-99 113-115 141-143 157-159 173-175 189-191 3/88-89 91 96-97 102-103 105-107 257-259 321-323 385-387 449-451 541-543 551 557-559 561-563 605-607 621-623 625-627 669-671 685-687 689-691 733-735 747 749-751 753-755 4/304-306 309 361-363 392-394 399 402-403 405-407 417-419 1025-1027 1281-1283 1537-1539 1793-1795 2141-2143 2157-2159 2161-2163 2221-2223 2225-2227 2241-2243 2397-2399 2413-2415 2417-2419 2461-2463 2477-2479 2481-2483 2497-2499 2653-2655 2669-2671 2673-2675 2717-2719 2733-2735 2737-2739 2753-2755 2909-2911 2925-2927 2929-2931 2973-2975 2993-2995 3009-3011 5/1232-1233 1235 1244-1245 1248 1258-1259 1271 1275 1277-1279 1441-1443 1581-1583 1585-1588 1590-1593 1595 1600-1601 1603-1604 1606-1607 1617-1619 1664 1666-1667 4097-4099 5121-5123 6145-6147 7169-7171 8541-8543 8557-8559 8561-8563 8605-8607 8621-8623 8625-8627 8641-8643 8797-8799 8807 8813-8815 8861-8863 8877-8879 8881-8883 8897-8899 8961-8963 9565-9567 9581-9583 9585-9587 9629-9631 9645-9647 9649-9651 9665-9667 9821-9823 9837-9839 9841-9843 9885-9887 9901-9903 9905-9907 9921-9923 9985-9987 10589-10591 10605-10607 10609-10611 10653-10655 10669-10671 10673-10675 10689-10691 10845-10847 10861-10863 10865-10867 10909-10911 10925-10927 10929-10931 10945-10947 11009-11011 11607 11613-11615 11629-11631 11633-11635 11671 11677-11679 11693-11695 11697-11699 11713-11715 11869-11871 11885-11887 11889-11891 11933-11935 11949-11951 11969-11971 12033-12035 6/4912-4914 4916-4917 4920 4922 4936 4938 4960 4985 4988-4989 4991 4996-4997 5000-5002 5026-5027 5030 5050 5077 5105-5107 5760-5761 5763 6320 6322-6323 6336-6338 6356 6358-6359 6376-6377 6379 6409-6411 6422 6466-6467 6661-6663 16385-16387 20481-20483 24577-24579 28673-28675 34141-34143 34157-34159 34161-34163 34205-34207 34221-34223 34225-34227 34241-34243 34397-34399 34413-34415 34417-34419 34461-34463 34477-34479 34481-34483 34497-34499 34561-34563 35165-35167 35181-35183 35185-35187 35245-35247 35249-35251 35421-35423 35435 35437-35439 35441-35443 35485-35487 35499 35501-35503 35505-35507 35521-35523 35585-35587 35841-35843 38237-38239 38253-38255 38257-38259 38301-38303 38317-38319 38321-38323 38337-38339 38493-38495 38509-38511 38513-38515 38557-38559 38573-38575 38577-38579 38593-38595 38657-38659 39261-39263 39277-39279 39281-39283 39325-39327 39341-39343 39345-39347 39361-39363 39517-39519 39533-39535 39537-39539 39581-39583 39595 39597-39599 39601-39603 39617-39619 39681-39683 39937-39939 42333-42335 42349-42351 42353-42355 42397-42399 42411 42413-42415 42417-42419 42433-42435 42589-42591 42605-42607 42609-42611 42653-42655 42669-42671 42673-42675 42689-42691 42753-42755 43357-43359 43373-43375 43377-43379 43421-43423 43437-43439 43441-43443 43457-43459 43613-43615 43629-43631 43633-43635 43675 43677-43679 43693-43695 43697-43699 43713-43715 43777-43779 44033-44035 46445-46447 46449-46451 46493-46495 46509-46511 46513-46515 46529-46531 46701-46703 46705-46707 46749-46751 46765-46767 46769-46771 46785-46787 46849-46851 47453-47455 47469-47471 47473-47475 47517-47519 47533-47535 47537-47539 47553-47555 47709-47711 47725-47727 47729-47731 47773-47775 47789-47791 47793-47795 47873-47875 48129-481319.740322260453885e-26 9.276497240453405e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/474/5008?format=asciiRadiodefaultJ/MNRAS/474/5008/spidxcat*Spectral index cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000) (weighted average of NVSS and TGSS detections for Scode=SMCI)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000) (weighted averagedegpos.eq.dec;meta.mainindexedFtotNVSS? NVSS 1.4GHz total flux (sum of detections fluxes for Scode=I, set to 0 for Scode=U)Jyphot.flux.density;em.radio.750-1500MHzfloatnullablee_FtotNVSS? rms uncertainty on FtotNVSS (quadratic mean of detection errors for Scode=I, set to 0 for Scode=U)Jystat.errorfloatnullableFpeakNVSS? NVSS 1.4GHz peak flux (maximum of detections peak fluxes for Scode=I, set to 0 for Scode=U)Jy/beamphot.flux.density;em.radio.750-1500MHzfloatnullablee_FpeakNVSS? rms uncertainty on FpeakNVSS (error relative to the maximum of detections peak fluxes for Scode=I, set to 0 for Scode=U)Jy/beamstat.errorfloatnullablermsNVSSNVSS local rms noiseJy/beaminstr.det.noisedoubleFtotTGSS? TGSS 147MHz total flux (sum of detections fluxes for Scode=I, set to 0 for Scode=L)Jyphot.flux.density;em.radio.100-200MHzfloatnullablee_FtotTGSS? rms uncertainty on FtotTGSS (quadratic mean of detections error for Scode=I, set to 0 for Scode=L)Jystat.errorfloatnullableFpeakTGSS? TGSS 147MHz peak flux (maximum of detections peak fluxes for Scode=I, set to 0 for Scode=L)Jy/beamphot.flux.density;em.radio.100-200MHzfloatnullablee_FpeakTGSS? rms uncertainty on FpeakTGSS (error relative to the maximum of detections peak fluxes for Scode=I, set to 0 for Scode=L)Jy/beamstat.errorfloatnullablermsTGSSLocal rms noiseJy/beaminstr.det.noisedoubleSpIndexSpectral index between 147MHz and 1.4GHzspect.index;em.radio.100-200MHzdoublee_SpIndexSpectral index error (set to 0 for Scode=LU)stat.errordoubles2nPeak flux over Island rmsphot.flux;arith.ratiodoubleScode[SMCILU] Source code (1)meta.codecharNmatchNumber of matched sources in the same islandmeta.numberintNunmaNVSSNumber of NVSS unmatched sources in the same islandmeta.numberintNunmaTGSSNumber of TGSS unmatched sources in the same islandmeta.numberintIslId[30/1855370] Island identification numbermeta.idintSourceId[0/1396514] Unique source identification numbermeta.id;meta.mainint