IX/4ivo://CDS.VizieR/IX/4CDSForman W.Jones C.Cominsky L.Julien P.Murray S.Peters G.,Tananbaum H.Giacconni R.2012-07-31T09:28:27Z2012-07-12T08:04:58ZCDS support team

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

cds-question@unistra.frx-ray-sourcesThe Fourth Uhuru (4U) Catalog lists 339 X-ray sources that were observed with the Uhuru (SAS A) X-ray observatory. It contains positional information in the form of 90% confidence level error boxes, 2-6keV intensities, possible optical and radio counterparts, and alternative names for sources observed in earlier compilations. The major classes of identified objects include binary stellar systems, supernova remnants, Seyfert galaxies, clusters of galaxies, and possibly the new class of superclusters of galaxies. The Uhuru satellite was a scanning X-ray instrument with a narrow (1 by 10 degree FWFM) and a wide (10 by 10 degree FWFM) collimator (cf. Giacconi et al. 1971ApJ...165L..27G). Typically, the scan rate was 0.5degree/second, with the spin axis in one position for roughly one day. During the interval for which the spin axis was fixed, repeated scans were made of the same 10 by 360 degrees band of the sky. For this catalog, the individual scans were superposed using aspect data from an orthogonally mounted triad of magnetometers and a Sun sensor onboard the spacecraft, supplemented by observations of well-located X-ray sources. The observations employed in producing this catalog were obtained over a total of 429 days between 1970 December 12 and 1973 March 18, apart from a gap between 1972 July and December when the spacecraft's transmitter was operating improperly.1978ApJS...38..357Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/IX/4CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/6 : Positions of X-Ray Sources, 2nd ed. (Dolan 1983)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=IX/4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=IX/4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=IX/4https://vizier.cds.unistra.fr/viz-bin/votable?-source=IX/4https://vizier.iucaa.in/viz-bin/votable?-source=IX/4http://vizieridia.saao.ac.za/viz-bin/votable?-source=IX/4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table IX/4/4u (4th Uhuru catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/IX/4/4u?https://vizier.iucaa.in/viz-bin/conesearch/IX/4/4u?http://vizieridia.saao.ac.za/viz-bin/conesearch/IX/4/4u?GETtext/xml+votable180.050000true70.727927-88.1143010.005555555555555556SAS-16/207 260 941 1197 1231 1333 1466 1604 1690 1749 2007 2432 2538 2566 2609 2622 2721 3023 3031 3045 3072 3089 3172 3285 3320 3633 3642 3746 3819 6846 7025 7650 7856 7921 8063 8447 8514 8638 8740 8922 8966 9037 9277 9352 9468 9490 9512 9552 9613 10304 10379 10588 10912 11133 11460 11593 11724 12121 12271 12576 13166 13174 13254 13258 13347 13386 13444 13682 13878 14056 14251 14296 14317 14452 14551 14555 14561 14633 14690 14692 14706 14738 14876 14883 14984 15090 15113 15370 15410 15473 15478 15639 15903 15969 16075 16300 16458 16478 16608 16716 17237 17506 17514 18016 18110 18699 19286 19513 19603 19884 19936 20015 20020 20120 20230 20368 20492 20574 20626 20854 21010 21051 21439 21600 22072 22088 22218 22580 22631 22726 22834 22979 23007 23234 23326 23454 23653 23668 23936 23997 24162 24188 24452 24468 24576 25215 25221 25224 25389 25401 25457 25541 25905 26124 26209 26293 26360 26413 26563 27936 28243 28705 28721 28760 28802 28828 28838 28849 28888 28896 28925 28957 28973 29112 29179 29205 29232 29257 29305 29444 29463 29513 29537 29567 29868 29926 30239 30246 30299 30328 30332 30361 30437 30507 30581 30599 30619 30695 30753 30826 30839 31031 31175 31516 31930 32483 32493 32631 32659 32772 32783 32790 32894 33049 33094 33113 33235 33298 33318 33426 33625 33801 33970 34068 34241 34281 34444 34664 34714 34882 35622 35926 36085 36744 36950 37207 37288 37732 37770 37853 37865 37881 37906 37925 37935 37939 38022 38199 38263 38485 38571 38824 38829 38853 38881 39012 39072 39088 39118 39203 39235 39245 39267 39366 39459 39541 39605 39686 39783 39885 39977 40007 40086 40434 40611 40619 40808 41020 41053 41127 41279 41326 41399 41444 41530 41596 41629 41662 41675 41677 41756 41768 41790 41803 41821 41872 42140 42157 42196 42207 42211 42215 42313 42385 42432 42436 42443 42468 42489 42544 42554 42666 42803 42836 42911 42994 43009 43014 43035 43236 43261 43625 43652 43836 43843 43948 44117 44227 44635 45168 45199 45644 45738 45804 45888 47145 47842 48035https://cdsarc.cds.unistra.fr/viz-bin/moc/IX/4?format=asciiX-raydefaultIX/4/4u4th Uhuru cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint4U4U name (HHMM+DD)meta.id;meta.maincharRAB1950Right ascension (B1950) (1)pos.eq.ra;meta.mainDEB1950Declination (B1950) (1)pos.eq.dec;meta.maina90Area of the 90% confidence level error boxdeg**2stat.errorfloatCRCount rate (2)ct/sphot.count;em.X-raydoublee_CR? rms uncertainty on CR (3)ct/sstat.errorfloatnullablel_varLimit flag on varmeta.code.errorcharvar? Ratio of the maximum to minimum observed count rate, max_to_min_ratio (4)src.var.indexfloatnullableFluxX-ray flux in the 2-6keV band (erg/cm^2^/s) (5)mW.m**-2phot.flux;em.X-raydoublee_Flux? rms uncertainty on FluxmW.m**-2stat.error;phot.fluxdoublenullableFluxCX-ray flux in the 2-6keV band, in milliCrabs (6)mCrabphot.flux;em.X-raydoublee_FluxC? rms uncertainty on FluxCmCrabstat.errorfloatnullableComComments (7)meta.notechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed