J/AJ/115/2587ivo://CDS.VizieR/J/AJ/115/2587doi:10.26093/cds/vizier.51152587CDSThompson R.J.Shelton R.G.Arning C.A.2023-04-06T16:50:28Z1999-10-27T11:13:35ZCDS support team

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

cds-question@unistra.frx-ray-sourcesWe have carried out a survey of the entire Einstein IPC database (a total of 5934 sources) to select objects with strong components of ultrasoft X-ray emission (i.e., emission below 0.5keV). The selection criteria are based on ratios of counts within three broad energy bands (i.e., X-ray "colors"). A total of 516 objects have been selected, with 202 (39%) having been identified through correlations with other databases. Of the currently identified objects, 45% are active galactic nuclei, 28% are stellar objects, 6% are "normal" galaxies and galaxy clusters, and the remaining 21% are "nonstellar" Galactic objects such as cataclysmic variables, pulsars, and white dwarfs. We present a discussion of the survey selection procedure, the list of selected sources, and discussions of interesting objects from the aforementioned groups. We discuss the remarkable success of our rather "low resolution" method of estimating spectral shape and present plans for follow-up studies of the as yet unidentified sources.1998AJ....115.2587Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/115/2587CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/13 : The 2E Catalogue (Harris+ 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/115/2587https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/115/2587http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/115/2587https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/115/2587https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/115/2587http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/115/2587GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/115/2587/table1 (Source information, Part I)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/115/2587/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/115/2587/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/115/2587/table1?GETtext/xml+votable180.050000true1.5334583-35.02776940.005555555555555556Cone search capability for table J/AJ/115/2587/table2 (Source information, Part II)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/115/2587/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/115/2587/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/115/2587/table2?GETtext/xml+votable180.050000true1.5334583-35.02776940.005555555555555556Einstein6/131 137 180 214 342 463 472 474-475 538 686 737 980 1058 1114 1443 1521 2155 2233 2250 2260-2261 2414 2464 2630 2709 3020 3073 3308 3819 4240 4280 4360-4361 4511 4649 4695 4790 4989 4991 5006 5009 5102 5200 5241 5312 5432 5483 5629 5694 5766 5838 5930 5982 6002 6037 6536 6853 7334 7355 7374 7606 7633 7664 7743 7769 8196 8283 8524 8548 8575 8631 8669 8673 8717 8778 8788 8793 8812 8845 8927 8963 8965-8966 8968 8971 9036 9072 9093 9129 9219 9272-9273 9359 9371 9397 9402 9442 9470 9476 9512 9925 10089 10131 10217 10220 10288 10312 10337 10386 10422 10473 10636 10755 10765 10771 10912 10927 11203 11252 11258-11259 11391 11411 11434 11448 11512 11591 11624 11636 11645 11673 11730 11960-11961 12024 12072 12074 12091 12121 12155 12581 12996 13024 13333 13935 13947 14056 14266 14643 14649 14692 14710 15064 15130 15241 15261 15577 15592 15594 15667 15683 15861 16023 16046 16059 16105 16187 16382 16411 16432 16584 16586 16655 16886 17487 17613 17713 17779 17848-17849 17979 17982 17984 17987 18003 18009 18027 18035 18060 18086 18097-18098 18194 18209 18321-18322 18666 18956 19023 19606 19842 19846 19848 20081 20176 20355 20618 20657 20659 20725 20764 20782-20783 20940 21039 21089 21348 21387 21433 21436 21438-21439 21670 21804 21968 21970 22300 22364-22365 22374 22517 22519 22544 22625 22804-22805 22854 22862 22870 22873 22909 22922 22947 22966 23101 23468 23525 23527 23533 23535 23537-23539 23546-23547 23549 23644 23678 23699 23705 23830 23853 23864 23952 24370 24420 24661 25205 25428 25580 25585 25647 25906 25965 25967 25981 26049 26083 26125 26210 26221 26280 26303 26316 26375 26542 26614 26753 26769 26783 27192 27224 27248 27383 27492 27494 27498 27514 27580 27582 27595 27612 27681 27728 27862-27863 27906 27913 27944-27945 27955 28026 28038 28141 28220-28221 28414 28491 28494 28527 28542 28583 28637 28646 28748 28920 29016 29340 29574 29798 30042 30543 30989 31532 31652 31781 31857 31984 31989 31998 32086 32089 32191-32192 33053 33095 33106 33112 33116 33225 33228 33295 33317 33328 33378 33639 33937 34093 34210 34216 34515 34534 34570 34896 35243 35585 35801 35993 36119 36141 36234 36276 36419 36621 37230-37231 37900 37907 37928 38016 38925 38955 39055 39079 39216 39245 39258 39804 39831 40242 40640 40728 40776 41598 41696 41763 42464 42749 42862 42981 43012 43227 43230 43671 43882 45564 45749 46399 46440 46459 46704 47011 47100 47103 47595 48615-48616 48707 48965https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/115/2587?format=asciiX-raydefaultJ/AJ/115/2587/table1Source information, Part IS/NSignal-to-noise rationstat.snrfloatRECO? Rib and edge codeinstr.paramintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIPCIPC numbermeta.id;meta.mainintprimarySourceObject source number in the fieldmeta.idintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainCountRateCount rate over the 0.2-4keV passband0.001count.s**-1phot.count;em.X-rayfloate_CountRaterms uncertainty on CountRate0.001count.s**-1stat.errorfloatIdentIdentification of optical counterpartmeta.id.crosscharJ/AJ/115/2587/table2Source information, Part IIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIPCIPC numbermeta.id;meta.mainintprimarySourceObject source number in the fieldmeta.idintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainC1Counts in the low (0.16-0.56keV) colour bandctphot.count;em.X-raydoublee_C1rms uncertainty on C1ctstat.errordoubleC2Counts in the medium (0.56-1.08keV) colour bandctphot.count;em.X-raydoublee_C2rms uncertainty on C2ctstat.errorfloatC3Counts in the high (1.08-3.5keV) colour bandctphot.count;em.X-raydoublee_C3rms uncertainty on C3ctstat.errorfloat