IX/24ivo://CDS.VizieR/IX/24CDSGiacconi et al.2012-11-13T06:12:01Z2003-11-19T15:33:24ZCDS support team

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

cds-question@unistra.frx-ray-sourcessurveysobservational-astronomyThe Einstein Observatory is the second of NASA's three High Energy Astrophysical Observatories, HEAO-2, renamed Einstein after launch, and was the first fully imaging X-ray telescope put into space. It observed in the energy range 0.2-20keV. It was launched on 12 November 1978, and remained in operation until April 1981. The High Resolution Imager (HRI) is one fo the four instruments aboard the Einstein Observatory, operating in the 0.2-3.0keV energy range, with a spatial resolution of a few arcseconds, and a field of view of 25arcmin. Field and source parameters observed with this instrument are given here. The HRI Instruments: The High Resolution Imager (HRI) has been described by Henry et al (Proc. SPIE, 106, 196, 1977) and by Giacconi, et al (1979ApJ...230..540G). The following summary is meant only as a convenient reference for features of the HRI with which users should be familiar. The Instrument: --------------- The performance characteristics of the telescope-HRI combination included: spatial resolution (FWHM): 3 arcsec at the telescope focus field of view: 24 arcmin on a side temporal resolution: 7.8125 microsec background in orbit: 0.46 cts/sec/arcmin**2 (away from the South Atlantic Anomaly) quantum efficiency: ~10% at 1 keV maximum event rate: 100 counts/sec. (telemetry limited) dead time correction: median of 1.02 for mission energy range: 0.15-3.0 keV (HRI-2) 0.15-3.5 keV (HRI-3) The mirror effective area decreased as a function of off-axis angle to 0.9 at 15 arcminutes. This "vignetting" must be taken into account when calculating count rates. The quantum efficiency of the microchannel plates varied by +/-5% across the field of view of the HRI, which must also be allowed for in determining source strengths. The two-dimensional HRI used a pair of cascaded microchannel plates (MCPs) as an X-ray image converter and photoelectron multiplier, and a crossed-wire grid as a two-dimensional position-sensitive charge detector. Position determination was accomplished by electronic interpolation between the coarse grid wires. The detector provided the arrival time and position of each X-ray event which occurred within the field of view. The MCP photocathode surface was shielded from ultraviolet light and ions by a thin, metallized self-supporting plastic filter. This UV/ion shield was the only component to differ among the three HRIs on-board the Einstein Observatory. HRI-2 showed a splotchy artifact early in the mission; from December 15, 1978, therefore, HRI-3 was used instead. An Objective Grating Spectrometer (OGS) could be used in conjunction with the HRI. 53 sequences were observed with this configuration. These sequences have not been included in the current HRI source list. Point Response Function: ------------------------ An analytical approximation to the Point Response Function (PRF) for the HRI at 1.5 keV has been given by J.P. Henry: PSF(r) = 0.02885 x [ exp (-r/1.96") + 0.01 exp (-r/12.94") ] /arcsec**2 This was derived from long exposures of point sources on axis, and appears to be a reasonably accurate description within 5 arcminutes of the field center for sources such as Cyg X-2 and 3C273 (i.e., for sources with non-pathological spectra). The formula is also a good fit to the 1.5 keV ground calibration data. It is valid for r < 1'.The Einstein Observatory (HEAO-2) (1979)https://cdsarc.cds.unistra.fr/viz-bin/cat/IX/24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=IX/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=IX/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=IX/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=IX/24https://vizier.iucaa.in/viz-bin/votable?-source=IX/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=IX/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table IX/24/hrifield (Field Parameters for the HRI Source List)https://vizier.cds.unistra.fr/viz-bin/conesearch/IX/24/hrifield?https://vizier.iucaa.in/viz-bin/conesearch/IX/24/hrifield?http://vizieridia.saao.ac.za/viz-bin/conesearch/IX/24/hrifield?GETtext/xml+votable180.050000true1.5804220.202480.005555555555555556Cone search capability for table IX/24/hrisrc (Source Parameters for the HRI Source List)https://vizier.cds.unistra.fr/viz-bin/conesearch/IX/24/hrisrc?https://vizier.iucaa.in/viz-bin/conesearch/IX/24/hrisrc?http://vizieridia.saao.ac.za/viz-bin/conesearch/IX/24/hrisrc?GETtext/xml+votable180.050000true1.5804220.203040.005555555555555556Einstein5/2693 8274 8278 8281 6/141 207 463 472 579 1129 1196 1260 1466 1469 1504 1546 1558 1694 1701 1704 2154 2155 2214 2227 2317 2388 2432 2460 2572 2622 2623 2666 2708 2709 3020 3063 3256 3258 3308 3309 3310 3389 3633 3681 3728 4341 4790 4802 4923 5009 5190 5423 5550 5558 5674 5715 5976 6098 6122 6389 6923 6977 7264 7426 7606 7743 7752 7768 7814 8068 8220 8264 8268 8271 8452 8486 8510 8514 8526 8528 8555 8575 8767 8790 8922 8972 9036 9037 9050 9287 9354 9442 9468 9506 9512 9612 9633 9717 10008 10217 10219 10220 10271 10312 10379 10385 10386 10387 10471 10637 10716 10743 10752 10761 10771 10780 10818 10819 10856 10911 10912 10977 11027 11109 11111 11434 11593 11614 11626 11638 11645 11730 11736 11813 11898 11943 12025 12074 12075 12118 12121 12123 12405 12531 12604 12684 12698 12943 12962 12975 13007 13209 13211 13212 13214 13234 13250 13256 13414 13444 13875 13947 14018 14056 14285 14305 14454 14533 14622 14632 14690 14692 14744 14858 14906 15090 15112 15320 15410 15433 15471 15638 15903 15969 16029 16056 16066 16075 16131 16301 16543 16655 16886 16900 16926 17075 17137 17192 17237 17300 17500 17727 17755 17828 17984 17985 17987 18009 18016 18041 18236 18365 18398 18652 18683 18712 18748 18902 19091 19094 19101 19151 19283 19432 19513 19797 19846 19848 19883 19912 19935 19970 20355 20481 20624 20940 21017 21060 21170 21373 21436 21438 21439 21450 21690 21766 22159 22249 22289 22300 22364 22544 22577 22579 22625 22629 22708 22709 22787 22804 22805 22854 22855 22884 22959 22970 23010 23027 23134 23197 23323 23451 23652 23830 23952 23995 24185 25873 26083 26125 26168 26292 26313 26316 26362 26563 26569 26833 27227 27448 27515 27554 27719 27736 27738 27743 27765 27767 27773 27907 27914 27980 28033 28035 28036 28226 28249 28251 28361 28517 28595 28631 28705 28707 28745 28751 28762 28778 28792 28805 28808 28816 28830 28835 28849 28864 28879 28889 28890 28891 28896 28899 28905 28913 28925 28959 28970 29094 29114 29193 29195 29234 29257 29259 29267 29289 29294 29304 29306 29307 29463 29505 29523 29570 29632 29718 29795 29832 29870 29923 30245 30259 30262 30298 30299 30312 30315 30317 30319 30334 30362 30402 30439 30506 30508 30543 30580 30581 30595 30618 30657 30692 30702 30709 30753 30818 30833 30941 31019 31043 31115 31174 31487 31498 31534 31716 31751 32083 32261 32500 32645 32656 32790 32983 33049 33052 33053 33055 33077 33079 33088 33089 33091 33094 33095 33100 33106 33108 33110 33116 33120 33121 33163 33235 33298 33306 33315 33318 33321 33323 33328 33330 33628 33713 33716 33801 33866 33958 34242 34243 34492 34493 34881 35214 36261 36786 37294 37306 37343 37410 37513 37537 37632 37732 37770 37897 37904 37906 37925 37929 37937 37939 38016 38028 38081 38487 38653 38916 38919 39118 39216 39235 39266 39267 39272 39366 39397 39459 39520 39607 39642 39885 39886 39901 39916 39937 40013 40124 40410 40432 40583 40615 40809 40838 41279 41295 41399 41412 41446 41510 41583 41591 41596 41624 41650 41679 41681 41697 41701 41758 41760 41763 41802 41809 41812 41815 42140 42169 42196 42210 42215 42229 42314 42315 42384 42387 42394 42441 42464 42467 42496 42533 42666 42841 42876 42981 42990 43009 43014 43020 43033 43227 43262 43523 43626 43837 43849 43874 43877 43881 43947 44086 44284 44523 44805 44908 45474 45480 45641 46704 47014 47053 47063 47102 47588 47589 47868 48035 48698 48798 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/IX/24?format=asciiX-raydefaultIX/24/hrifieldField Parameters for the HRI Source ListFlgFldField Flag (11)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAB1950Right Ascension (B1950)pos.eq.ra;meta.mainDEB1950Declination (B1950)pos.eq.dec;meta.mainSeqnoSequence number of observation (G1)obs.fieldintprimaryGLONGalactic longitude of field center (1)degpos.galactic.lonGLATGalactic latitude of field center (1)degpos.galactic.latfloatnHColumn density (2)cm**-2phys.columnDensitydoublerollAngAngle which measures the roll of spacecraft (3)radpos.posAngdoubleExpTimeEffective exposure time (4)stime.duration;obs.exposuredoubleYposAverage y offset in pixels (5)pixinstr.saturationfloatZposAverage z offset in pixels (5)pixinstr.saturationfloatRotAverage rotation offset (5)radinstr.saturationdoubleInstrFocal plane detector (6)instr.tel.focalLength;instr.detcharObsObserver number (7)meta.id;obsintStrtDate (Day) the observation started (8)time.epochStopDate (Day) the observation ended (8)time.epochStrt.sStart time of observation (8)stime.epochdoubleStop.sEnd time of observation (8)stime.epochdoubleJD-2442500Offseted Julian date of observation (9)dtime.epochdoubledatamaxMaximum number of detected photons/pixel (10)ph/pixphot.count;em.X-rayintFITSnameFITS file name (12)meta.id;meta.filecharObsTitleThe title of the observationmeta.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.decnullableindexedIX/24/hrisrcSource Parameters for the HRI Source ListrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAB1950Right Ascension (B1950)pos.eq.ra;meta.mainDEB1950Declination (B1950)pos.eq.dec;meta.mainSeqnoSequence number for the observation (G1)obs.fieldintFOSnoField Ordered Source Number (1)meta.idinterrPosPositional uncertainty (90% confidence) (2)radstat.error;stat.fit.paramdoublecCRateCorrected Count rate of source (3)ct/sphot.count;em.X-raydoublee_cCRateCorrected Count rate error (3)ct/sstat.errordoubleSNRSignal to noise ratio (4)stat.snrdoublesrcflagSource flags (5)meta.codechar_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.decnullableindexedIX/24/obsnamesEinstein ObserversrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsThe observer's identifying numbermeta.id;obsintprimaryObsNameThe observer's name and institutionmeta.id;obs.observer;instr.obstychar