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IX/15 Einstein EMSS Survey (Gioia+ 1990, Stocke+ 1991)
(Previously numbered VII/152)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
catalog.dat
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Query from: http://vizier.cds.unistra.fr/cgi-bin/VizieR?-source=IX/15
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-r--r--r-- 1 cats archive 128337 Aug 29 1997 catalog.dat [txt] [txt.gz] [fits] [fits.gz] [html]
-r--r--r-- 1 cats archive 20039 Jul 19 1993 notes.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe :IX/15 Einstein EMSS Survey (Gioia+ 1990, Stocke+ 1991)
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The EINSTEIN Observatory Extended Medium-Sensitivity Survey (EMSS)
Gioia I.M., Maccacaro T., Schild R.E., Wolter A.
<Astrophys. J. Suppl. Ser. 72, 567 (1990)>
=1990ApJS...72..567G
Stocke J.T., Morris S.L., Gioia I.M., Maccacaro T., Schild R.E.,
Wolter A., Fleming T.A., Henry J.P.
<Astrophys. J. Suppl. Ser. 76, 813 (1991)>
=1991ApJS...76..813S
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ADC_Keywords: X-ray sources ; Active gal. nuclei ; BL Lac objects ;
Clusters, galaxy ; Galactic plane ;
Mission_Name: Einstein
Description:
The Einstein Extended Medium Sensitivity Survey (EMSS) consists
of 835 serendipitous X-ray sources detected at or above 4 times the
rms level in 1435 IPC fields with their centers located away from the
galactic plane. Their limiting sensitivities range from 5*10-14 to
to 3*10-12 erg.cm-2.s-1 in the 0.3-3.5keV band. A total area of 778
square degrees of the high galactic latitude sky (|b|>20) has been
covered. The analysis has been performed using data from the Rev 1
processing system at the CfA.
The resulting EMSS catalog is a flux-limited and homogeneous
sample of astronomical objects that can be used for statistical
studies. Here we present the table listing all the sources taken from
the publication referenced below and the optical identifications. At
present over 96% of the 835 X-ray sources have been successfully
identified in the following proportions: active galactic nuclei (QSO's,
quasars and Seyfert), 51.1%; BL Lacertae objects, 4.3%; clusters of
galaxies, 12.2%; normal galaxies, 2.1%; cooling flow galaxies, 0.6%;
Galactic stars 25.8%; and unidentified, 3.9%. Most of the individual
optical counterparts are previously unknown objects and so constitute
large statistical samples independent of previously selection methods.
The contents of the table is described below. The sky coverage
computed for a specific assumed source spectrum is also given under
"Additional Information" below. For further details please see the
published articles: Gioia et al. 1990, Stocke et al. 1991.
Additional Information:
The EMSS sky coverage.
----------------------
This sky coverage has been produced using the counts in the
standard detection algorithm and assuming a power law spectrum with
energy index = 1 and the measured Galactic hydrogen column density in
the direction of each IPC pointing. We caution the user that this sky
coverage is not appropriate for computation of functions like
logN(>S)-logS, or Luminosity Functions of resolved sources, like
clusters of galaxies or "normal" galaxies, nor of stars. The fluxes
for these objects have been calculated either using extended counts,
when appropriate, and/or different assumptions for the incident
spectrum (see below).
Limiting Sensitivity Area Covered
(erg/cm**2/s) (sq. deg)
5.08E-14 0.09
6.09E-14 0.72
7.31E-14 2.54
8.78E-14 6.37
1.05E-13 15.1
1.26E-13 29.4
1.52E-13 55.2
1.82E-13 94.2
2.18E-13 139.4
2.62E-13 191.6
3.14E-13 249.5
3.77E-13 319.1
4.53E-13 402.0
5.43E-13 497.0
6.52E-13 582.9
7.83E-13 657.7
9.39E-13 711.8
1.13E-12 743.7
1.35E-12 762.7
1.62E-12 771.9
1.95E-12 775.7
2.34E-12 777.4
2.80E-12 777.9
3.36E-12 778.1
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