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Detailed Description of J/AJ/115/2587 :
Einstein IPC database ultrasoft survey (Thompson+ 1998)

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Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.
J/AJ/115/2587       Einstein IPC database ultrasoft survey (Thompson+ 1998)
================================================================================
Initial results of a comprehensive ultrasoft survey of the Einstein IPC
database: source list and confirmation of the selection procedure.
     Thompson R.J., Shelton R.G., Arning C.A.
    <Astron. J. 115, 2587 (1998)>
    =1998AJ....115.2587T
================================================================================
ADC_Keywords: X-ray sources

Mission_Name: Einstein

Keywords: binaries: close - pulsars: general - surveys - white dwarfs -
          X-rays

Abstract:
    We 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.

File Summary:

FileName Lrecl Records Explanations
× 80 . This file × ReadMe 80 . This file × table1.dat 90 516 Source information, Part I × table2.dat 86 516 Source information, Part II
See also: IX/13 : The 2E Catalogue (Harris+ 1994) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- IPC IPC number 7- 8 I2 --- Source Object source number in the field 10- 11 I2 h RAh Right ascension (J2000.0) 13- 14 I2 min RAm Right ascension (J2000.0) 16- 20 F5.2 s RAs Right ascension (J2000.0) 22 A1 --- DE- Declination sign 23- 24 I2 deg DEd Declination (J2000.0) 26- 27 I2 arcmin DEm Declination (J2000.0) 29- 33 F5.2 arcsec DEs Declination (J2000.0) 35- 40 F6.2 10-3ct/s CountRate Count rate over the 0.2-4keV passband 43- 48 F6.3 10-3ct/s e_CountRate rms uncertainty on CountRate 50- 53 F4.1 --- S/N Signal-to-noise ration 55- 58 I4 --- RECO ? Rib and edge code 60- 90 A31 --- Ident *Identification of optical counterpart
Note on Ident: one error corrected, see the "History" section below.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- IPC IPC number 7- 8 I2 --- Source Object source number in the field 10- 11 I2 h RAh Right ascension (J2000.0) 13- 14 I2 min RAm Right ascension (J2000.0) 16- 20 F5.2 s RAs Right ascension (J2000.0) 22 A1 --- DE- Declination sign 23- 24 I2 deg DEd Declination (J2000.0) 26- 27 I2 arcmin DEm Declination (J2000.0) 29- 33 F5.2 arcsec DEs Declination (J2000.0) 35- 43 F9.3 ct C1 Counts in the low (0.16-0.56keV) colour band 45- 52 F8.3 ct e_C1 rms uncertainty on C1 54- 61 F8.3 ct C2 Counts in the medium (0.56-1.08keV) colour band 63- 69 F7.3 ct e_C2 rms uncertainty on C2 71- 78 F8.3 ct C3 Counts in the high (1.08-3.5keV) colour band 80- 86 F7.3 ct e_C3 rms uncertainty on C3
Table 3: Classes of objects ------------------------------------------------------------- Class Percentage of identified sources ------------------------------------------------------------- Active galactic nuclei 45 Stellar 28 Normal galaxies and galaxy clusters 6 Cataclysmic variables (AM Herculis stars) 4 PG 1159 objects/planetary nebulae 1 DA white dwarfs 9 X-ray binaries 3 Pulsars 1 T Tauri stars 2 W UMa variables/symbiotic stars 1 History: From AJ electronic version * 27-Oct-1999: Corrected SAO number in table1 for source IPC 3727 (is SAO 110135, not SAO 10135) ================================================================================ (End) James Marcout, Patricia Bauer [CDS] 31-Aug-1998