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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
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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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