ACDS V10.0 - Mon Apr 22 09:36:27 CEST 2019
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Detailed Description of IX/13 : The 2E Catalogue (Harris+ 1994)
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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.
IX/13 The 2E Catalogue (Harris+ 1994)
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EINSTEIN Observatory catalog of IPC X-ray sources
Harris D.E., Forman W, Gioa I.M., Hale J.A., Harnden Jr. F.R., Jones C.,
Karakashian T., Maccacaro T., McSweeney J.D., Primnini F.A., Schwarz J.,
Tananbaum H.D., Thurman J.
<SAO HEAD CD-ROM Series I (Einstein), Nos 18-36 (1994)>
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ADC_Keywords: X-ray sources
Mission_Name: Einstein
Description:
This catalog contains sources from EINSTEIN IPC (Imaging Proportional
counter aboard the EINSTEIN (HEAO 2) satellite, in orbit between
November 1978 and April 1981) detected during pointed observations.
Note that a single source may have more than one entry in the catalog.
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× 2e.dat 114 5948 The catalogue
See also:
The IPC Slew Survey (1ES) catalog
ftp://einline.harvard.edu : the Einstein On-Line System FTP service
http://hea-www.harvard.edu/einstein/Ein_home/ein_welcome.html :
the Einstein Home Page at Harvard.
Byte-by-byte Description of file: 2e.dat
Bytes Format Units Label Explanations
1- 4 I4 --- CATNUM [1/4809]+= Catalogue number of the source (1)
5- 10 I6 --- SEQNUM Sequence number for the observation
11- 13 I3 --- FLDNUM Field number of the source
14- 16 I3 h RAh Right ascension 1950 (hours)
17- 19 I3 min RAm Right ascension 1950 (minutes)
20- 24 F5.1 s RAs Right ascension 1950 (seconds)
26 A1 --- DE- Declination 1950 (sign)
27- 28 I2 deg DEd Declination 1950 (degrees)
29- 31 I3 arcmin DEm Declination 1950 (minutes)
32- 34 I3 arcsec DEs Declination 1950 (seconds)
35- 38 I4 arcsec PosErr Positional error (arcsec)
39- 48 F10.5 ct/s Crate Corrected count rate
49- 56 F8.5 ct/s e_Crate Error on the count rate
57- 64 F8.1 s LivTime Live time (in seconds, at the field center)
65- 73 F9.1 --- NetCount Net counts in the detect cell
74- 81 F8.1 --- BkgCount Background counts in the detect cell
82- 87 F6.1 --- S/N Signal to noise ratio for the detection
88- 94 F7.1 --- SizCor Size correction factor (2)
95- 99 I5 --- RECode Ribs and edges code (3)
100-104 F5.1 arcmin OffAxis Dist. between source & field center (arcmin)
105-110 A6 --- SrcFlag [AaHLEI ] Source flags (4)
111-114 A4 --- RefFlag Reference and identification flag (5)
Note (1): The name can either be of the form 2E CATNUM, or be based on 1950
positions (format 2E HHMM.M+DDMM)
Note (2): The size correction is a factor which serves to correct all
intensity measurements (optimized for point sources) of resolved
sources for the x-ray flux ignored by the detection box measurements.
SizCor is defined as the ratio of the intensity contained within the 3
sigma contour to the intensity within the detection box (2.4'x2.4'),
the latter value corrected for the point response function and mirror
scattering.
Note (3): RECode is a numeric flag with non-zero values indicating that the
detection cell falls near or on a rib shadow or detector edge. The
code contains two embedded numbers expressed in 4 digits: the first
two (thousands and hundreds) give the total number (max # = 16) of
frame subcells shadowed by the ribs or masked field edge; the last
two (tens and units digits) give the total number of subcells
(maximum = 09) within the detect box which are shadowed.
Note (4): The flags are:
A - additional detections of this source were achieved in other
observations
a - Probably should be paired with another detection; but separation
exceeded cutoff and thus not assigned an "A" flag.
H - a hardness ratio is available
L - the source was detected only with the local detect method
E - intensity corrected for source near the exposure cutoff at
the field edge.
I - source detected by local detect near a field edge. Intensity
adjusted to remove redundant exposure corrections.
Note (5): The reference indicator serves to alert the user to
the following bibliographic information:
AGN Active Galactic Nucleus
BL BL Lac object
CLG Cluster (or group) of galaxies
CV Cataclysmic Variable
G Galaxy
GLB Globular Cluster
P Pulsar
Q Quasar
RS Radio source
S Star
SNR Supernova Remnant
SY Seyfert Galaxy
* Reference available, but no optical class
+ Generic indicator which means possible ID lies from
100-150 arcseconds from source location.
History:
The catalogue was prepared from the Einline version by
Jean-Marie Hameury (Strasbourg Observatory) in October 1996.
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(End) Jean-Marie Hameury [Strasbourg] 1996-Oct-25