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EINSTEIN2E - Einstein Observatory 2E Catalog of IPC X-Ray Sources |
HEASARC Archive |
This catalog contains sources with signal to noise values of 3.5 and greater from Einstein IPC observations. Note that a single source may have more than one entry in this catalog.
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)>
Name
This is the 2E Catalog Designation as created by the HEASARC based
on appending the 1950 Coordinates to the "2E " prefix in the recommended IAU
way, and as recognized by the Dictionary of Astronomical Nomenclature.
Alt_Name
This the alternative 2E Catalog Designation as created by the
HEASARC based on appending the 2E Catalog Number to the "2E " prefix. This
alternate source naming convention is also recognized by the Dictionary
of Astronomical Nomenclature.
RA
The Right Ascension of the X-ray source in the selected equinox.
This was given in 1950 coordinates to a precision of 0.1 seconds of time
in the original CDS table.
Dec
The Declination of the X-ray source in the selected equinox.
This was given in 1950 coordinates to a precision of 1 arcsecond
in the original CDS table.
LII
The Galactic Longitude of the X-ray source.
BII
The Galactic Latitude of the X-ray source.
Catalog_Number
The 2E Catalog Number representing a unique source:
note that a single source may have more than one entry in this catalog.
Sequence_Number
The Einstein Sequence Number (ESN) of the IPC observation
in which the source was detected.
Field_Number
A running field number within a given IPC observation as
identified by the Einstein Sequence Number. Each entry has a unique
combination of sequence_number and field_number, therefore.
Error_Radius
The positional error radius of the X-ray source,
in arcseconds.
Count_Rate
The corrected count rate, in counts per second.
Count_Rate_Error
The error in the count rate, in counts per second.
Live_Time
The live time (essentially the exposure time) of the
observations, in seconds, at the field center.
Net_Counts
The Net Counts in the source detect cell.
Background_Counts
The estimated background counts in the detect cell.
SNR
The Signal-to-Noise Ratio (SNR) for the detection: only
sources with signal-to-noise values of 3.5 or greater were included in this
catalog.
Size_Corr
The Size Correction Factor. 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. It 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.
Rib_Edge_Code
The Ribs and Edges Code or RECO. This 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.
Off_Axis
The angular distance that the X-ray source is away from the
field center, in arcminutes.
Source_Flags
A set of source flags coded as follows:
A - additional detections of this source were achieved in other observations B - 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.
Reference_Flag
A reference and/or identification flag coded as follows:
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 Y Reference available, but no optical class + Generic indicator which means possible ID lies from 100-150 arcseconds from source location.