EINSTEIN2E - Einstein Observatory 2E Catalog of IPC X-Ray Sources
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)>
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.
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.
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.
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.
The Galactic Longitude of the X-ray source.
The Galactic Latitude of the X-ray source.
The 2E Catalog Number representing a unique source: note that a single source may have more than one entry in this catalog.
The Einstein Sequence Number (ESN) of the IPC observation in which the source was detected.
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.
The positional error radius of the X-ray source, in arcseconds.
The corrected count rate, in counts per second.
The error in the count rate, in counts per second.
The live time (essentially the exposure time) of the observations, in seconds, at the field center.
The Net Counts in the source detect cell.
The estimated background counts in the detect cell.
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.
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.
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.
The angular distance that the X-ray source is away from the field center, in arcminutes.
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.
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.