- ID:
- ivo://CDS.VizieR/IX/22
- Title:
- Einstein extended deep survey
- Short Name:
- IX/22
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Einstein Deep Survey program (EDS) consists of very deep X-ray exposures in selected regions of the sky at high galactic latitude. The main purposes of the survey are to investigate the nature of the extragalactic X-ray background through direct source counts at very low flux levels and to study the nature of the very faint X-ray sources which comprise a significant fraction, if not all, of the soft X-ray background. The survey includes 9 IPC observations and 34 HRI observations, which, in general, cover the central 32'x32' regions of the IPC fields. In total, 178 IPC sources and 202 HRI sources were detected above thresholds set to allow ~1 false source per observation. Data from all IPC energy bands and all HRI detect cells are included. The data are largely the result of standard Einstein Rev. 1 HRI and Rev. 1B IPC reprocessing; however, minor corrections to IPC count rates, fluxes, and flux significances have been made to account for different column densities toward various fields and small systematic errors in the IPC analysis of count rates and significances for long exposures. For further details please refer to the paper referenced above. The HRI field parameters have been determined from standard processing and from other information contained in the HRI .SDF file. For information on HRI sources, see the table "hsrc.dat"; for information on individual IPC fields, see the table "ifield.dat".
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- ID:
- ivo://nasa.heasarc/exss
- Title:
- Einstein Extended Source Survey
- Short Name:
- Einstein/Ext.
- Date:
- 27 Sep 2024
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The Einstein Extended Source Survey (EXSS) catalog contains a list of extended sources found in the Einstein Observatory Imaging Proportional Counter (IPC) Database. The source detection algorithm was substantially improved over that used for the Einstein Medium Sensitivity Survey (EMSS). Sources were searched for using circular apertures with variable radii of up to 6.1 arcminutes. Criteria were constructed so as to ascertain which of the detections were truly diffuse and which of the sizes best approximated each detection. Using these criteria, a catalog of 1325 extended source candidates at high galactic latitude (more than 20 degrees from the Galactic Equator) was produced. Cross-correlating this list with existing source catalogs yielded a reasonably comprehensive set of identifications for the sources in this list: over 400 were identified with known clusters of galaxies, while other objects were identified with galaxies, supernova remnants (SNR), active galactic nuclei (AGN), and stars. Whereas galaxies and SNR are often truly extended objects, AGN and stars can appear as extended ojects as a consequence of their soft X-ray spectra coupled with the broad point-spread function of the IPC at low energies. A total of 321 objects remain completely unidentified. Some of these may be heretofore uncatalogued clusters and groups of galaxies at moderate redshifts. The data used to construct this database table were obtained from the first author's Web site on 12 December 1997. This is a service provided by NASA HEASARC .
- ID:
- ivo://CDS.VizieR/IX/18
- Title:
- EINSTEIN extended source survey (EXSS)
- Short Name:
- IX/18
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalog contains sources from data collected by the IPC on board the EINSTEIN Observatory. This survey is designed to find extended sources and diffuse emission rather than point sources. In addition, the source detection algorithm is substantially improved over that used by EMSS. Sources were searched using circular apertures up to 6.1arcmin. The catalog contains 1326 extended source candidates at high galactic latitude (|b| > 20{deg}).
- ID:
- ivo://nasa.heasarc/fpcsfits
- Title:
- Einstein FPCS Events Files
- Short Name:
- FPCSFITS
- Date:
- 27 Sep 2024
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The FPCSFITS database is a listing of the Focal Plane Crystal Spectrometer photon event data. It was created in October 1992 and contains one entry for each of the 436 FPCS FITS files. This is a service provided by NASA HEASARC .
4105. Einstein HRI Images
- ID:
- ivo://nasa.heasarc/hriimage
- Title:
- Einstein HRI Images
- Short Name:
- HRIIMAGE
- Date:
- 27 Sep 2024
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The HRIIMAGE database table contains information from the High Resolution Imager aboard HEAO 2, the Einstein Observatory. Einstein incorporated a high-resolution X-ray telescope and a focal plane assembly capable of positioning at its focus one of four instruments: a high-resolution imaging detector (HRI), a broader-field imaging proportional counter (HRI), a solid state spectrometer (SSS), and a Bragg crystal spectrometer (FPCS). Einstein (HEAO 2) was launched on November 13, 1978, and operated successfully until April 1981. One duplicate entry was removed from the HEASARC implementation of this catalog in June 2019. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/hriphot
- Title:
- Einstein HRI Photon Event Data
- Short Name:
- HRIPHOT
- Date:
- 27 Sep 2024
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The HRIPHOT database contains information from the High Resolution Imager aboard HEAO-2, the Einstein Observatory, in Event List Format. Einstein incorporated a high-resolution X-ray telescope and a focal plane assembly capable of positioning at its focus one of four instruments: a high- resolution imaging detector (HRI), a broader-field imaging proportional counter (IPC), a solid state spectrometer (SSS), and a Bragg crystal spectrometer (FPCS). Einstein (HEAO-2) was launched on November 13, 1978, and operated successfully until April 1981. This is a service provided by NASA HEASARC .
- ID:
- ivo://CDS.VizieR/J/ApJ/511/65
- Title:
- Einstein images of galaxy clusters
- Short Name:
- J/ApJ/511/65
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the X-ray characteristics of a sample of 368 clusters of galaxies with redshifts less than 0.2 observed with the Einstein Imaging Proportional Counter. For each cluster, we measure the 0.5-4.5keV counting rate and compute the 0.5-4.5keV source luminosity, as well as the bolometric luminosity within fixed metric radii. We detect 85% of Abell clusters with z<0.1, demonstrating that the large majority of these optically selected clusters are not the results of chance superpositions. For 163 clusters, we measure their X-ray surface brightness profiles and determine their core radii. For {~}230 clusters, we then use either our measured core radii and values, or mean values derived for this sample, to measure central gas densities and gas masses. We use estimated or measured cluster gas temperatures, along with the derived gas-density profiles, to estimate total cluster masses, under the assumptions that the gas is isothermal and in hydrostatic equilibrium.
- ID:
- ivo://CDS.VizieR/J/AJ/115/2587
- Title:
- Einstein IPC database ultrasoft survey
- Short Name:
- J/AJ/115/2587
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- 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.
4109. Einstein IPC Images
- ID:
- ivo://nasa.heasarc/ipcimage
- Title:
- Einstein IPC Images
- Short Name:
- IPCIMAGE
- Date:
- 27 Sep 2024
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The IPCIMAGE database contains information from the Imaging Proportional Counter aboard HEAO 2, the Einstein Observatory. Einstein incorporated a high-resolution X-ray telescope and a focal plane assembly capable of positioning at its focus one of four instruments: a high-resolution imaging detector (HRI), a broader-field imaging proportional counter (IPC), a solid state spectrometer (SSS), and a Bragg crystal spectrometer (FPCS). Einstein (HEAO 2) was launched on November 13, 1978, and operated successfully until April 1981. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/ipcphot
- Title:
- Einstein IPC Photon Event Data
- Short Name:
- IPCPHOT
- Date:
- 27 Sep 2024
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The IPCPHOT database contains information from the Imaging Proportional Counter aboard HEAO-2, the Einstein Observatory, in Event List Format. Einstein incorporated a high-resolution X-ray telescope and a focal plane assembly capable of positioning at its focus one of four instruments: a high-resolution imaging detector (HRI), a broader-field imaging proportional counter (IPC), a solid state spectrometer (SSS), and a Bragg crystal spectrometer (FPCS). Einstein (HEAO-2) was launched on November 13, 1978, and operated successfully until April 1981. This is a service provided by NASA HEASARC .