« Previous |
1 - 10 of 18
|
Next »
Number of results to display per page
Search Results
2. EXMS catalog
- ID:
- ivo://CDS.VizieR/J/A+AS/134/287
- Title:
- EXMS catalog
- Short Name:
- J/A+AS/134/287
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalog of X-ray sources observed during slew maneuvers by the Medium Energy Detector Array onboard the EXOSAT Observatory. The EXOSAT Medium Energy slew-survey catalog (EXMS) provides a unique record of the 1-8keV X-ray sky between 1983 and 1986. 98% of the sky was observed, with 85% receiving an exposure of >60s. 1210 sources were detected. By comparing these source positions with other catalogs, identifications are given for 992 detections (82% of the sample). These identifications consist of 250 distinct objects, including 95 different X-ray binary systems, and 14 different AGN. A further 58 detections have multiple candidates, while 160 detections remain unidentified. Collimator transmission corrected 1-8keV count rates are given for the identified sources, together with raw count rates for the other detections. The construction of the EXMS and the checks performed to ensure the validity of the derived source properties are discussed. A publically available version of this catalog is maintained on the EXOSAT database and archive system (telnet://xrayxosat.estec.esa.nl).
- ID:
- ivo://nasa.heasarc/exopubs
- Title:
- EXOSAT Bibliography
- Short Name:
- EXOPUBS
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- This database table contains information about all EXOSAT publications in refereed journals that make use of EXOSAT data. Each entry is unique for every combination of publication and X-ray source. For example, a paper which discusses five X-ray sources will have generated five distinct entries in the database, each referring to a different X-ray source. Unlike EXOLOG, the EXOPUBS database also includes entries for serendipitous sources. In addition to standard database parameters such as source name, coordinates, object class, etc., the EXOPUBS includes the full reference (authors, journal, volume, page, year) and title of each publication. Note the information is not complete after the year 1991. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/exohgls
- Title:
- EXOSAT/CMA High Galactic Latitude Survey
- Short Name:
- EXOSAT/High
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- A survey of serendipitous source performed in the very soft X-ray band (0.05-2.0 keV) using the EXOSAT imaging telescopes is presented. The survey covers 783 square degrees of high galactic latitude sky and includes 210 serendipitous sources which define a complete (flux-limited) sample. An extensive program of optical and radio observatories together with cross-correlations with catalogs of known objects lead to the identification of 200 of the 210 detected sources. The 10 remaining objects have been preliminarily classified on the basis of their X-ray to optical flux ratios, thus making the sample essentially fully identified. Twenty-three additional serendipitous sources which did not satisfy the requirements for inclusion in the complete sample were also identified during the optical observations program. The complete sample has been used to study the logN-logS relation and the average spectral slope of AGN. It is found that the logN-logS slope is consistent with that of the Einstein Extended Medium Sensitivity Survey (EMSS) and with the "Euclidean" value of 1.5. The normalization of the logN-logS is a strong function of the assumed spectral slope of AGN. Consistency with the results of the EMSS implies that the average (energy) slope of extragalactic sources in the soft X-ray band is very steep (alpha ~ 1.5). An analysis of the association between AGN detection and Galactic NH also shows that alpha is steep and inconsistent with the canonical value of 0.7. The survey was particularly successful in detecting nearby Galactic soft X-ray emitters and includes a significantly higher percentage of stars than the Einstein EMSS, five White Dwarfs, and three previously unknown AM Her type systems. The sample of sources in this catalog has been selected from the CMA database, which it has been generated using a standard processing on the LE data. The source detection algorithm used a sliding cell method. The size of the search cell is such as to maximize the sensitivity across the field of view. For more information about the LE processing see the documentation in the CMA database. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/cmaimage
- Title:
- EXOSAT CMA Images for Each Pointing
- Short Name:
- CMAIMAGE
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- This database table contains the images from two EXOSAT LE telescopes with the channel multiplier array (CMA) detectors in the focal plane. The CMA/telescope combination covers the 0.05-2.5 keV energy range with a field of view of 2 degrees and an on-axis angular resolution of 24 arc seconds (HEW). The detectors had no intrinsic spectral capabilities; however, different filters were used to make broad band measurements. The most commonly used were Thin Lexan (number 7), Aluminum-Parylene (number 6) and Boron (number 8). An image was generated for each filter used during an observation. This Browse table was created in March 1995 and updated in October 2003. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/cmascreen
- Title:
- EXOSAT/CMA Sources (Screened for Quality)
- Short Name:
- CMASCREEN
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- This database table contains the results of the sources detected from the two EXOSAT LE telescopes. Each telescope had a channel multiplier array, CMA, detector in the focal plane. The CMA/telescope combination covered the 0.05-2.0 keV energy range with a field of view of 2 degrees and an on-axis angular resolution of 20 arcseconds (HEW). The detectors had no intrinsic spectral capabilities; however, different filters were used to make broad band measurements. The most commonly used were thin Lexan (no. 7), Aluminum-Parylene (no. 6) and Boron (no. 8). An image was generated for each observation using a particular filter. A detection program was used to generate one database entry per source detected above a particular threshold. This catalog contains the list of detected sources, details about those detections, plus the names of the files containing the associated image and lightcurves. Since many objects were observed many times, there are multiple entries per object. The list of detections in this database table has been screened for quality. Only sources with qflag_le >= 3 are present. Please refer to the <a href="/W3Browse/exosat/cma.html">CMA</a> database table for the complete, unscreened list of detections. This database table was created by the HEASARC in August 2020, and it is based on a table created by the HEASARC in 1995 or earlier. The original CMA database table was created at the EXOSAT observatory during the post-operation phase (1986-1990) as part of the pipeline processing. These CMA results are part of the HEASARC data holdings from the start of the HEASARC. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/cma
- Title:
- EXOSAT/CMA Sources (Unscreened)
- Short Name:
- CMA
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- This database table contains the results of the sources detected from the two EXOSAT LE telescopes. Each telescope had a channel multiplier array, CMA, detector in the focal plane. The CMA/telescope combination covered the 0.05-2.0 keV energy range with a field of view of 2 degrees and an on-axis angular resolution of 20 arcseconds (HEW). The detectors had no intrinsic spectral capabilities; however, different filters were used to make broad band measurements. The most commonly used were thin Lexan (no. 7), Aluminum-Parylene (no. 6) and Boron (no. 8). An image was generated for each observation using a particular filter. A detection program was used to generate one database entry per source detected above a particular threshold. This catalog contains the list of detected sources, details about those detections, plus the names of the files containing the associated image and lightcurves. Since many objects were observed many times, there are multiple entries per object. This database table contains the complete list of detections and has not been screened for quality. Please refer to the <a href="/W3Browse/exosat/cmascreen.html">CMASCREEN</a> database table for a version which has been screened for quality. This database table was created by the HEASARC in August 2020, and it is based on a table created by the HEASARC in 1995 or earlier. The original CMA database table was created at the EXOSAT observatory during the post-operation phase (1986-1990) as part of the pipeline processing. These CMA results are part of the HEASARC data holdings from the start of the HEASARC. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/exofot
- Title:
- EXOSAT Final Observation Tapes
- Short Name:
- EXOFOT
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The EXOFOT database table contains the log of the EXOSAT final observation tapes (FOTs). It is meant to help locate the desired EXOSAT data file within the HEASARC data archive. The table itself contains a minimal number of parameters regarding the observation. This information corresponds to the first 255 bytes which label the FOT. Those parameters are target name, experiment, and start and stop time. The other parameters in the table are more related to the organization of the archive. This is a service provided by NASA HEASARC .
- ID:
- ivo://CDS.VizieR/J/A+AS/109/9
- Title:
- EXOSAT GSPC iron line catalog
- Short Name:
- J/A+AS/109/9
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- (no description available)
- ID:
- ivo://nasa.heasarc/gs
- Title:
- EXOSAT GSPC Spectra and Lightcurves
- Short Name:
- GS
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The results and data products from the EXOSAT GSPC. Only sources with ME count rates of at least 5 ct/s/half are included. This is a service provided by NASA HEASARC .
