The ROSAT Results Archive
Catalog of High Resolution Imager Detections
The ROSAT Consortium (the Max-Planck-Institut für extraterrestrische Physik, the Goddard Space Flight Center, the Smithsonian Astrophysical Observatory, Leicester University, and the Astrophysikalisches Institut Potsdam) announces an update to "THE ROSAT SOURCE CATALOG OF POINTED OBSERVATIONS WITH THE HIGH RESOLUTION IMAGER" (ROSHRICAT). This updated catalog (version of August 1999) contains arcsecond positions and count rates of detected sources from nearly 3000 public ROSAT HRI observations, including more than 7500 firm sources (signal-to-noise ratio > 4).
The catalog consists of all primary source parameters from the automated detection algorithm employed by the Standard Analysis Software System (SASS). In addition each observation has been quality checked, both by automatic algorithms and by detailed visual inspection. The results of this quality checking are contained as a set of logical-value flags for each principal source parameter. If a source parameter is suspect, the associated flag is set to "TRUE"; parameters with no obvious problems maintain the default, "FALSE", value. In addition to the catalog, data products for each screened observation are also available. These data products include the screened source lists, FITS images, and ASCII files containing information about obvious real sources not detected by the SASS detection algorithms.
Below we describe the Sequence and Source flags which are currently defined:
Sequence flags: =============== FLAG NAME "True" condition --------- ---------------- ASP_SUSP obvious aspect problems (sources appear multiple or have obvious ellipticity) EXT_EMIS presence of extended emission over most of the field FIELD_FDET one or more detected sources deemed false DEFERRED data screening not done MISS_SRC one or more obvious sources not detected by SASS BKG_SUSP Field background may be incorrect (due to inclusion of high background intervals or extended emission) SLIS_MIS source list is missing (no sources detected by SASS or source detection stopped) Source Flags: ============= FLAG NAME "True" condition ---------- ---------------- CONFUSED close sources confused detection algorithm DET_STRUCT source near detector structure EXTENDED source is probably resolved FALSE_DET detection judged to be spurious INTEN_SUSP source brightness suspect MULT_DET complex emission split into individual sources NOT_CHECKED source not checked POS_SUSP source position suspect ASSOCIATED another source nearby may influence derived source quantities VARFLG_SUSP SASS variability flag suspect WITHIN_EXT source within extended emission UN_UNIQUE source matched with another source which was identified in a smaller detect cell (HRI only)The ROSAT High Resolution Imager Source Catalog will continue to be updated as new HRI observations are screened and become public. New versions will be announced via the electronic ROSAT Status reports and on the RRA web sites at MPE, GSFC, SAO, AIP and Leicester.
Access to the Catalog
The ROSHRI catalog is installed as a one of the standard ROSAT catalogs in the Browse archive interface. To access the ROSHRI catalog, select ROSAT from the list of missions and select the "Advanced Query", then select ROSHRI from the list of catalogs. You can then start a query right away by entering a source name or position and clicking "Start Query". If you want to set other parameters besides position, click 'Parameter Query' and you will be given a form where you can change the parameter defaults.
To easily search ROSHRI on source coordinates or source names with un-unique, false, and not-checked sources excluded, users can access the ROSHRI Browse interface directly.
- The MPE ROSAT SOURCE BROWSER
Users can also query the ROSHRI using the ROSAT SOURCE BROWSER developed by MPE at http://www.xray.mpe.mpg.de/cgi-bin/rosat/src-browser
The ROSHRI catalog is also accessible via the Leicester Archive Network Interface, or ARNIE, at http://ledas-www.star.le.ac.uk/arnieV4/
FTP AccessUsers can also access an ASCII listing of all the parameters for all the sources in the ROSHRI catalog. This listing is availabele (in gzipped form) via anonymous ftp:
% ftp legacy.gsfc.nasa.gov username: anonymous password: you@your-email-address ftp> cd /rosat/doc/archive/RRA/hri/1rxh ftp> binary ftp> hash ftp> get roshricat.txt.gz ftp> get roshricat-short.txt.gz ftp> quit % gunzip roshricat.txt.gz % gunzip roshricat-short.txt.gzThe roshricat.txt file contains the full source list ; the roshricat-short.txt file is a version of the source list in which deferred fields, un-unique sources, sources with s/n < 4 and sources flagged as "false" have been excluded.
Data products associated with each screened ROSHRI sequence can be obtained via anonymous ftp at ftp://legacy.gsfc.nasa.gov/rosat/data/hri/RRA/; for example ftp://legacy.gsfc.nasa.gov/rosat/data/hri/RRA/200000/rh201848n00/
Other RRA Sites
Page Author: Michael F. Corcoran
Last modified August 18, 1999