The latest version of the HEASARC X-ray data reduction/analysis software package HEASoft (version 5.3) is now available for download. HEASoft 5.3 contains FTOOLS 5.3, fv 4.0, XIMAGE 4.2, XRONOS 5.20 and XSPEC 11.3.
The BLASTA search engine, SIMBAD bibliography search and ViZieR gateway have been moved to a new server. The existing server ledas-svc will be retired shortly. Please update your bookmarks accordingly.
July 2003: AGASC available for download
The full AGASC (AXAF Guide and Acquisition Star Catalog) is now available for download from LEDAS via FTP. No portable catalog reading software is available, but the individual FITS files can be accessed with e.g. FTOOLS. CXC provides a search interface to the AGASC here.
June 2003: LEDAS Newsletter #17
June 2003: WebPIMMS upgraded to latest version v3.3
The X-ray mission simulator software WebPIMMS as been upgraded to the latest version v3.3, incorporating calibration data for Chandra Cycle-5 and XMM AO-3 proposals.
Users can now access the DSS image service directly, by submitting a URL of the form:-
where the parameters are as follows:-
LEDAS is now available at the new URL http://www.ledas.ac.uk/. The existing URL will continue to work, but we would advise users to update their bookmarks.
The latest version of the FITS access library CFITSIO (v2.460) is now available for download from LEDAS. This revision adds support for proxy HTTP servers when reading FITS files via HTTP. For more information, see the changelog.
The new LEDAS catalogue search interface ARNIE5 now supports interactive plotting and filtering of search results using VOPlot, a Java applet developed by Persistent Systems and the IUCAA. The applet is started by clicking on the 'Display in VOPlot' link in the ARNIE5 search results page. For more information, please see the VOPlot Help Page.
is the first comprehensive catalogue of serendipitous X-ray sources from the European
Space Agency's (ESA) XMM-Newton observatory, and has been constructed by the XMM-Newton
Survey Science Centre (SSC) on behalf of ESA. Most (> 80%) of the entries have
not previously been reported as
catalogue contains source detections drawn from 585 XMM-Newton EPIC observations
made between 2000 March 1 and 2002 May 5; all datasets were publicly available
by 2003 January 31 but not all public observations are included in this catalogue.
Net exposure times in these observations range
The processing to generate the catalogue is based closely on the data processing system used by the SSC in routine processing of XMM-Newton data on behalf of ESA to produce data products for observers and the archive. Considerable effort has been expended to 'calibrate' the catalogue in terms of understanding such issues as errors, biases, sensitivity and sky coverage.
The catalogue source detection and parametrisation technique is optimised for point-like sources, and has been performed across several photon-energy bands and using data from each of the three EPIC cameras - PN, MOS1, MOS2.
The catalogue content includes the source-detection parameters (likelihood, position coordinates, counts, count rate, flux, hardness ratio, background estimates, errors ...); the results of cross-correlation with a large number of archival catalogues (SIMBAD, NED, USNO, GSC, APM, ROSAT ...); quality 'flags' resulting from visual screening, and 'metadata' relating to the observation.
catalogue contains 33026 X-ray source detections with likelihood values >8
and summary quality flag >0, together with a further 23685 detections with
lower likelihood values and/or summary quality flag=0
The median flux (in the total photon energy band 0.2-12 keV) of the catalogue sources is ~3e-14 erg cm^-2 s^-1; ~12% have fluxes below 1e-14 erg cm^-2 s^-1.
The positional accuracy of the catalogue sources is generally ~0.5-2 arcsec (68% confidence radius) for detections with likelihood >8. The flux estimates from the three EPIC cameras are overall in agreement to ~2% for on-axis sources, and ~6% off-axis.
In association with the catalogue itself, various data products are also available (images, exposure maps, sensitivity maps, extracts from archival catalogues and databases ...).
a Web-based user interface allowing filtering and searching of the catalogue,
and links to associated data products from the XMM Science Archive at ESA Vilspa.
The latest version of the Chandra calibration database (CALDB 2.21) is now available for download from LEDAS. It includes a corrected version of the ACIS CTI-corrected response functions (CTI-corrected FEF version N0002), new CTI-corrected ACIS blank field (background) files, and -1 order HETG LSF parameter files.
The proposal planning tools for Cycle 5 are now available for download. The software includes a range of useful command-line tools for Chandra observations including the flux calculator PIMMS, and the observation visualiser (obsvis) to display instrument fields of view.