FLIX

FLIX: Flux Limits from Images from XMM-Newton

FLIX is an upper limit server for XMM-Newton data, provided by the XMM-Newton Survey Science Centre (SSC).

If you provide a position of interest on the sky (or a text file with a list of positions) FLIX scans the public data products from XMM-Newton to determine whether each point was observed. If so FLIX:

Estimates an upper limit to the X-ray flux at that point in various energy bands,
Provides a crude estimate of the actual flux within a circle centred on that point,
Scans the 2XMMi catalogue listing any detections within 2 arc-minutes, and extracts a thumbnail X-ray image centred on the point.

Results are returned in the form of HTML tables and as a downloadable FITS file. For further information on input and outputs, see the online FLIX help file

Enter either: RA and DEC of point of interest For example: 12:34:56 -12:34:56 optional identifier
Or: Text file with one position per line:

Detection likelihood threshold for upper-limits (default 10.0 means ≈ 4-sigma, see help for more details)

Radius of circle [arcsec] for the flux estimation
For HTML output: select energy bands for upper-limits

0.2-0.5 keV 0.5-1.0 keV 1.0-2.0 keV 2.0-4.5 keV 4.5-12 keV

band 1 band 2 band 3 band 4 band 5

band 6 band 7

band 8

band 9

And select energy bands for encircled flux and error

0.2-0.5 keV 0.5-1.0 keV 1.0-2.0 keV 2.0-4.5 keV 4.5-12 keV

band 1 band 2 band 3 band 4 band 5

band 6 band 7

band 8

band 9

Thumbnail images: none 2 4 8 16 (arcmins)

Image overlays: none circle at specified position also 2XMMi sources and SRCID numbers

Show nearest field centre when position is not in field-of-view yes no

(Note: FLIX may take several seconds per source position, please be patient).

This version writes a row to the FITS file even if there are no data from XMM-Newton for the specified position, so that for a list of N positions, there will be at least N rows in the FITS file produced.

Important note: a bug in versions of FLIX before 2009 May 7th affected the FITS file output for positions where there was no identification in 2XMMi: the SRCID and SRCDIST values were incorrect, and in fact the same as in the preceding row. The HTML output was not affected. This bug has now been fixed, and SRCID will be zero and the SRCDIST null in such cases. My apology for not noticing this earlier. CGP

LEDAS Support

Version: 2009 June 15.