The authors present 579 ISOPHOT observations (774 measurements) of 325 extragalactic objects. They were observed in mini-map mode with the C100/C200 detectors after revolution 95.

The data set consists on:

• AAP data structure files as produced by PIA 10.0 and the same in FITS format.
• A similar AAP structure (marked with "DC" in the filename) produced after applying a drift correction routine. Also available in FITS format.
• A postscript file which illustrates how the flux extraction was done.

A detailed report is available here.
Details of the data processing are described in Report I
 

List of caveats related to P22 mini-map observing mode corrected in this work:

• GENERAL CAVEATS FOR ISOPHOT
  • Signal Transients (ISOPHOT HB chapter 4.2.3 and OLP caveat 10.7)

    As described in the data processing report a flux dependent transient correction on all C100 data using an IDL routine is applied. For details of the algorithm see del Burgo et al. (ESA SP-511, 2002). The correction noticeably improved the results at intermediate fluxes (~ 2-16 Jy). In the case of the C200 detector signal transients are small and negligible compared to other error sources (P. Héraudeau, private communication).

  • Incomplete error propagation (ISOPHOT HB OLP caveat 10.3)

    Individual error bars for each measurement are obtained as the standard deviation of flux values obtained by different detector pixels. In parallel the empirical total uncertainty for the whole ensemble of 555 normal star measurements are also assessed by computing the standard deviation of the [measured - predicted] flux differences. The two kinds of errors were in reasonable agreement. The results confirmed that the main components of the total uncertainty are instrumental noise and sky confusion noise. In the case of C200 measurements the dominant factor is the sky confusion noise.

• CAVEATs for DETECTORS C100 and C200
  • Restricted signal non-linearity correction (ISOPHOT HB OLP caveat 10.10)

    As a last step of the processing scheme an empirical flux-dependent correction is performed which - signals and fluxes are approximately proportional - corrects to a large extent for the possible artifacts related to the restricted range of signal non-linearity correction (for all C100 & C200 filters but C70 the lower boundary of the signal linearization table was 0.0 and any artifacts are expected at very high fluxes).

  • Responsivity Drifts (ISOPHOT HB chapter 4.2.4 and OLP caveat 10.8):

    As described in the data processing report in those cases when enough data points were available the long term drift evolution was fitted with a 2nd order polynomial and subtracted from the observation. This correction improved the photometric results significantly.

  • Background Subtraction

    In a mini-map observation several raster steps observed the sky background. As part of the processing scheme the background level was computed and subtracted from the source measurement.