Other
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998sao..reptq....w&link_type=abstract
Technical Report, NASA/CR-97-207603; NAS 1.26:207603
Other
Data Processing, Quasars, Calibrating, Target Recognition, Space Observations (From Earth), Exposure, Fitting, Vignetting, Astronomical Models, Radiation Counters
Scientific paper
The PIA (PHOT Interactive Analysis) software was upgraded as new releases were made available by VILSPA. We have continued to analyze our data but, given the large number of still outstanding problems with the calibration and analysis (listed below), we remain unable to move forward on our scientific program. We have concentrated on observations with long (256 sec) exposure times to avoid the most extreme detector responsivity drift problems which occur with a change in observed flux level, ie. as one begins to observe a new target. There remain a significant number of problems with analyzing these data including: (1) the default calibration source (FCS) observations early in the mission were too short and affected by strong detector responsivity drifts; (2) the calibration of the FCS sources is not yet well-understood, particularly for chopped observations (which includes most of ours); (3) the detector responsivity drift is not well-understood and models are only now becoming available for fitting chopped data; (4) charged particle hits on the detector cause transient responsivity drifts which need to be corrected; (5) the "flat-field" calibration of the long-wavelength (array) detectors: C1OO, C200 leaves significant residual structure and so needs to be improved;(6) the vignetting correction, which affects detected flux levels in the array detectors, is not yet available; (7) the intra-filter calibrations are not yet available; and (8) the background above 60 microns has a significant gradient which results in spurious positive and negative "detections" in chopped observations. ISO Observation planning, conferences and talks, ground based observing and other grant related activities are also briefly discussed.
No associations
LandOfFree
ISO Key Project: Exploring the full range of QUASAR/AGN properties does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ISO Key Project: Exploring the full range of QUASAR/AGN properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ISO Key Project: Exploring the full range of QUASAR/AGN properties will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1648225