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Task Outcome Summary

Abstract

We have constructed the 70micron (wide field) ICs obtained in PHOTOMETRY mode and SCAN modes. This report is the same for MIPS-918 (70micron PHOT IC) and MIPS-915 (70micron SCAN IC) as both modes are analyzed together. The standard deviations of the 70micron ICs over the entire array are approximately 22% (for both SCAN and PHOTOMETRY mode), but this statistics includes the illumination pattern of the 70micron array. If we remove the illumination pattern by ratioing two SCAN ICs, those of zodi_12a and zodi_12b that are nearby regions of the sky, we find that the rms is approximately 6%.

Analysis

In PHOTOMETRY mode we obtained a 9 point dither map (1 cycle) at 70microns with 3 second DCEs of a region of the sky (zodi_28a) chosen to avoid bright point sources. The offsets between positions are 300 arcseconds. At each position of the dither pattern there are 16 images (4 of which are stim flashes), so a total of 108 sky images were obtained to construct the 70micron Illumination Correction (IC). In SCAN mode we have observed 2 degrees (1 leg) in fast mode for three different regions of the sky (zodi_12a, zodi_12b, zodi_28a). Note that two of the 70micron SCAN regions were observed in MIPS-914 and MIPS-916. Since these tasks are repeated a number of times during IOC, we will observe different regions of the sky each time. The tasks will check for possible variations of quality of IC or saturation. This task will also be useful for screening regions of the sky to obtain ICs in SIRTF routine operations.

We used mips_sloper with sensitive cosmic ray detection (-q option) turning off the electronic non-linearity correction, mips_caler (using the 70micron dark me_70_darka_CamH_22oct2003.fits) and mips_enhancer with the following options:

mips_enhancer -OD -i listof70flats_phot.lst -SC 3 -C -dn -NI -FD -o ic70_phot_campaignI -r 1

Note that we rejected the first DCE after the stim flash (-r 1 option) and normalized the input images (-NI option).

The regions of the sky observed were:

zodi_12a (RA=7:3:28.1676 and Dec=27:40:3.6574, J2000) with a predicted brightness at 70microns of 14.7MJy/sr,
zodi_12b (RA=7:37:31.5146 and Dec=27:35:20.6376, J2000) with a predicted brightness at 70microns of 14.3MJy/sr, and
zodi_28a[315] (RA=21: 5: 7.4259 and Dec= -21:54: 4.3864, J2000) with a predicted brightness at 70microns of 13.9MJy/sr.

The predicted values of the 70micron brightness are from SPOT for the date of the observing (Oct 16, 2003).


Results

The PHOTOMETRY and SCAN mode 70micron ICs constructed using 108DCEs and 460DCEs respectively observed in Campaign I are shown in Figure1. Statistics on the images provides the following:

PHOT (108DCEs) zodi_28a: mean= 0.99559; median= 0.97453; sdtdev= 0.23729; skew=-0.16395
SCAN three reg (480DCEs): mean= 0.98979; median= 0.96911; sdtdev= 0.22919; skew= 0.21020
SCAN zodi12a (160DCEs): mean= 0.99196; median= 0.96456; sdtdev= 0.22789; skew= 0.19776
SCAN zodi12b (160DCEs): mean= 0.99212; median= 0.96713; sdtdev= 0.22940; skew= 0.20689
SCAN zodi28a (160DCEs): mean= 0.97618; median= 0.95515; sdtdev= 0.23807; skew= 0.25012

The histograms are shown in Figure2.


Figure1. Comparison of 70micron Illumination Corrections obtained in PHOTOMETRY and SCAN modes. Both are displayed from z1=0. to z2=2.



Figure2. Histogram of the 70micron Illumination Corrections observed in CampaignI obtained in different modes and different regions of the sky.


A better way to assess the quality of the observed ICs is to remove the illumination pattern of the 70micron array. To do so, we ratioed different 70micron IC. The statistics on the images provides the following:

ratio ICs PHOT(108DCEs)/SCAN(480DCEs): mean= 0.99291; median= 0.99687; sdtdev= 0.09522; skew=-0.34654;
ratio ICs PHOT(108DCEs)/PHOT(160DCEs): mean= 0.99395; median= 0.99388; sdtdev= 0.10441; skew=-0.16416;
ratio ICs SCAN zodi12a/zodi12b: mean= 0.99503; median= 0.99234; sdtdev= 0.06289; skew=-0.14379;
ratio ICs SCAN zodi12a/zodi28a: mean= 0.99770; median= 0.99788; sdtdev= 0.08530; skew=-0.10585;
ratio ICs SCAN zodi12b/zodi28a: mean= 1.0048; median= 1.00511; sdtdev= 0.08022; skew=-0.29291;

Some examples of the ratios of 70micron are shown in Figure3. The histograms of all the ratios of 70micron ICs are shown in Figure4. The statistics on the best case (that is, zodi_12a to zodi_12b which are nearby regions of the sky) provides 6%rms over the array.


Figure3. Examples of ratios of 70micron Illumination Corrections .



Figure4. Histograms of ratios of 70micron Illumination Corrections .

Conclusions

We have constructed 70micron ICs (wide field) obtained in PHOTOMETRY and SCAN modes using three regions of the sky (zodi_12a, zodi_12b, zodi_28a). The standard deviations of the 70micron ICs over the entire array are approximately 22%, but this statistics includes the illumination pattern of the 70micron array. If we remove the illumination pattern by ratioing two SCAN ICs, those of zodi_12a and zodi_12b that are nearby regions of the sky, we find that the rms is approximately 6%.

Output and Deliverable Products

70micron IC to be used to reduce data obtained in campaign I.

Actions Following Analysis