Task Outcome Summary

• DATA STATUS: Anomalous
  • The data have WCS issues identical to those seen in MIPS-100 - see that analysis write-up for details.
• TASK OUTCOME: Nominal

Abstract

Analysis

The data were analyzed in the same way that the routine standards are - see the MIPS-920 analysis for details.

Results

The standard measurements and some ancillary data are listed in Table 1. The observations in Table 1 are also plotted in Figure 1. The HD043107 observations suggest that the counts measured on a source are positively correlated with integration time. If this is the case for all targets, the two points above the curve in Figure 1 would move closer to the calibration line and the HD043107 would move further away.

Table 1: Standard Star Measurements
CAID	TARGET	F_24	ITIME	COUNTS	UNC	CAL	UNC	TYPE
		(Jy)	(s)			(DN/s/Jy)	(DN/s/Jy)
315E	HD028471	2.04e-2	10	2.819e3	7.653e1	1.59e5	4.31e3	G5V
315E	HD041371	9.64e-2	10	1.328e4	1.775e2	1.58e5	2.12e3	K0III
315E	HD042701	2.92e-1	3	3.804e4	5.866e2	1.50e5	2.31e3	K3III
315E	HD053501	1.23e+0	3	1.614e5	2.613e3	1.51e5	2.44e3	K3III
100D1	HD053501	1.23e+0	3	1.611e5	3.559e3	1.51e5	3.33e3	K3III
920D1	HD159330	5.40e-1	3	6.986e4	1.052e3	1.49e5	2.24e3	K2III
120E	HD159330	5.40e-1	3	6.974e4	1.028e3	1.49e5	2.19e3	K2III
320D1	HD043107	5.84e-2	3	7.162e3	1.749e2	1.41e5	3.44e3	B8V
320D1	HD043107	5.84e-2	10	7.237e3	2.248e2	1.43e5	4.43e3	B8V
320D1	HD043107	5.84e-2	30	7.642e3	1.499e2	1.50e5	2.95e3	B8V

Figure 1: Stellar calibrations plotted vs. the predicted flux density for each star. The weighted mean calibration is plotted as a horizontal line. Cool giants are plotted as circles, A stars as triangles, and solar analogs as squares. 3s integrations are in red, 10s in blue, and 30s in green.

Mosaic images of the 4 new calibrators (1 of them was observed in MIPS-320) are shown in Figures 2-5.

Figure 2: Mosaic of HD028471 images.

Figure 3: Mosaic of HD041371 images.

Figure 4: Mosaic of HD042701 images.

Figure 5: Mosaic of HD043107 images.

Conclusions

• Measurements of the same star with the same integration time are very repeatable - the symbols fall on top of each other in Figure 1
• The calibration appears to depend on integration time, with longer integrations providing more counts
• The four new stars analyzed in this writeup do not show any obvious defects which would make them poor standards

Output and Deliverable Products

none

Actions Following Analysis

• Determine why the calibration depends on integration time