Task Outcome Summary

• DATA STATUS: Anomalous
• TASK OUTCOME: Nominal

Abstract

Analysis

Raw data file: mips_AOR_7196416_sed_A70_Pukn_pos1_3s.fits = IC443

Raw data file: mips__7195648_sed_A70_Pukn_pos1_0s.fits = 30 Dor

Raw data file: mips__7196160_sed_A70_Pukn_pos1_0s.fits = NGC7009

Note: The observations of NGC6826 and NGC7009 failed because errors in the location of the slit in the focal plane led to slit being positioned off of these targets. IC443 and 30 Dor are large enough that the pointing error still led to portions of these nebulae being included in the SED slit.

Reduction:

mips_sloper -j CamK -l -q TARGET.raw.fits

mips_caler -C CamK -P mips_caler70S.param TARGET.red.fits

IDL> Iraf_Legacy,'TARGET.cal.fits',RepVal=-9999,/nomask

Within IRAF: imcombine was used to find medians of the various spacecraft/scan mirror positions used in each AOR. No sky subtraction was performed as the nebulae were large enough to be included in the "sky" chops 3 arcmin from the target positions.

For IC443, the median of 6 DCEs from one spaceraft/scan mirror position that showed the best evidence for the [O I] 63µm was constructed (shown below). The line could not be identified on the B side of the array. A median was then constructed from columns 2-12 of side A of the array. From this, the position of the [O I] 63µm was measured.

30 Dor was observed in all pointings and scan mirror chops employed in the AOR. The nebula was much brighter in the "on" mirror positions than in the "sky" positions. The AOR for this target employed a 4-position SED "map" and the brightest section of the nebula can be seen stepped along the length of the slit. A median of the DCEs for each position of the map was made and then the four frames were added together. The resulting image, shown below, allows for the 88µm [O III] emission line to be traced for the entire length of the slit and it can be identified even on side B of the 70µm array (columns 17-24).

The measured position of the [O III] 88µm is 21.64 pixels from the blue end in a one-dimensional spectrum of 30 Dor made from a median of columns 2-12 on the array (to be consistent with the measurement of [O I] from IC443).

These measurements yield the following parameters for the SED mode:

• Dispersion: 1.71 µm/pixel
• Blue edge (blue edge of pixel 1 along the dispersion axis) of the spectrum (at pixel 7 along the spatial axis): 51.3 µm
• Red edge (red edge of pixel 32 along the dispersion axis) of the spectrum (at pixel 7 along the spatial axis): 106.1 µm

The position of the 88µm line was measured along the slit in the spatial direction for 30 Dor. It is found that the line center shifts by at most 1 pixel in the dispersion direction from one end of the slit to the other. The table below shows measurements of the line at 4 positions along the slit. Each position is a median of 6 columns on the array.

Columns medianed	Position along slit	Position of emission line
	(X; in pixels)	(X; in pixels)
1-6	3.5	21.23
7-12	9.5	21.66
13-18	15.5	21.77
19-24	21.5	21.82

These data indicate that there is roughly a 0.75 pixel (1.28 µm) difference in the line position on the array between one end of the slit and the other. However, the formal uncertainties in the linear fit are consistent with no line shift along the slit in the spatial direction.

Output and Deliverable Products

Actions Following Analysis