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Task Outcome Summary

Abstract

This task uses a standard photometry AOT at 24µm to observe a red, non-variable AGN with no PAH features observed previously with ISO SWS. The target will be Mrk 279, which is also being observed by IRS in their IOC task 191.

Neglecting color corrections, the 24um flux density is 0.341 Jy +/- 0.005 Jy.


Analysis

The raw data was processed through the DAT version 2.41 to produce 30 calibrated DCEs. These were loaded into IDP3, where aperture photometry was performed using the adopted standard apertures (see MIPS 920) and an aperture correction AC = 1.146. The photometric difference between the top and bottom positions that has been seen in all the calibrator data was also seen here.

Results

The target was observed successfully, producing the expected 30 DCE's. Automated photometry was performed with IDP3. This process uses the WCS to initially place the apertures and then does a gaussian fit at each position before performing the aperture photometry. The results are listed in Table 1 and Figure 1 below.

Table 1: Aperture photometry for Mrk 279.

XCenter YCenter DN/s BMedian BRMS
38.6381 32.7087 44877 374.5 14.31
38.3524 84.6658 43875 376.7 15.52
38.613 37.3434 44627 379.6 14.65
38.3491 89.2209 43752 380.6 16.85
38.6121 41.9936 44889 379 16.62
38.333 93.7573 44601 381.4 16.05
38.4206 80.0368 43859 380.4 34.71
38.6676 32.6626 44885 380.9 14.02
38.4027 84.6421 44082 381.5 15.57
38.6262 37.3238 45042 380.7 14.77
38.3223 89.2368 43726 381.4 17.1
38.5729 42.0173 44925 379.1 17.05
38.313 93.7808 44493 381.3 15.19
38.3959 80.0618 43914 381.4 18.55
89.5631 32.6269 45524 376.7 14.58
88.6009 84.7343 44451 377.3 16.69
89.4914 37.2853 46079 380.2 13.83
88.5213 89.3136 44220 378.6 16.49
89.4289 41.967 45526 381.2 16.31
88.4428 93.877 43886 380.7 46.76
88.718 80.1323 44746 379.1 20.35
89.5878 32.6448 45713 381 13.7
88.6293 84.7639 43970 380.7 19.27
89.5176 37.3202 45635 382 14.4
88.5362 89.3303 43990 380.6 35.24
89.4353 41.9851 45331 380.8 16.32
88.4352 93.8888 43948 381.3 18.31
88.7102 80.1425 44755 378.8 20.05

Average Object = 44619 +/- 680 DN/s (1.5%)

Average Background = 380 +/- 1.8 DN/s (0.5%)

Figure 1: Photometric data as a function of DCE for Mrk 279. No aperture correction has been applied. The white circles indicate the boost frames. These were not used in the analysis.

 

Figure 4: Median background measurements in the sky annulus as a function of DCE.

The individual DCEs were aligned using the gaussian centroids, then median combined to for the final mosaic'd image shown in Figure 3 (note that the image has been rotated so that N is Up, East is to the Left). The DSS image is shown in Figure 4.

 

Figure 3: 24um mosaic image of Mrk 279.

Figure 4: DSS image of Mrk 279.

The derived flux density for Mrk 279 is consistent with the IRAS upper limit of 0.33 Jy at 25um. The SED obtained from NED is shown below with the 24um MIPS point. A single power-law fitted through all of the NED data is also shown for comparison.

 

Conclusions

The flux density for the MIPS-IRS red cross calibrator Mrk 279 have been obtained, reduced and analyzed successfully. While we do not have a direct comparison with other far-IR missions, the flux density measured by MIPS is consistent with the IRAS upper limits and with the overall power-law SED.

Output and Deliverable Products

Flux density in the 24um band.

Actions Following Analysis

The flux densities still need to be adjusted for the color correction. The flux densities must be transmitted to the IRS team.