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ngc7814-halo2a

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Below are comparison images for ngc7814-halo2a. Hold your mouse over one of the three segments of each dial (or the mask button) to see the image. Clicking on the segment will download the source image as a 4200x4200 jpeg. The artificial star test completness (Comp.) indicates the percentage of artificially generated stars recoverd given the selection culls of the pipeline. The F606W offset indicates the difference between the artificial star's F606W input magnitude and that subsequently measured by the pipeline. CMDs and diagnostic plots can be found further down the page.

Filters:

filters colour F606W F814W

Stars:

stars All Stars Non RGB Stars RGB Stars











Artificial Star Tests:

stars Observation Recovered F606W Magnitude Offset Completeness
galaxy
Below is the CMD for the ngc7814-halo2a stars colored above.
CMD TRGB
The TRGB is found at F814W = 26.9 mag and I = 27.0, corresponding to a distance modulus of 30.94 (15.42 Mpc). The (V-I ) color of the RGB at MI = -3.5 is 1.4, corresponding to a metallicity of [Fe/H] = -1.4.
Below are the diagnostic plots for the photometry output. Color indicates the cuts used.
Sharpness
Sharpness
Roundness
Roundness
Crowding
Crowding
Chi
Chi
Aperture Corrections
The aperture corrections plotted above are the average of those shown below. The red line indicates the best fit to the aperture corrections of the entire GHOSTS survey.
Aperture Corrections
Below are the results of the artifical star tests. Completeness indicates the fraction of artificial stars that were succesfully recovered given the selection cuts used in the pipeline.
Completeness Tests
The plots below show a representative sample of the full artificial star tests.
Recovered F606W Magnitude
Recovered F814W Magnitude
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