IV. 2MASS Data Processing
5. Extended Source Identification and Photometry
a. Algorithms, Analysis and Results
i. Examples of Radial Profile Fitting
Below are some examples of the radial profile fitting technique. The layout for all the image figures is as follows:
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Upper panel: J, H, Ks (Postage Stamp) images
Lower panel: Same, but with stars subtracted
The color code for the elliptical contours shown on the image figures is as follows:
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yellow = half-light ("effective") aperture
blue = 3-
aperturemagenta = 20 mag arcsec-2 aperture
orange = Kron aperture (2.5 * first moment diameter)
red = subtracted stars
The color code for the corresponding Ks-band surface brightness profiles is as follows:
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white points == mean surface brightness (log units)
green points == points used in the profile fit
red dashed line == solution
yellow line == half-light ("effective") radius
magenta line == 20 mag arcsec-2 radius
orange line == Kron radius (2.5 * first moment radius)
grey == integration radius for first moment determination
Object 1, J = 11.85, H = 11.32, Ks = 11.04 mag.
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| Figure 1 | Figure 2 |
Object 2, J = 11.47, H = 10.76, Ks = 10.42 mag.
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| Figure 3 | Figure 4 |
Object 3, J = 11.89, H = 11.16, Ks = 10.86 mag.
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| Figure 5 | Figure 6 |
Object 4, J = 12.51, H = 11.90, Ks = 11.58 mag.
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| Figure 7 | Figure 8 |
Object 5, J = 14.30, H = 13.51, Ks = 13.04 mag.
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| Figure 9 | Figure 10 |
Object 6, J = 14.46, H = 13.73, Ks = 13.44 mag.
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| Figure 11 | Figure 12 |
Object 7, J = 14.98, H = 14.14, Ks = 13.58 mag.
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| Figure 13 | Figure 14 |
[Last Updated: 2002 Jul 15; by Tom Jarrett]
Return to Section IV.5a.