MOPEX User's Guide - IRSA

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MOPEX User’s Guide The central PRF is that corresponding to a center-of-pixel hit. The pixel noise should be from Gaussnoise, which produces images called, e.g. coadd_Tile_*_Image_noise.fits. Defining the factor, NP, as the ratio of the total central PRF volume to that under the peak pixel, the SNR is the extracted flux Fps for a point source divided by the scaled noise σ(xps,yps), at the peak pixel (xps,yps): SNR ps = F ps σ(x ps,y ps)⋅ NP Equation 8.29 This calculation assumes only one PRF, the central one. It becomes poor when the pixels are large relative to the PRF width (e.g. IRAC channels 1 and 2 data), and generally gives an uncertainty estimate that is too low. It does not take into account the positional uncertainty. However, it is reasonable in background-limited, well-sampled cases. 1. Photerr, no gain: Simulations of Spitzer data have shown that a better estimate of the SNR is obtained by summing the data uncertainties within a box roughly the size of the core of the PRF. The box extends out to about 10% of the peak and was estimated from the simulations; no subpixel summing is done. For this option, the data uncertainties are used. The data uncertainties include the photon noise from the source itself, so this method is more general than the previous estimate, based solely upon the background. This is usually the best option. 2. Photerr, with gain: If the data uncertaintes are unavailable, or unreliable, then the source photon noise can be put in explicitly. This option brings APEX in line with noise estimates from other standard software (e.g. SExtractor; Bertin & Arnouts 1996). In the case with gain, the noise for the SNR is: σ 2 2 = ∑ σ i + F /g i Equation 8.30 where σi are the pixel uncertainties in the same box described above, F is the source flux in data units, and g is the gain (electrons per data unit). The final noise is converted to flux units. The input σi in this case should be the estimates obtained from the Gaussnoise module. The gain to use is the gain for a single image. It will take into account the coverage to estimate an effective gain. In the case of integration-time weighting, it should be for unit time. Basic Concepts in MOPEX 218 Uncert ainty Est imat ion
8.9.3 Aperture Uncertainties MOPEX User’s Guide Aperture uncertainties are calculated in the Aperture module. It uses the data uncertainties (or "ga in-estimated" ones, if enabled). The aperture flux uncertainty is a sum over the aperture area: σ 2 = (σ(i) 2 ∑ ) Equation 8.31 The sum takes into account fractional pixels. If any have bad uncertainties, ap_unc is set to -9.99. Uncertainty in the background subtraction is not included. The results are written out in the aperture.tbl and extract_raw.tbl as "ap_unc1", "ap_unc2", etc. The APEX module, Select, can select on them when creating the final extract.tbl. Uncertainties will only be calculated if the uncertainty file is found, and is the right size. If not found, or not the right size, Aperture Photometry will proceed but set the aperture uncertainties to -9.99. It is possible to run Aperture Photometry by itself on an extract list, but if the extract list already contains aperture columns, then Aperture Photometry will append new columns. 8.10 The User List Input Table When running APEX User List and APEX User List Single Frame, the user is required to enter a table listing the point sources that APEX should extract. This replaces the running of the Detect module. For more information on APEX User List, see Chapter 6. This table is given in the APEX User List Settings module as User Input Fixed Positions Table File Name, or in the command-line namelist as INPUT_USER_LIST. There are several ways to create this table: 1. Provide a text file with a list of RA and Dec coordinates, with exactly the following format: |RA |Dec | |double |double | 274.072341 -2.544706 274.072895 -2.531989 Basic Concepts in MOPEX 219 The User List Input Table
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MOPEX User’s Guide MOsaicking and
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MOPEX User’s Guide Chapter 4. Ove
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MOPEX User’s Guide 7.4 PRF Estima
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Chapter 1. Introduction MOPEX User
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MOPEX User’s Guide • If you are
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for Linux and Solaris systems, and:
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Chapter 2. Overview of MOPEX MOPEX
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For instructions on how to run MOPE
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2.3.1 Additional Functionality MOPE
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MOPEX User’s Guide mosaic_mask.pl
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MOPEX User’s Guide Choosing the r
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MOPEX User’s Guide photometry), o
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Chapter 3. MOPEX Input MOPEX User
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3.2 MOPEX Input List Files MOPEX Us
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Chapter 4. Overlap (overlap.pl) MOP
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MOPEX User’s Guide 3. Background
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MOPEX User’s Guide Output Directo
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ncpu_multiprocess = 1 default = 1 I
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4.3.3 Overlap Modules: S/N Estimato
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σ = σ 2 readnoise g 2 + σ 2 conf
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MOPEX User’s Guide Generated Head
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OUTPUT MOPEX User’s Guide Generat
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OUTPUT MOPEX User’s Guide Generat
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MOPEX User’s Guide When choosing
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MOPEX User’s Guide offsets and th
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Chapter 5. Mosaicking (mosaic.pl) M
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MOPEX User’s Guide They do not ne
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MOPEX User’s Guide more informati
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MOPEX User’s Guide Pixel by Size:
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OUTPUT None DISCUSSION MOPEX User
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MOPEX User’s Guide This module al
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MOPEX User’s Guide negative numbe
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DISCUSSION MOPEX User’s Guide For
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MOPEX User’s Guide This module pe
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DISCUSSION MOPEX User’s Guide Mos
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DISCUSSION No further information.
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MOPEX User’s Guide processed in o
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MOPEX User’s Guide Min Pix Number
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MOPEX User’s Guide Box Median Bia
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MOPEX User’s Guide If coverage >=
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MOPEX User’s Guide Refine Outlier
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PURPOSE MOPEX User’s Guide The in
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MOPEX User’s Guide The tile speci
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MOPEX User’s Guide Standard Devia
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Mosaic Coverage File (mosaic_cov.fi
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There are no user-defined input par
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COMMAND LINE INPUT See INPUT. OUTPU
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MOPEX User’s Guide limitations di
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6.3 Running APEX MOPEX User’s Gui
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MOPEX User’s Guide Point Source D
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Figure 6.1: Overview of the main pr
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Relevant Pipelines: All PURPOSE INP
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NICE = 1 save_namelist = 1 MOPEX Us
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MOPEX User’s Guide Mosaic PRF Fil
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create_unc_mosaic = 1 use_std_to_de
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MOPEX User’s Guide Use Refined Po
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MOPEX User’s Guide Here FLUXCONV
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MOPEX User’s Guide This module cr
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MOPEX User’s Guide year) and with
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MOPEX User’s Guide Mosaic FIF Tab
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MOPEX User’s Guide Tile BCD file
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MOPEX User’s Guide Window X, Y: (
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MOPEX User’s Guide neighboring pi
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⎛ ⎜ ⎜ P( j) = ⎜ 1+ ⎜ ⎜
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&END MOPEX User’s Guide if use_ps
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MOPEX User’s Guide \float Tile_Of
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MOPEX User’s Guide Input Type: De
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MOPEX User’s Guide pixels set to
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MOPEX User’s Guide This module co
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MOPEX User’s Guide is recorded as
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&END OUTPUT MOPEX User’s Guide Th
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INPUT Columns selection: MOPEX User
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PURPOSE MOPEX User’s Guide Fits t
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MOPEX User’s Guide given below. O
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6.5.19 APEX Modules: Aperture Photo
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Condition Builder: Some simple sele
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MOPEX User’s Guide Fatal Mask Bit
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MOPEX User’s Guide Pixel by Size:
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MOPEX User’s Guide Mosaic PRF Fil
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PRF_ResampleX_Factor = 100, PRF_Res
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7.3 Running PRF Estimate MOPEX User
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MOPEX User's Guide - IRSA

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