Changeset 39852
- Timestamp:
- Dec 13, 2016, 2:21:08 PM (10 years ago)
- Location:
- trunk/doc/release.2015/ps1.detrend
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- 1 added
- 1 edited
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detrend.tex (modified) (14 diffs)
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lib.bib (added)
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trunk/doc/release.2015/ps1.detrend/detrend.tex
r39850 r39852 9 9 %\documentclass[preprint2]{aastex} 10 10 %\documentclass[preprint2,longabstract]{aastex} 11 11 12 \RequirePackage{color} 12 13 \input{astro.sty} 13 14 %\usepackage{subcaption} 15 %\usepackage{natbib} 16 %\bibliographystyle{apj} 17 %\bibliographystyle{plain} 14 18 15 19 % online version may use color, but print version needs b/w … … 135 139 reduction of the Pan-STARRS archival data. The first two reductions 136 140 were used internally for pipeline optimization and the development of 137 the initial photometric and astrometric reference catalog \citep{ ps1_reference_catalog}. The141 the initial photometric and astrometric reference catalog \citep{magnier2017c}. The 138 142 products from these reductions were not publicly released, but have 139 143 been used to produce a wide range of scientific papers from the … … 151 155 152 156 The Pan-STARRS image processing pipeline (IPP) is described elsewhere 153 \citep{ MagnierKaiserChambers2006}, but a short summary follows. The157 \citep{magnier2017a}, but a short summary follows. The 154 158 archive of raw exposures is stored on disk, with a database storing 155 159 the metadata of exposure parameters. For the PV3 processing, large … … 158 162 This stage performs the image detrending (described below in section 159 163 \ref{sec:detrending}), as well as the single epoch photometry 160 \citep{ MagnierXXY}, in parallel on the individual OTA device data.164 \citep{magnier2017b}, in parallel on the individual OTA device data. 161 165 Following the \ippstage{chip} stage is the \ippstage{camera} stage, in 162 166 which the astrometry and photometry for the entire exposure is … … 184 188 objects detected in that to perform forced photometry on the 185 189 individual \ippstage{warp} stage images. The details of these stages 186 are provided in \citet{ MagnierXXY}.190 are provided in \citet{magnier2017b}. 187 191 188 192 The same reduction procedure described above is also performed in real … … 195 199 \ippstage{diff} stage. This allows the ongoing solar system moving 196 200 object search to identify candidates for follow up observations within 197 24 hours of the initial set of observations \citep{ WainscoatXXX}.201 24 hours of the initial set of observations \citep{2015IAUGA..2251124W}. 198 202 199 203 Section \ref{sec:detrending} provides an overview of the detrending … … 753 757 In addition to this flat field applied to the individual images, the 754 758 ubercal process used to calibrate the database of all detections 755 \citep{ ubercal} constructs internal ``flat field'' corrections.759 \citep{2012ApJ...756..158S} constructs internal ``flat field'' corrections. 756 760 Although a single set of image flat fields was used for the entire PV3 757 761 survey, five separate ``seasons'' of database flat fields were needed 758 762 to ensure proper calibration. This indicates that the flat field 759 763 response is not completely fixed in time. More details on this 760 process are contained in \citet{ calibration}.764 process are contained in \citet{magnier2017c}. 761 765 762 766 \subsection{Pattern correction} … … 1836 1840 individual input exposures against the reference catalog. Upon the 1837 1841 conclusion of the survey, the entire set of detection catalogs is 1838 further re-calibrated in the ``ubercal'' process \citep{ ubercal}.1842 further re-calibrated in the ``ubercal'' process \citep{2012ApJ...756..158S}. 1839 1843 This produces a more consistent calibration of each exposure across 1840 1844 the entire region of the sky imaged. This further calibration is not 1841 1845 available at the time of stacking, and so there may be small residuals 1842 in the transparency values as a result of this \citet{ calibration}.1846 in the transparency values as a result of this \citet{magnier2017c}. 1843 1847 1844 1848 %% \czwdraft{Nigel: 5. ``The ouput exposure time is set to the sum of the input exposure times.'' … … 1885 1889 With the flux normalization factors and target PSF chosen, the 1886 1890 convolution kernels can be calculated for each image. ISIS kernels 1887 \citep{ ISIS_kernels} are used with FWHM values of 1.5, 3.0, and 6.01891 \citep{1998ApJ...503..325A} are used with FWHM values of 1.5, 3.0, and 6.0 1888 1892 pixels and polynomial orders of 6, 4, and 2. Regions around the 1889 1893 sources identified in the input images are extracted, convolved with … … 2188 2192 data values must first be made positive, which then sets the highest 2189 2193 quantization sampling near the lowest values in the image. Following 2190 techniques used by SDSS \citep{ sdss}, we have instead opted to use the2194 techniques used by SDSS \citep{2000AJ....120.1579Y}, we have instead opted to use the 2191 2195 inverse hyperbolic sine function to transform the data. The domain of 2192 2196 this function allows any input value to be converted. In addition, … … 2309 2313 sources that are not static between the two images leave a significant 2310 2314 remnant. More information on the difference image construction is 2311 contained in \citet{p auls_diff_paper}. The follow section contains a2315 contained in \citet{price2017}. The follow section contains a 2312 2316 overview of the difference image construction used for the data in 2313 2317 DR2. … … 2332 2336 2333 2337 For warp-warp differences, such as those used for the ongoing Solar 2334 System moving object search in nightly observations \citep{ MOPS}, the2338 System moving object search in nightly observations \citep{2013PASP..125..357D}, the 2335 2339 warp that was taken first is used as the template. As there is less 2336 2340 certainty in which of the two input images will have better seeing, a … … 2351 2355 on ensuring that the telescope pointings are as close to identical as 2352 2356 possible. The observing strategy to enable this is discussed in more 2353 detail in \citet{ paper1}.2357 detail in \citet{chambers2017}. 2354 2358 2355 2359 … … 2465 2469 University (ELTE), and the Los Alamos National Laboratory. 2466 2470 2471 %\bibliography{lib}{} 2472 2467 2473 2468 2474 \end{document}
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