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trunk/doc/release.2015/systematics.20140411/systematics.tex
r40096 r40097 7 7 %\documentclass[preprint2]{aastex} 8 8 %\documentclass[preprint2,longabstract]{aastex} 9 10 \RequirePackage{graphicx} 9 11 \RequirePackage{color} 12 \RequirePackage{code} 10 13 \input{astro.sty} 14 15 \usepackage[T1]{fontenc}% (2) specify encoding 11 16 12 17 % online version may use color, but print version needs b/w … … 17 22 \def\plotext{ps} 18 23 19 %\def\picdir{/home/eugene/chipresid.20140404}20 \def\picdir{/data/kukui.2/eugene/chipresid.20140404}24 \def\picdir{/home/eugene/chipresid.20140404} 25 %\def\picdir{/data/kukui.2/eugene/chipresid.20140404} 21 26 22 27 % Pick a terse version of the title here; … … 108 113 The 1.8m Pan-STARRS\,1 telescope (PS1), located on the summit of 109 114 Haleakala on the Hawaiian island of Maui, has been surveying the sky 110 regularly since May 2010 \citep{chambers .2017}. From May 2010 through115 regularly since May 2010 \citep{chambers2017}. From May 2010 through 111 116 March 2014, PS1 was run under the aegis of the Pan-STARRS Science 112 117 Consortium to perform a set of wide-field science surveys; since March … … 118 123 observations were distributed over five filters, \grizy, and have been 119 124 astrometrically and photometrically calibrated to good precision 120 \citep{magnier.2017.calibration}. 121 122 The wide-field PS1 telescope optics \citep{PS1.optics} image a 3.3 123 degree field of view on a 1.4 gigapixel camera \citep[GPC1][]{PS1.GPC1}, with 124 low distortion and generally good image quality. The median seeing 125 for the \TPS\ data vary somewhat by filter, with (\grizy) = (XXXX). 126 Routine observations are conducted remotely from the Advanced 127 Technology Research Center in Kula, the main facility of the 128 University of Hawaii's Institute for Astronomy operations on Maui. 129 130 GPC1 \citep{PS1.GPCA}, currently the largest astronomical camera in 125 \citep{magnier2017.calibration}. 126 127 % 2004SPIE.5489..667H == PS1.optics 128 % 2008SPIE.7014E..0DO == PS1.GPCB 129 % 2009amos.confE..40T == PS1.GPCA 130 % 2012ApJ...756..158S == ubercal 131 The wide-field PS1 telescope optics \citep{2004SPIE.5489..667H} image 132 a 3.3 degree field of view on a 1.4 gigapixel camera 133 \citep[GPC1][]{2009amos.confE..40T}, with low distortion and generally 134 good image quality. The median seeing for the \TPS\ data vary 135 somewhat by filter, with (\grizy) = (XXXX). Routine observations are 136 conducted remotely from the Advanced Technology Research Center in 137 Kula, the main facility of the University of Hawaii's Institute for 138 Astronomy operations on Maui. 139 140 GPC1 \citep{2009amos.confE..40T}, currently the largest astronomical camera in 131 141 terms of number of pixels, consists of a mosaic of 60 edge-abutted 132 142 $4800\times4800$ pixel detectors, with 10~$\mu$m pixels subtending … … 135 145 readout time of 7 seconds for a full unbinned image. \note{details 136 146 about the voltages?} Initial performance assessments are presented 137 in \cite{ PS1.GPCB}. The active, usable pixels cover $\sim 80$\% of the147 in \cite{2008SPIE.7014E..0DO}. The active, usable pixels cover $\sim 80$\% of the 138 148 FOV. 139 149 140 150 \subsection{Data Processing and Calibration} 141 151 152 % PS1_IPP = \bibitem[Magnier(2006)]{PS1.IPP} Magnier, E.\ 2006, 153 % Proceedings of The Advanced Maui Optical and Space Surveillance 154 % Technologies Conference, Ed.: S. Ryan, The Maui Economic Development 155 % Board, p.E5 156 142 157 Images obtained by PS1 are processed by the Pan-STARRS Image 143 Processing Pipeline (IPP; \citealp{PS1_IPP, 144 magnier.etal.2016.datasystem}). All observations are processed 158 Processing Pipeline (IPP; \citealp{PS1_IPP,magnier2017.datasystem}). All observations are processed 145 159 nightly, with results sent to groups within the science consortium 146 160 (i.e., PS1SC during the \TPS) performing short-term science projects … … 157 171 The data processing and calibration operations are discussed in detail 158 172 in elsewhere 159 \citep{magnier .etal.2017.analysis,magnier.etal.2017.calibration,waters.2017}.173 \citep{magnier2017.analysis,magnier2017.calibration,waters2017}. 160 174 We re-visit here a number of points that are of significance to this 161 175 study. Images are processed following a fairly standard sequence of … … 168 182 the initial analysis steps. 169 183 170 As discussed in \cite{waters.2017}, image detrending includes 184 % Magnier.belgium: 185 % \bibitem[Magnier(2007)]{PS1.photometry} Magnier, E.\ 2007, The Future 186 % of Photometric, Spectrophotometric and Polarimetric Standardization, ASP Conference Series {\bf 364}, 153 187 188 %IPP astrometry (NOT USED) 189 % \bibitem[Magnier {\it et al.}(2008)]{PS1.astrometry} Magnier, E.~A., Liu, 190 % M., Monet, D.~G., \& Chambers, K.~C.\ 2008, IAU Symposium, {\bf 248}, 553 191 192 As discussed in \cite{waters2017}, image detrending includes 171 193 flat-field processing with a single epoch flat-field image for each 172 194 filter. The flat-field image used for this analysis has been … … 180 202 factors which may make the flat-field image inconsistent with stellar 181 203 photometry, e.g., SED, filter band-pass variations, etc 182 \citep[see][]{waters .2017,magnier.cuillandre,magnier.belgium}. This204 \citep[see][]{waters2017,2004PASP..116..449M,magnier.belgium}. This 183 205 correction was made on a relatively coarse grid across the focal plane 184 206 in order to accumulate sufficient statistics from the stars in the … … 192 214 Photometry of the PS1 images is performed using a 193 215 point-spread-function (PSF) model as well as multiple kinds of 194 apertures \citep{magnier .etal.2017.analysis}. In this analysis, we216 apertures \citep{magnier2017.analysis}. In this analysis, we 195 217 refer to aperture photometry performed using an aperture defined based 196 218 on the image quality observed for a given chip. The aperture diameter … … 201 223 photometry is re-calibrated within the databasing system based on the 202 224 properties of the measured photometry. The calibration process is 203 discussed by \cite{ ubercal,photladder,magnier.etal.2017.calibration}.225 discussed by \cite{2012ApJ...756..158S,2013ApJS..205...20M,magnier2017.calibration}. 204 226 As part of this process, several flat-field corrections have been 205 227 determined. For the PV2 analysis discussed here, a flat-field 206 228 correction determined during the ubercal analysis 207 \citep[see][]{ ubercal} consisted of an $8\times 8$ grid of corrections229 \citep[see][]{2012ApJ...756..158S} consisted of an $8\times 8$ grid of corrections 208 230 for each GPC1 chip and filter for each of 4 seasons. The boundaries 209 231 of those seasons are \note{tentatively} identified with modifications … … 218 240 brighter sources (using a non-linear fitting process) and from a 219 241 simple centroid (1st moment) for the fainter source 220 \citep{magnier .etal.2017.analysis}. These position measurements are242 \citep{magnier2017.analysis}. These position measurements are 221 243 used in the astrometric analysis. The astrometric calibration is 222 discussed by \cite{magnier .etal.2017.calibration}; for the PV2244 discussed by \cite{magnier2017.calibration}; for the PV2 223 245 dataset, the typical systematic floor is \approx 15 - 20 224 246 milliarcsecond for individual measurements of brighter stars. … … 428 450 \end{figure*} 429 451 452 % 2012ApJ...750...99T = Tonry et al PS1 phot system 430 453 Figure~\ref{fig:flats.by.filter} shows the high-spatial-frequency 431 454 structures in the flat-field images. For this measurement, we have … … 434 457 then observed by the PS1 telescope. These flat-field images were 435 458 obtained 2011 Feb 09 as part of a campaign to study the PS1 system 436 response \citep{ tonry.phot}. Flats were obtain in a set of 4nm steps,459 response \citep{2012ApJ...750...99T}. Flats were obtain in a set of 4nm steps, 437 460 with \note{XXnm} band-pass. To enhance the signal-to-noise, we have 438 461 median-combined a set of 6 flats at the center of the corresponding filter. … … 511 534 objects is biased down by the weighting function, this is not quite 512 535 the same as having $\sigma_{w} = 1.6$ times the true PSF $\sigma$, see 513 discussion in \citealt{magnier .etal.2017.analysis}). For each stellar536 discussion in \citealt{magnier2017.analysis}). For each stellar 514 537 detection, we extract the values $M_{xx,xy,yy} = \sum F_i w_i (x^2, x 515 538 y, y^2) / \sum F_i w_i$. For each exposure, we find the mean second … … 522 545 523 546 Using the second moment images, we can construct certain interesting 524 combinations, inspired by discussions of lensing measurements \citep{ kaiser.1995}:547 combinations, inspired by discussions of lensing measurements \citep{1995ApJ...449..460K}: 525 548 \begin{eqnarray} 526 549 R^2 & = & \delta M_{xx} + \delta M_{yy} \\ … … 828 851 deviations are correlated with the radial derivative of the smearing. 829 852 853 \acknowledgments 854 855 The Pan-STARRS1 Surveys (PS1) have been made possible through 856 contributions of the Institute for Astronomy, the University of 857 Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its 858 participating institutes, the Max Planck Institute for Astronomy, 859 Heidelberg and the Max Planck Institute for Extraterrestrial Physics, 860 Garching, The Johns Hopkins University, Durham University, the 861 University of Edinburgh, Queen's University Belfast, the 862 Harvard-Smithsonian Center for Astrophysics, the Las Cumbres 863 Observatory Global Telescope Network Incorporated, the National 864 Central University of Taiwan, the Space Telescope Science Institute, 865 the National Aeronautics and Space Administration under Grant 866 No. NNX08AR22G issued through the Planetary Science Division of the 867 NASA Science Mission Directorate, the National Science Foundation 868 under Grant No. AST-1238877, the University of Maryland, and Eotvos 869 Lorand University (ELTE) and the Los Alamos National Laboratory. 870 871 \bibliographystyle{apj} 872 \bibliography{lib}{} 873 %\input{analysis.bbl} 874 830 875 \end{document} 831 876
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