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arXiv 2104.12752astro-ph.IM
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Euclid：用Euclid NISP仪器测量通量时相关读出噪声影响的估计

Euclid: Estimation of the impact of correlated readout noise for flux measurements with the Euclid NISP instrument

A. Jimenez Munoz, J. Macias-Perez, A. Secroun, W. Gillard, B. Kubik, N. Auricchio, A. Balestra, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann… 展开作者

A. Jimenez Munoz, J. Macias-Perez, A. Secroun, W. Gillard, B. Kubik, N. Auricchio, A. Balestra, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, V. Capobianco, C. Carbone, J. Carretero, R. Casas, M. Castellano, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, L. Conversi, Y. Copin, L. Corcione, A. Costille, M. Cropper, H. Degaudenzi, M. Douspis, F. Dubath, S. Dusini, A. Ealet, E. Franceschi, P. Franzetti, M. Fumana, B. Garilli, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, S. V. H. Haugan, W. Holmes, F. Hormuth, K. Jahnke, S. Kermiche, A. Kiessling, M. Kilbinger, M. Kummel, M. Kunz, H. Kurki-Suonio, R. Laureijs, S. Ligori, P. B. Lilje, I. Lloro, E. Maiorano, O. Mansutti, O. Marggraf, K. Markovic, R. Massey, E. Medinaceli, S. Mei, M. Meneghetti, G. Meylan, L. Moscardini, S. M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, S. Pires, G. Polenta, M. Poncet, L. Popa, L. Pozzetti, F. Raison, R. Rebolo, M. Roncarelli, E. Rossetti, R. Saglia, M. Sauvage, R. Scaramella, P. Schneider, G. Seidel, S. Serrano, C. Sirignano, G. Sirri, D. Tavagnacco, A. N. Taylor, H. I. Teplitz, I. Tereno, R. Toledo-Moreo, L. Valenziano, T. Vassallo, G. A. Verdoes Kleijn, Y. Wang, J. Weller, M. Wetzstein, G. Zamorani, J. Zoubian

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摘要：

Euclid卫星将于2022年由欧空局发射，将成为未来几十年宇宙学的主要工具。\Euclid \由两台仪器组成：可见光（VIS）仪器和近红外光谱仪和光度计（NISP）。在这项工作中，我们估计的影响相关读出噪声在NISP探测器的最终飞行中的通量测量。考虑到多个累积（MACC）读出模式，其中UTR（上升斜坡）曝光帧平均分组，我们推导出一个分析表达式的噪声协方差矩阵组之间的相关噪声的存在。我们还描述了相关读出噪声特性的NISP工程级探测器使用长暗积分。为此，我们假设一个$(1/f)^{\, α}$样噪声模型，并拟合模型参数的数据，获得典型值的$σ= 19.7^{+1.1}_{-0.8}$ e $^{-} \rm{Hz}^{-0.5}$，$f_{\rm{knee}} = (5.2^{+1.8}_{-1.3}) \times 10^{-3} \, \rm{Hz}$和$α= 1.24 ^{+0.26}_{-0.21}$。此外，通过现实的模拟和使用极大似然通量估计，我们得到的输入通量和恢复之间的偏差。我们发现，使用我们的相关读出噪声的协方差矩阵的分析表达式，我们减少这种偏差的四个因素的白噪声近似的协方差矩阵。最后，我们得出结论，即使在白噪声近似下，飞行中NISP通量测量的最终偏差仍然可以忽略不计，这是欧几里得\on板处理的基线

英文摘要：

The Euclid satellite, to be launched by ESA in 2022, will be a major instrument for cosmology for the next decades. \Euclid\ is composed of two instruments: the Visible (VIS) instrument and the Near Infrared Spectromete and Photometer (NISP). In this work we estimate the implications of correlated readout noise in the NISP detectors for the final in-flight flux measurements. Considering the multiple accumulated (MACC) readout mode, for which the UTR (Up The Ramp) exposure frames are averaged in groups, we derive an analytical expression for the noise covariance matrix between groups in the presence of correlated noise. We also characterize the correlated readout noise properties in the NISP engineering grade detectors using long dark integrations. For this purpose, we assume a $(1/f)^{\, α}$-like noise model and fit the model parameters to the data, obtaining typical values of $σ= 19.7^{+1.1}_{-0.8}$ e$^{-} \rm{Hz}^{-0.5}$, $f_{\rm{knee}} = (5.2^{+1.8}_{-1.3}) \times 10^{-3} \, \rm{Hz}$ and $α= 1.24 ^{+0.26}_{-0.21}$. Furthermore, via realistic simulations and using a maximum likelihood flux estimator we derive the bias between the input flux and the recovered one. We find that using our analytical expression for the covariance matrix of the correlated readout noise we diminish this bias by up to a factor of four with respect to the white noise approximation for the covariance matrix. Finally, we conclude that the final bias on the in-flight NISP flux measurements should still be negligible even in the white noise approximation, which is taken as a baseline for the Euclid\on-board processing

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