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- W4200466837 abstract "We present a new application of deep learning to reconstruct the cosmic microwave background (CMB) temperature maps from the images of microwave sky, and to use these reconstructed maps to estimate the masses of galaxy clusters. We use a feed-forward deep learning network, mResUNet, for both steps of the analysis. The first deep learning model, mResUNet-I, is trained to reconstruct foreground and noise suppressed CMB maps from a set of simulated images of the microwave sky that include signals from the cosmic microwave background, astrophysical foregrounds like dusty and radio galaxies, instrumental noise as well as the cluster's own thermal Sunyaev Zel'dovich signal. The second deep learning model, mResUNet-II, is trained to estimate cluster masses from the gravitational lensing signature in the reconstructed foreground and noise suppressed CMB maps. For SPTpol-like noise levels, the trained mResUNet-II model recovers the mass for $10^4$ galaxy cluster samples with a 1-$sigma$ uncertainty $Delta M_{rm 200c}^{rm est}/M_{rm 200c}^{rm est} =$ 0.108 and 0.016 for input cluster mass $M_{rm 200c}^{rm true}=10^{14}~rm M_{odot}$ and $8times 10^{14}~rm M_{odot}$, respectively. We also test for potential bias on recovered masses, finding that for a set of $10^5$ clusters the estimator recovers $M_{rm 200c}^{rm est} = 2.02 times 10^{14}~rm M_{odot}$, consistent with the input at 1% level. The 2 $sigma$ upper limit on potential bias is at 3.5% level." @default.
- W4200466837 created "2021-12-31" @default.
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- W4200466837 date "2021-12-01" @default.
- W4200466837 modified "2023-10-07" @default.
- W4200466837 title "Mass Estimation of Galaxy Clusters with Deep Learning II. Cosmic Microwave Background Cluster Lensing" @default.
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- W4200466837 doi "https://doi.org/10.3847/1538-4357/ac32d0" @default.
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