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Filters
Applying Information Theory to Design Optimal Filters for Photometric Redshifts
[article]
2020
arXiv
pre-print
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In this paper we apply ideas from information theory to create a method for the design of optimal filters for photometric redshift estimation. ...
Finally, we describe how information theory can be applied to a range of optimization problems in astronomy. ...
CONCLUSION We have introduced a new technique to apply information theory to the design of filters in order to optimize photometric redshifts. ...
arXiv:2001.01372v1
fatcat:agrv6bpifzajvlzu4l5bizab2a
An information-based metric for observing strategy optimization, demonstrated in the context of photometric redshifts with applications to cosmology
[article]
2021
arXiv
pre-print
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We propose a metric for observing strategy optimization based on the potentially recoverable mutual information about redshift from a photometric sample under the constraints of a realistic observing strategy ...
We recommend the use of this versatile metric to observing strategy optimization for redshift-dependent extragalactic use cases, including but not limited to cosmology, as well as any other science applications ...
It also demonstrates consistency with the results of Kalmbach et al. (2020) , who found that using information theory to optimize filters for photo-s corresponds to designing filters that can optimally ...
arXiv:2104.08229v1
fatcat:asvt27x7t5eevj4hvb4umtny2a
Large Synoptic Survey Telescope Galaxies Science Roadmap
[article]
2017
arXiv
pre-print
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The LSST Galaxies Science Collaboration has identified a host of preparatory research tasks required to leverage fully the LSST dataset for extragalactic science beyond the study of dark energy. ...
This Galaxies Science Roadmap provides a brief introduction to critical extragalactic science to be conducted ahead of LSST operations, and a detailed list of preparatory science tasks including the motivation ...
In addition to providing useful information about main-survey photometric redshift quality, the Deep Drilling Fields will pose particular challenges for photometric redshift determination, as spectroscopy ...
arXiv:1708.01617v1
fatcat:ifuatq7vkzbnljp7uggfbc2k5i
Calibrating Photometric Redshifts of Luminous Red Galaxies
[article]
2004
arXiv
pre-print
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2005 accepted doi:10.1111/j.1365-2966.2005.08915.x/abs/ arXiv:astro-ph/0407594v2 fatcat:qfmeyg77zrc33b2d4sywixvowu
The methods we develop are applicable to general photometric redshift surveys. ...
We also parametrize the photometric redshift error distribution with a sum of Gaussians, and use this model to deconvolve the errors from the measured photometric redshift distribution to estimate the ...
For the LRGs, we start with an elliptical template from Coleman et al. (1980) and apply the above algorithm to optimize it. ...
arXiv:astro-ph/0407594v1
fatcat:ptbolkv37vetdact7ovhbgq4du
Calibrating photometric redshifts of luminous red galaxies
2005
Monthly notices of the Royal Astronomical Society
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For the LRGs, we start with an elliptical template from Coleman et al. (1980) and apply the above algorithm to optimize it. ...
This single optimized template is used for an initial redshift estimate for all LRGs. ...
doi:10.1111/j.1365-2966.2005.08915.x
fatcat:5u2ohpna4jd4dhz4juw5dvmtwm
The first and second data releases of the Kilo-Degree Survey
2015
Astronomy and Astrophysics
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Designed for weak lensing shape and photometric redshift measurements, the core science driver of the survey is mapping the large-scale matter distribution in the Universe back to a redshift of ~0.5. ...
Early scientific results include the detection of nine high-z QSOs, fifteen candidate strong gravitational lenses, high-quality photometric redshifts and galaxy structural parameters for hundreds of thousands ...
Exposure times and observing constraints for the four filters are designed to match the atmospheric conditions on Paranal and optimized for the survey's main scientific goal of weak gravitational lensing ...
doi:10.1051/0004-6361/201526601
fatcat:zp2zeb3senc47f3nvbkxzpynu4
How Future Space-Based Weak-Lensing Surveys Might Obtain Photometric Redshifts Independently
2011
Publications of the Astronomical Society of the Pacific
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We study how the addition of on-board optical photometric bands to future space-based weak lensing instruments could affect the photometric redshift estimation of galaxies, and hence improve estimations ...
We find that adding two (U and G) or even one (U) on-board optical band-passes to the space-based infrared instrument greatly improves its photometric redshift performance, bringing it close to the level ...
High-performance computing resources for this work were supplied by the Atlantic Computational Excellence Network (ACEnet). ...
doi:10.1086/660843
fatcat:vdm7s4tpevc3vigig3dlcrrehi
A Composite Likelihood Approach for Inference under Photometric Redshift Uncertainty
[article]
2021
arXiv
pre-print
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We evaluate and forecast photometric redshift performance using data from the CosmoDC2 simulations, within which we mimic a DESI-like spectroscopic calibration sample for cross-correlations. ...
Obtaining accurately calibrated redshift distributions of photometric samples is one of the great challenges in photometric surveys like LSST, Euclid, HSC, KiDS, and DES. ...
We would like to thank the internal reviewers David Alonso, Will Hartley and David Kirkby for their insightful ...
arXiv:2101.01184v1
fatcat:aezw4zhhnbeajmagmrbf4awi4e
The Whole is Greater than the Sum of the Parts: Optimizing the Joint Science Return from LSST, Euclid and WFIRST
[article]
2015
arXiv
pre-print
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However, enabling the astronomy community to fully exploit this multi-instrument data set is a challenging technical task: for much of the science, we will need to combine the photometry across multiple ...
The sum of these surveys has the potential to be significantly greater than the contributions of the individual parts. ...
An ideal training set would span the full range of properties (including redshifts) of the galaxies to which photometric redshifts will be applied. ...
arXiv:1501.07897v2
fatcat:f6ftnvua2rdc3o5bx3ipoowake
J-PLUS: On the identification of new cluster members in the double galaxy cluster A2589 and A2593 using PDFs
2018
Astronomy and Astrophysics
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We aim to use multi-band imaging from the Phase-3 Verification Data of the J-PLUS survey to derive accurate photometric redshifts (photo-z) and look for potential new members in the surroundings of the ...
We present an optimized pipeline for the estimation of photo-z in clusters of galaxies. ...
Paladini at IAG/USP for helping with software installation. We thanks the anonymous referee for the careful reading of this manuscript and for her/his constructive comments and suggestions. ...
doi:10.1051/0004-6361/201731348
fatcat:hbmhaw5wtja2tm4qishplfjah4
Photometric Redshifts for Cosmology: Improving Accuracy and Uncertainty Estimates Using Bayesian Neural Networks
[article]
2022
arXiv
pre-print
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We turn to Bayesian neural networks (BNNs) as a promising way to provide accurate predictions of redshift values. ...
We evaluate the performance and accuracy of photometric redshift (photo-z) predictions from photometry using machine learning, astronomical and probabilistic metrics. ...
In a future work we will apply galaxy photometric images to a Bayesian convolutional neural network, which we believe will enhance the information present in the band fluxes. ...
arXiv:2202.07121v1
fatcat:b2ve2jq6ffb6ta3auwcc6hmici
Estimating Spectra from Photometry
2017
Astronomical Journal
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We are able to reduce the photometric redshifts standard deviation by at least 22.0 compared to original set for z ≤ 3. ...
Finally, we demonstrate the usefulness of our technique by generating 50 additional SED templates from an original set of 10 and applying the new set to photometric redshift estimation. ...
The authors would like to thank Chris Morrison and Scott Daniel for reading and providing comments on early drafts of this manuscript. This work was supported by the U.S. ...
doi:10.3847/1538-3881/aa9933
fatcat:wdpjlbc3k5dwng2kor56zvgjnm
SuperCLASS – II: Photometric Redshifts and Characteristics of Spatially-Resolved μJy Radio Sources
[article]
2020
arXiv
pre-print
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We derive photometric redshifts for ≈176,000 sources down to i^'_ AB∼24 and present photometric redshifts for 1.4 GHz e-MERLIN and VLA detected radio sources found in the central 0.26 deg^2. ...
We compile an initial catalog of 149 radio sources brighter than S_1.4>75μJy and find their photometric redshifts span 07 σ in the density map and we confirm the photometric redshifts are consistent with ...
ACKNOWLEDGEMENTS The authors thank the reviewer, Kenneth Duncan, for his helpful comments and suggestions. ...
arXiv:2003.01735v1
fatcat:xigthg2mrzhbba7eru3c6xuly4
Data-driven, Interpretable Photometric Redshifts Trained on Heterogeneous and Unrepresentative Data
2017
Astrophysical Journal
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Our model can also be used to predict missing photometric fluxes, or to simulate populations of galaxies with realistic fluxes and redshifts, for example. ...
We present a new method for inferring photometric redshifts in deep galaxy and quasar surveys, based on a data driven model of latent spectral energy distributions (SEDs) and a physical model of photometric ...
Figure 1 . 1 Photometric filters used for the data demonstration. ...
doi:10.3847/1538-4357/aa6332
fatcat:65qvfqhbkvgs5f5i55ucdp3urm
OUP accepted manuscript
2020
Monthly notices of the Royal Astronomical Society
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We derive photometric redshifts for ≈176,000 sources down to i AB ∼ 24 and present photometric redshifts for 1.4 GHz e-MERLIN and VLA detected radio sources found in the central 0.26 deg 2 . ...
Using the full photometric redshift catalog we construct a density map at the redshift of the known galaxy clusters, z = 0.20 ± 0.08. ...
ACKNOWLEDGEMENTS The authors thank the reviewer, Kenneth Duncan, for his helpful comments and suggestions. ...
doi:10.1093/mnras/staa657
fatcat:xts4ni3z7bhzhccxddy2ri6cae
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