PCAT-DE: Reconstructing point-like and diffuse signals in astronomical images using spatial and spectral information
arXiv:2307.10385 · doi:10.3847/1538-3881/ace69b
Abstract
Observational data from astronomical imaging surveys contain information about a variety of source populations and environments, and its complexity will increase substantially as telescopes become more sensitive. Even for existing observations, measuring the correlations between point-like and diffuse emission can be crucial to correctly inferring the properties of any individual component. For this task information is typically lost, either because of conservative data cuts, aggressive filtering or incomplete treatment of contaminated data. We present the code PCAT-DE, an extension of probabilistic cataloging designed to simultaneously model point-like and diffuse signals. This work incorporates both explicit spatial templates and a set of non-parametric Fourier component templates into a forward model of astronomical images, reducing the number of processing steps applied to the observed data. Using synthetic Herschel-SPIRE multiband observations, we demonstrate that point source and diffuse emission can be reliably separated and measured. We present two applications of this model. For the first, we perform point source detection/photometry in the presence of galactic cirrus and demonstrate that cosmic infrared background (CIB) galaxy counts can be recovered in cases of significant contamination. In the second we show that the spatially extended thermal Sunyaev-Zel'dovich (tSZ) effect signal can be reliably measured even when it is subdominant to the point-like emission from individual galaxies.
arXiv comment23 pages, 13 figures, Accepted for publication in The Astronomical Journal
References in corpus (53)
- The Herschel-SPIRE instrument and its in-flight performance
- Planck 2013 results. XI. All-sky model of thermal dust emission
- Dusty Star-Forming Galaxies at High Redshift
- The Herschel Multi-tiered Extragalactic Survey: HerMES
- Relativistic Corrections to the Sunyaev-Zel'dovich Effect for Clusters of Galaxies
- HerMES: The SPIRE confusion limit
- A unified empirical model for infrared galaxy counts based on observed physical evolution of distant galaxies
- ProFound: Source Extraction and Application to Modern Survey Data
- The Apparently Decaying Orbit of WASP-12
- The Herschel Multi-Tiered Extragalactic Survey: Source Extraction and Cross-Identifications in Confusion-Dominated SPIRE Images
- A multi-scale, multi-wavelength source extraction method: getsources
- HerMES: Cosmic Infrared Background Anisotropies and the Clustering of Dusty Star-Forming Galaxies
- Peculiar velocities of galaxies and clusters
- Source extraction and photometry for the far-infrared and sub-millimeter continuum in the presence of complex backgrounds
- The data reduction pipeline for the Hi-GAL survey
- On the Origin of Near-Infrared Extragalactic Background Light Anisotropy
- A fast and accurate method for computing the Sunyaev-Zeldovich signal of hot galaxy clusters
- HerMES: Deep Galaxy Number Counts from a P(D) Fluctuation Analysis of SPIRE Science Demonstration Phase Observations
- The Herschel Lensing Survey (HLS): overview
- Exploring Cluster Physics with High-Resolution Sunyaev-Zel'dovich Effect Images and X-Ray Data: The Case of the Most X-Ray-Luminous Galaxy Cluster RX J1347-1145
- An 850-micron SCUBA map of the Groth Strip and reliable source extraction
- Substructures revealed by the Sunyaev-Zel'dovich effect at 150GHz in the high resolution map of RXJ1347-1145
- Deep 3 GHz Number Counts from a P(D) Fluctuation Analysis
- Evaluation of probabilistic photometric redshift estimation approaches for The Rubin Observatory Legacy Survey of Space and Time (LSST)
- Planck's view on the spectrum of the Sunyaev-Zeldovich effect
- Detecting stars, galaxies, and asteroids with Gaia
- MORESANE: MOdel REconstruction by Synthesis-ANalysis Estimators. A sparse deconvolution algorithm for radio interferometric imaging
- Distribution function of the dark matter
- The Dark Energy Camera Plane Survey 2 (DECaPS2): More Sky, Less Bias, and Better Uncertainties
- Fast Bayesian Inference for Exoplanet Discovery in Radial Velocity Data
- Imaging the Thermal and Kinematic Sunyaev-Zel'dovich Effect Signals in a Sample of Ten Massive Galaxy Clusters: Constraints on Internal Velocity Structures and Bulk Velocities
- A Comparison and Joint Analysis of Sunyaev-Zel'dovich Effect Measurements from Planck and Bolocam for a set of 47 Massive Galaxy Clusters
- Herschel-ATLAS: Statistical Properties of Galactic Cirrus in the GAMA-9 Hour Science Demonstration Phase Field
- The Sunyaev-Zel'dovich Effect at Five Arc-seconds: RXJ1347.5-1145 Imaged by ALMA
- High Spectral Resolution Measurement of the Sunyaev-Zel'dovich Effect Null with Z-Spec
- Probing the small-scale structure in strongly lensed systems via transdimensional inference
- Radio Source Extraction with ProFound
- Probabilistic Catalogs for Crowded Stellar Fields
- Astrophysics & Cosmology from Line Intensity Mapping vs Galaxy Surveys
- Peculiar Velocity Constraints from Five-Band SZ Effect Measurements Towards RX J1347.5-1145 with MUSIC and Bolocam from the CSO
- DAWIS, a Detection Algorithm with Wavelets for Intracluster light Studies
- A Method for Individual Source Brightness Estimation in Single- and Multi-band Data
- Inference of Unresolved Point Sources At High Galactic Latitudes Using Probabilistic Catalogs
- Optimal matched filter in the low-number count Poisson noise regime and implications for X-ray source detection
- HerMES: A Deficit in the Surface Brightness of the Cosmic Infrared Background Due to Galaxy Cluster Gravitational Lensing
- Disentangling Overlapping Astronomical Sources using Spatial and Spectral Information
- Photometric Biases in Modern Surveys
- A Generative Model of Galactic Dust Emission Using Variational Inference
- Multiband Probabilistic Cataloging: A Joint Fitting Approach to Point Source Detection and Deblending
- A Compound Poisson Generator approach to Point-Source Inference in Astrophysics
- Optimally Mapping Large-Scale Structures with Luminous Sources
- Measurement of the Relativistic Sunyaev-Zeldovich Corrections in RX J1347.5-1145
- Generative Models of Multi-channel Data from a Single Example -- Application to Dust Emission