A novel multi-frequency technique for the detection of point sources in Cosmic Microwave Background maps
arXiv:0808.2884 · doi:10.1111/j.1365-2966.2008.14336.x
Abstract
In this work we address the problem of simultaneous multi-frequency detection of extragalactic point sources in maps of the Cosmic Microwave Background. We apply a new linear filtering technique, the so called `matched matrix filters', that incorporates full spatial information, including the cross-correlation among channels, without making any a priori assumption about the spectral behaviour of the sources. A substantial reduction of the background is achieved thanks to the optimal combination of filtered maps. We describe in detail the new technique and we apply it to the detection/estimation of radio sources in realistic all-sky Planck simulations at 30, 44, 70 and 100 GHz. Then we compare the results with the mono-frequential approach based on the standard matched filter, in terms of reliability, completeness and flux accuracy of the resulting point source catalogs. The new filters outperform the standard matched filters for all these indexes at 30, 44 and 70 GHz, whereas at 100 GHz both kind of filters have a similar performance. We find a noticeable increment of the number of true detections for a fixed reliability level. In particular, for a 95% reliability we practically double the number of detections at 30, 44 and 70 GHz.
12 pages, 10 figures, submitted to MNRAS
References in corpus (29)
- HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
- Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
- Extrapolation of Galactic Dust Emission at 100 Microns to CMBR Frequencies Using FIRAS
- The Microwave Anisotropy Probe (MAP) Mission
- Predictions for high-frequency radio surveys of extragalactic sources
- Extragalactic Source Counts and Contributions to the Anisotropies of the Cosmic Microwave Background. Predictions for the Planck Surveyor mission
- Towards a free-free template for CMB foregrounds
- Removing point sources from CMB maps
- The Mexican Hat Wavelet Family. Application to point source detection in CMB maps
- A Bayesian approach to discrete object detection in astronomical datasets
- Predictions on high frequency polarization properties of extragalactic radio sources and implications for CMB polarization measurements
- Point Source Detection using the Spherical Mexican Hat Wavelet on simulated all-sky Planck maps
- Predictions on the angular power spectrum of clustered extragalactic point sources at CMB frequencies from flat and all--sky 2D-simulations
- Limits on the detectability of the CMB B-mode polarization imposed by foregrounds
- Comparison of filters for the detection of point sources in Planck simulations
- Non-blind catalogue of extragalactic point sources from the Wilkinson Microwave Anisotropy Probe (WMAP) first 3--year survey data
- Optimal detection of sources on a homogeneous and isotropic background
- Combining maximum-entropy and the mexican hat wavelet to reconstruct the microwave sky
- Scale-Adaptive filters for the detection/separation of compact sources
- The effect of point sources on satellite observations of the cosmic microwave background
- Matrix Filters for the Detection of Extragalactic Point Sources in Cosmic Microwave Background Images
- Comparing filters for the detection of point sources
- Filter design for the detection of compact sources based on the Neyman-Pearson detector
- Point source detection and extraction from simulated Planck TOD using optimal adaptive filters
- An adaptive filter for the PLANCK Compact Source Catalogue construction
- Extragalactic Point Source Search in WMAP 61 and 94 GHz Data
- Combined multi-frequency map for point source substraction
- A Bayesian approach to filter design: detection of compact sources
- Detection of point sources on two-dimensional images based on peaks
Cited by in corpus (19)
- Planck 2013 results. I. Overview of products and scientific results
- Planck 2013 results. XXVIII. The Planck Catalogue of Compact Sources
- Herschel-ATLAS: First data release of the Science Demonstration Phase source catalogues
- Planck pre-launch status: the Planck-LFI programme
- Polarization of the WMAP Point Sources
- Planck intermediate results. LIV. The Planck Multi-frequency Catalogue of Non-thermal Sources
- Firedec: a two-channel finite-resolution image deconvolution algorithm
- ALMA photometry of extragalactic radio sources
- Subtraction of Bright Point Sources from Synthesis Images of the Epoch of Reionization
- Detection/estimation of the modulus of a vector. Application to point source detection in polarization data
- A multifrequency method based on the Matched Multifilter for the detection of point sources in CMB maps
- Probing Cosmic Strings with Satellite CMB measurements
- Compact source detection in multi-channel microwave surveys: from SZ clusters to polarized sources
- Multifrequency filter search for high redshift sources and lensing systems in Herschel-ATLAS
- The C-Band All-Sky Survey (C-BASS): Total intensity point-source detection over the northern sky
- An approach for the detection of point-sources in very high resolution microwave maps
- Constraining the polarisation flux density and angle of point sources by training a convolutional neural network
- Multi-frequency point source detection with fully convolutional networks: Performance in realistic microwave sky simulations
- A theoretical framework for the detection of point-sources in Cosmic Microwave Background maps