Publications

Publications


Unsupervised feature learning for galaxy SEDs with denoising autoencoders

  Authors: Frontera-Pons, J., Sureau, F., Bobin, J. and Le Floc'h E. Journal: Astronomy & Astrophysics Year: 2017 Download: ADS | arXiv Abstract W.
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Unsupervised feature learning for galaxy SEDs with denoising autoencoders

PSF field learning based on Optimal Transport Distances

  Authors: F. Ngolè Mboula, J-L. Starck Journal:  arXiv Year: 2017 Download: ADS | arXiv   Abstract Context: in astronomy, observing large fractions of the sky within a reasonable amount of time
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PSF field learning based on Optimal Transport Distances

Joint Multichannel Deconvolution and Blind Source Separation

  Authors: M. Jiang, J. Bobin, J-L. Starck Journal: arXiv Year: 2017 Download: ADS | arXiv   Abstract Blind Source Separation (BSS) is a challenging matrix factorization problem that plays a central
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Joint Multichannel Deconvolution and Blind Source Separation

Space variant deconvolution of galaxy survey images

  Authors: S. Farrens, J-L. Starck, F. Ngolè Mboula Journal: A&A Year: 2017 Download: ADS | arXiv Abstract Removing the aberrations introduced by the Point Spread Function (PSF) is a fundamental
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Space variant deconvolution of galaxy survey images

Weak-lensing projections

Authors: M. Kilbinger, C. Heymans et al. Journal: submitted to MNRAS Year: 2017 Download: ADS | arXiv Abstract We compute the spherical-sky weak-lensing power spectrum of the shear
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Weak-lensing projections


  • Unsupervised feature learning for galaxy SEDs with denoising autoencoders

    Unsupervised feature learning for galaxy SEDs with denoising autoencoders

      Authors: Frontera-Pons, J., Sureau, F., Bobin, J. and Le Floc'h E. Journal: Astronomy & Astrophysics Year: 2017 Download: ADS | arXiv Abstract W.
  • PSF field learning based on Optimal Transport Distances

    PSF field learning based on Optimal Transport Distances

      Authors: F. Ngolè Mboula, J-L. Starck Journal:  arXiv Year: 2017 Download: ADS | arXiv   Abstract Context: in astronomy, observing large fractions of the sky within a reasonable amount of time implies using large field-of-view (fov) optical instruments that typically have a spatially varying Point Spread Function (PSF). Depending on …
  • Joint Multichannel Deconvolution and Blind Source Separation

    Joint Multichannel Deconvolution and Blind Source Separation

      Authors: M. Jiang, J. Bobin, J-L. Starck Journal: arXiv Year: 2017 Download: ADS | arXiv   Abstract Blind Source Separation (BSS) is a challenging matrix factorization problem that plays a central role in multichannel imaging science. In a large number of applications, such as astrophysics, current unmixing methods are limited …
  • Space variant deconvolution of galaxy survey images

    Space variant deconvolution of galaxy survey images

      Authors: S. Farrens, J-L. Starck, F. Ngolè Mboula Journal: A&A Year: 2017 Download: ADS | arXiv Abstract Removing the aberrations introduced by the Point Spread Function (PSF) is a fundamental aspect of astronomical image processing. The presence of noise in observed images makes deconvolution a nontrivial task that necessitates the …
  • Weak-lensing projections

    Weak-lensing projections

    Authors: M. Kilbinger, C. Heymans et al. Journal: submitted to MNRAS Year: 2017 Download: ADS | arXiv Abstract We compute the spherical-sky weak-lensing power spectrum of the shear and convergence. We discuss various approximations, such as flat-sky, and first- and second- order Limber equations for the projection. We find that the …
  • nIFTy Cosmology: the clustering consistency of galaxy formation models

    nIFTy Cosmology: the clustering consistency of galaxy formation models

    nIFTy Cosmology: the clustering consistency of galaxy formation models  Authors: A. Pujol, R. A. Skibba, E. Gaztañaga et al. Journal: MNRAS Year: 02/2017 Download: ADS| Arxiv nIFTy Cosmology: the clustering consistency of galaxy formation models Abstract We present a clustering comparison of 12 galaxy formation models (including Semi-Analytic Models (SAMs) and …
  • What determines large scale galaxy clustering: halo mass or local density?

    What determines large scale galaxy clustering: halo mass or local density?

    What determines large scale galaxy clustering: halo mass or local density?  Authors: A. Pujol, K. Hoffmann, N. Jiménez et al. Journal: A&A Year: 02/2017 Download: ADS| Arxiv What determines large scale galaxy clustering: halo mass or local density? Abstract Using a dark matter simulation we show how halo bias is determined …
  • Cosmological constraints with weak-lensing peak counts and second-order statistics in a large-field survey

    Cosmological constraints with weak-lensing peak counts and second-order statistics in a large-field survey

      Authors: A. Peel, C.-A. Lin, F. Lanusse, A. Leonard, J.-L. Starck, M. Kilbinger Journal: A&A Year: 2017 Download: ADS | arXiv   Abstract Peak statistics in weak lensing maps access the non-Gaussian information contained in the large-scale distribution of matter in the Universe. They are therefore a promising complement to …
  • A new method to measure galaxy bias by combining the density and weak lensing fields

    A new method to measure galaxy bias by combining the density and weak lensing fields

    A new method to measure galaxy bias by combining the density and weak lensing fields  Authors: A. Pujol, C. Chang, E. Gaztañaga et al. Journal: MNRAS Year: 10/2016 Download: ADS| Arxiv A new method to measure galaxy bias by combining the density and weak lensing fields Abstract We present a new …
  • Blind separation of sparse sources in the presence of outliers

    Blind separation of sparse sources in the presence of outliers

      Authors: C.Chenot, J.Bobin Journal: Signal Processing, Elsevier Year: 2016 Download: Elsevier / Preprint     Abstract   Blind Source Separation (BSS) plays a key role to analyze multichannel data since it aims at recovering unknown underlying elementary sources from observed linear mixtures in an unsupervised way. In a large number of …
  • Constraint matrix factorization for space variant PSFs field restoration

    Constraint matrix factorization for space variant PSFs field restoration

      Authors: F. Ngolè Mboula, J-L. Starck, K. Okumura, J. Amiaux, P. Hudelot Journal: SIAM Year: 2016 Download: ADS | arXiv   Abstract Context: in large-scale spatial surveys, the Point Spread Function (PSF) varies across the instrument field of view (FOV). Local measurements of the PSFs are given by the isolated …
  • The Dark Energy Survey and operations: years 1 to 3

    The Dark Energy Survey and operations: years 1 to 3

    The Dark Energy Survey and operations: years 1 to 3  Authors: H. T. Diehl, E. Neilsen, R. Gruendl et al. Journal: Proceedings of the SPIE Year: 07/2016 Download: ADS The Dark Energy Survey and operations: years 1 to 3 Abstract The Dark Energy Survey (DES) is an operating optical survey aimed …
  • Galaxy bias from the Dark Energy Survey Science Verification data: combining galaxy density maps and weak lensing maps

    Galaxy bias from the Dark Energy Survey Science Verification data: combining galaxy density maps and weak lensing maps

    Galaxy bias from the Dark Energy Survey Science Verification data: combining galaxy density maps and weak lensing maps  Authors: C. Chang, A. Pujol, E. Gaztañaga et al. Journal: MNRAS Year: 07/2016 Download: ADS| Arxiv Galaxy bias from the Dark Energy Survey Science Verification data: combining galaxy density maps and weak lensing …
  • Variational Bayes Group Sparse Time-Adaptive Parameter Estimation With Either Known or Unknown Sparsity Pattern

    Variational Bayes Group Sparse Time-Adaptive Parameter Estimation With Either Known or Unknown Sparsity Pattern

      Authors: K. E. Themelis, A. A. Rontogiannis, K. D. Koutroumbas Journal: IEEE Transactions on Signal Processing Year: 2016 Download: ieeexplore     Abstract In this paper, we study the problem of time-adaptive group sparse signal estimation from a Bayesian viewpoint. We propose two online variational Bayes schemes that are …
  • Simultaneously sparse and low-rank abundance matrix estimation for hyperspectral image unmixing

    Simultaneously sparse and low-rank abundance matrix estimation for hyperspectral image unmixing

      Authors: P. V. Giampouras, K. E. Themelis, A. A. Rontogiannis, K. D. Koutroumbas Journal: IEEE Transactions on Geoscience and Remote Sensing Year: 2016 Download: ieeexplore     Abstract In a plethora of applications dealing with inverse problems, e.g., image processing, social networks, compressive sensing, and biological data processing, the …
  • The XXL Survey

    The XXL Survey

    First round of papers published   The XXL Survey is a deep X-ray survey observed with the XMM satellite, covering two fields of 25 deg2 each. Observations in many other wavelength, from radio to IR and optical, in both imaging and spectroscopy, complement the survey. The main science case is …
  • nIFTy cosmology: comparison of galaxy formation models

    nIFTy cosmology: comparison of galaxy formation models

    nIFTy cosmology: comparison of galaxy formation models  Authors: A. Knebe, F. R. Pearce, P. A. Thomas et al. Journal: MNRAS  Year: 08/2015 Download: ADS|Arxiv nIFTy cosmology: comparison of galaxy formation models Abstract We present a comparison of 14 galaxy formation models: 12 different semi-analytical models and 2 halo occupation distribution models …
  • Robust Sparse Blind Source Separation

    Robust Sparse Blind Source Separation

      Authors: C.Chenot, J.Bobin and J. Rapin Journal: IEEE SPL  Year: Nov. 2015 Download: IEEE Arxiv Abstract Blind source separation is a widely used technique to analyze multichannel data. In many real-world applications, its results can be significantly hampered by the presence of unknown outliers. In this paper, a novel algorithm …
  • LOFAR Sparse Image Reconstruction

    LOFAR Sparse Image Reconstruction

      Authors: H. Garsden, J. N. Girard, J. L. Starck Journal: A&A Year: 2015 Download: ADS | arXiv   Abstract Context. The LOw Frequency ARray (LOFAR) radio telescope is a giant digital phased array interferometer with multiple antennas distributed in Europe. It provides discrete sets of Fourier components of the sky …
  • Super-resolution method using sparse regularization for point-spread function recovery

    Super-resolution method using sparse regularization for point-spread function recovery

      Authors: F. Ngolè Mboula, J-L. Starck, S. Ronayette, K. Okumura, J. Amiaux Journal: A&A Year: 2015 Download: ADS | arXiv   Abstract In large-scale spatial surveys, such as the forthcoming ESA Euclid mission, images may be undersampled due to the optical sensors sizes. Therefore, one may consider using a super-resolution …
  • The C-Band All Sky Survey: Separation of Diffuse Galactic Emissions at 5 GHz

    The C-Band All Sky Survey: Separation of Diffuse Galactic Emissions at 5 GHz

      Authors: M.O. Irfan, C. Dickinson, R.D. Davies, et al.     Journal: MNRAS Year: 2015 Download: ADS | arXiv Abstract We present an analysis of the diffuse emission at 5 GHz in the first quadrant of the Galactic plane using two months of preliminary intensity data taken with the C-Band …
  • A new model to predict weak-lensing peak counts I. Comparison with N-body Simulations

    A new model to predict weak-lensing peak counts I. Comparison with N-body Simulations

    Authors: C.-A. Lin, M. Kilbinger. Journal: A&A 576, A24 Year: 2015 Download: ADS | arXiv   Abstract Weak-lensing peak counts has been shown to be a powerful tool for cosmology. It provides non-Gaussian information of large scale structures, complementary to second order statistics. We propose a new flexible method to predict …
  • SNIa detection in the SNLS photometric analysis using Morphological Component Analysis

    SNIa detection in the SNLS photometric analysis using Morphological Component Analysis

      Authors: A. Möller, V. Ruhlmann-Kleider, F. Lanusse, J. Neveu, N. Palanque-Delabrouille, J.-L. Starck Journal: JCAP Year: 2015 Download: ADS | arXiv Abstract Detection of supernovae and, more generally, of transient events in large surveys can provide numerous false detections.In the case of a deferred processing of survey images, this implies …
  • Effect of inhomogeneities on high precision measurements of cosmological distances

    Effect of inhomogeneities on high precision measurements of cosmological distances

      Authors: A. Peel, M. A. Troxel, M. Ishak Journal: PRD Year: 2014 Download: ADS | arXiv Abstract We study effects of inhomogeneities on distance measures in an exact relativistic Swiss-cheese model of the Universe, focusing on the distance modulus. The model has Λ CDM background dynamics, and the "holes" are …
  • Gap interpolation by inpainting methods : Application to Ground and Space-based Asteroseismic data

    Gap interpolation by inpainting methods : Application to Ground and Space-based Asteroseismic data

      Authors: S. Pires, S. Mathur, R. A. Garcia, J. Ballot, D. Stello, K. Sato Journal: Astronomy & Astrophysics Year: 2014 Download: ADS | arXiv Abstract In asteroseismology, the observed time series often suffers from incomplete time coverage due to gaps. The presence of periodic gaps may generate spurious peaks in …
  • Friction in Gravitational Waves: a test for early-time modified gravity

    Friction in Gravitational Waves: a test for early-time modified gravity

      Authors: Pettorino, V., Amendola, L. Journal: Physics Letters B Year: 2015 Download: ADS | arXiv Abstract Modified gravity theories predict in general a non standard equation for the propagation of gravitational waves. Here we discuss the impact of modified friction and speed of tensor modes on cosmic microwave polarization B modes. …
  • The Dark Energy Survey and operations: Year 1

    The Dark Energy Survey and operations: Year 1

    The Dark Energy Survey and operations: Year 1  Authors: H. T. Diehl, T. M. C. Abbott, J. Annis et al. Journal: Proceedings of the SPIE Year: 08/2014 Download: ADS The Dark Energy Survey and operations: Year 1 Abstract The Dark Energy Survey (DES) is a next generation optical survey aimed …
  • Are the halo occupation predictions consistent with large-scale galaxy clustering?

    Are the halo occupation predictions consistent with large-scale galaxy clustering?

    Are the halo occupation predictions consistent with large-scale galaxy clustering?  Authors: A. Pujol and E. Gaztañaga Journal: MNRAS  Year: 08/2014 Download: ADS|Arxiv Are the halo occupation predictions consistent with large-scale galaxy clustering? Abstract We study how well we can reconstruct the two-point clustering of galaxies on linear scales, as a …
  • A Variational Bayes Framework for Sparse Adaptive Estimation

    A Variational Bayes Framework for Sparse Adaptive Estimation

      Authors: K. E. Themelis, A. A. Rontogiannis, K. D. Koutroumbas Journal: IEEE Transactions on Signal Processing Year: 2014 Download: ieeexplore     Abstract Recently, a number of mostly l1-norm regularized least-squares-type deterministic algorithms have been proposed to address the problem of sparse adaptive signal estimation and system identification. From …
  • Impact on asteroseismic analyses of regular gaps in Kepler data

    Impact on asteroseismic analyses of regular gaps in Kepler data

      Authors: R.A. Garcıa, S. Mathur, S. Pires, et al. Journal: Astronomy & Astrophysics Year: 2014 Download: ADS | arXiv Abstract The NASA Kepler mission has observed more than 190,000 stars in the constellations of Cygnus and Lyra. Around 4 years of almost continuous ultra high-precision photometry have been obtained reaching …
  • Subhaloes gone Notts: the clustering properties of subhaloes

    Subhaloes gone Notts: the clustering properties of subhaloes

    Subhaloes gone Notts: the clustering properties of subhaloes  Authors: A. Pujol, E. Gaztañaga,  C. Giocoli et al. Journal: MNRAS  Year: 03/2014 Download: ADS|Arxiv Subhaloes gone Notts: the clustering properties of subhaloes Abstract We present a study of the substructure finder dependence of subhalo clustering in the Aquarius Simulation. We run 11 different …
  • The C-Band All-Sky Survey (C-BASS): design and implementation of the northern receiver

    The C-Band All-Sky Survey (C-BASS): design and implementation of the northern receiver

      Authors: O. G. King,  Michael E. Jones,  E. J. Blackhurst, et al.     Journal: MNRAS Year: 2014 Download: ADS | arXiv Abstract The C-Band All-Sky Survey (C-BASS) is a project to map the full sky in total intensity and linear polarization at 5 GHz. The northern component of the …
  • Darth Fader: Using wavelets to obtain accurate redshifts of spectra at very low signal-to-noise

    Darth Fader: Using wavelets to obtain accurate redshifts of spectra at very low signal-to-noise

      Authors: D. P. Machado, A. Leonard, J.-L. Starck, F. B. Abdalla, S. Jouvel Journal: A&A Year: 2013 Download: ADS | arXiv Abstract We present the DARTH FADER algorithm, a new wavelet-based method for estimating redshifts of galaxy spectra in spectral surveys that is particularly adept in the very low SNR …
  • Effect of model-dependent covariance matrix for studying Baryon Acoustic Oscillations

    Effect of model-dependent covariance matrix for studying Baryon Acoustic Oscillations

      Authors: A. Labatie, J.-L. Starck, M. Lachièze-Rey Journal: ApJ Year: 2012 Download: ADS | arXiv Abstract Large-scale structures in the Universe are a powerful tool to test cosmological models and constrain cosmological parameters. A particular feature of interest comes from Baryon Acoustic Oscillations (BAOs), which are sound waves traveling in the …
  • On the Unmixing of MeX/OMEGA Hyperspectral Data

    On the Unmixing of MeX/OMEGA Hyperspectral Data

      Authors: K. E. Themelis, F. Schmidt, O. Sykioti, A. A. Rontogiannis, K. D. Koutroumbas, I. A. Daglis Journal: Planetary and Space Science Year: 2012 Download: elsevier     Abstract This paper presents a comparative study of three different types of estimators used for supervised linear unmixing of two MEx/OMEGA …
  • Sparse component separation for accurate CMB map estimation

    Sparse component separation for accurate CMB map estimation

      Authors: J. Bobin, J. -L. Starck, F. Sureau, S. Basak Journal: A&A Year: 2012 Download: ADS | arXiv Abstract The Cosmological Microwave Background (CMB) is of premier importance for the cosmologists to study the birth of our universe. Unfortunately, most CMB experiments such as COBE, WMAP or Planck do not …
  • Wavelet analysis of baryon acoustic structures in the galaxy distribution

    Wavelet analysis of baryon acoustic structures in the galaxy distribution

      Authors: P. Arnalte-Mur, A. Labatie, N. Clerc, V. J. Martínez, J.-L. Starck, et al. Journal: A&A Year: 2012 Download: ADS | arXiv Abstract Baryon Acoustic Oscillations (BAO) are a feature imprinted in the density field by acoustic waves travelling in the plasma of the early universe. Their fixed scale can …
  • A Novel Hierarchical Bayesian Approach for Sparse Semi-Supervised Hyperspectral Unmixing

    A Novel Hierarchical Bayesian Approach for Sparse Semi-Supervised Hyperspectral Unmixing

      Authors: K. E. Themelis, A. A. Rontogiannis, K. D. Koutroumbas Journal: IEEE Transactions on Signal Processing Year: 2012 Download: ieeexplore     Abstract In this paper the problem of semisupervised hyperspectral unmixing is considered. More specifically, the unmixing process is formulated as a linear regression problem, where the abundance’s …
  • Galaxy clustering in the CFHTLS-Wide: the changing relationship between galaxies and haloes since z ~ 1.2

    Galaxy clustering in the CFHTLS-Wide: the changing relationship between galaxies and haloes since z ~ 1.2

      Authors: J. Coupon, M. Kilbinger, H. J. McCracken, et al. Journal: A&A Year: 2012 Download: ADS | arXiv Abstract We present a detailed investigation of the changing relationship between galaxies and the dark matter haloes they inhabit from z~1.2 to the present day. We do this by comparing precise galaxy …
  • Detecting Baryon Acoustic Oscillations

    Detecting Baryon Acoustic Oscillations

      Authors: A. Labatie, J.-L. Starck, M. Lachièze-Rey Journal: ApJ Year: 2012 Download: ADS | arXiv Abstract Baryon Acoustic Oscillations are a feature imprinted in the galaxy distribution by acoustic waves traveling in the plasma of the early universe. Their detection at the expected scale in large-scale structures strongly supports current cosmological …
  • CMB map restoration

    CMB map restoration

      Authors: J. Bobin, J. -L. Starck, F. Sureau, J. Fadili Journal: Advances in Astronomy Year: 2011 Download: ADS | arXiv Abstract Estimating the cosmological microwave background is of utmost importance for cosmology. However, its estimation from full-sky surveys such as WMAP or more recently Planck is challenging: CMB maps are …
  • Friends-of-Friends Groups and Clusters in the 2SLAQ Catalogue

    Friends-of-Friends Groups and Clusters in the 2SLAQ Catalogue

      Authors: S. Farrens, F.B. Abdalla, E.S. Cypriano, C. Sabiu, C. Blake Journal: MNRAS Year: 2011 Download: ADS | arXiv Abstract We present a catalogue of galaxy groups and clusters selected using a friends-of-friends (FoF) algorithm with a dynamic linking length from the 2dF-SDSS LRG and QSO (2SLAQ) luminous red galaxy …
  • Uncertainty in 2-point correlation function estimators and BAO detection in SDSS DR7

    Uncertainty in 2-point correlation function estimators and BAO detection in SDSS DR7

      Authors: A. Labatie, J-L. Starck, M. Lachièze-Rey, P. Arnalte-Mur Journal: arXiv Year: 2010 Download: ADS | arXiv Abstract We study the uncertainty in different two-point correlation function (2PCF) estimators in currently available galaxy surveys. This is motivated by the active subject of using the baryon acoustic oscillations (BAOs) feature in the …
  • Reduced-shear power spectrum

    Reduced-shear power spectrum

    Fitting formulae of the reduced-shear power spectrum for weak lensing Reference Martin Kilbinger, 2010, arXiv:1004.3493 Description We provide fitting formulae for the reduced-shear power-spectrum correction which is third-order in the lensing potential. This correction reaches up to 10% of the total lensing spectrum. Higher-order correction terms are one order of …
  • Optimes E-/B-mode decomposition

    Optimes E-/B-mode decomposition

    A new cosmic shear function: Optimised E-/B-mode decomposition on a finite interval Reference Liping Fu, Martin Kilbinger, 2009, arXiv:0907.0795 Description We have introduced a new cosmic shear statistic which decomposes the shear correlation into E- and B-modes on a finite angular interval. The new function is calculated by integrating the …
  • Multi-scale morphology of the galaxy distribution

    Multi-scale morphology of the galaxy distribution

      Authors: E. Saar, V. J. Martinez, J-L. Starck, D. L. Donoho Journal: MNRAS Year: 2007 Download: ADS | arXiv Abstract Many statistical methods have been proposed in the last years for analyzing the spatial distribution of galaxies. Very few of them, however, can handle properly the border effects of complex …