- Matrix-free large-scale Bayesian inference in cosmology
- Jasche, Jens; Lavaux, Guilhem
In this work we propose a new matrix-free implementation of the Wiener sampler which is traditionally applied to high-dimensional analysis when signal covariances are unknown. Specifically, the proposed method addresses the problem of jointly inferr …
- The impact of supersurvey modes on cosmological constraints from cosmic shear fields
- Carron, J.; Szapudi, I.
Owing to the mass-sheet degeneracy, cosmic shear maps do not probe directly the Fourier modes of the underlying mass distribution on scales comparable to the survey size and larger. To assess the corresponding effect on attainable cosmological param …
- No Time for Dead Time: Timing Analysis of Bright Black Hole Binaries with NuSTAR
- Bachetti, Matteo; Harrison, Fiona A.; Cook, Rick; Tomsick, John; Schmid, Christian; Grefenstette, Brian W.; Barret, Didier; Boggs, Steven E.; Christensen, Finn E.; Craig, William W.; Fabian, Andrew C.; Fürst, Felix; Gandhi, Poshak; Hailey, Charles J.; Kara, Erin; Maccarone, Thomas J.; Miller, Jon M.; Pottschmidt, Katja; Stern, Daniel; Uttley, Phil; Walton, Dominic J.; Wilms, Jörn; Zhang, William W.
Timing of high-count-rate sources with the NuSTAR Small Explorer Mission requires specialized analysis techniques. NuSTAR was primarily designed for spectroscopic observations of sources with relatively low count rates rather than for timing analysi …
- Polarization measurement analysis. II. Best estimators of polarization fraction and angle
- Montier, L.; Plaszczynski, S.; Levrier, F.; Tristram, M.; Alina, D.; Ristorcelli, I.; Bernard, J.-P.; Guillet, V.
With the forthcoming release of high precision polarization measurements, such as from the Planck satellite, it becomes critical to evaluate the performance of estimators for the polarization fraction and angle. These two physical quantities suffer …
- Polarization measurement analysis. I. Impact of the full covariance matrix on polarization fraction and angle measurements
- Montier, L.; Plaszczynski, S.; Levrier, F.; Tristram, M.; Alina, D.; Ristorcelli, I.; Bernard, J.-P.
With the forthcoming release of high precision polarization measurements, such as from the Planck satellite, the metrology of polarization needs to be improved. In particular, it is important to have full knowledge of the noise properties when estim …
- Hyper: Hybrid photometry and extraction routine
- Traficante, A.; Fuller, G. A.; Pineda, J. E.; Pezzuto, S.
We present a new hybrid photometry and extraction routine called Hyper. It is designed to do compact source photometry, allowing for varying spatial resolution and sensitivity in multi-wavelength surveys. Hyper combines multi-Gaussian fitting with a …
- Gap interpolation by inpainting methods: Application to ground and space-based asteroseismic data
- Pires, Sandrine; Mathur, Savita; García, Rafael A.; Ballot, Jérôme; Stello, Dennis; Sato, Kumiko
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 the power spectrum that limit the analysis of the data. Various methods have been dev …
- Gap interpolation by inpainting methods: Application to ground and space-based asteroseismic data
- Pires, Sandrine; Mathur, Savita; García, Rafael A.; Ballot, Jérôme; Stello, Dennis; Sato, Kumiko
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 the power spectrum that limit the analysis of the data. Various methods have been dev …
- Modeling the Transfer Function for the Dark Energy Survey
- Chang, C.; Busha, M. T.; Wechsler, R. H.; Refregier, A.; Amara, A.; Rykoff, E.; Becker, M. R.; Bruderer, C.; Gamper, L.; Leistedt, B.; Peiris, H.; Abbott, T.; Abdalla, F. B.; Balbinot, E.; Banerji, M.; Bernstein, R. A.; Bertin, E.; Brooks, D.; Carnero, A.; Desai, S.; da Costa, L. N.; Cunha, C. E.; Eifler, T.; Evrard, A. E.; Fausti Neto, A.; Gerdes, D.; Gruen, D.; James, D.; Kuehn, K.; Maia, M. A. G.; Makler, M.; Ogando, R.; Plazas, A.; Sanchez, E.; Santiago, B.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, C.; Soares-Santos, M.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Zuntz, J.
We present a forward-modeling simulation framework designed to model the data products from the Dark Energy Survey (DES). This forward-model process can be thought of as a transfer function—a mapping from cosmological/astronomical signals to the f …
- Multiscale Distilled Sensing: Astronomical source detection in long wavelength images
- Masias, M.; Lladó, X.; Peracaula, M.; Freixenet, J.
The increasing number of astronomical surveys in mid- and far-infrared, as well as in submillimetre and radio wavelengths, brings more difficulties to the already challenging task of detecting sources in an automatic way. These specific images are c …
- UNIMAP: a generalized least-squares map maker for Herschel data
- Piazzo, Lorenzo; Calzoletti, Luca; Faustini, Fabiana; Pestalozzi, Michele; Pezzuto, Stefano; Elia, Davide; di Giorgio, Anna; Molinari, Sergio
The Herschel space telescope hosts two infrared photometers having an unprecedented resolution, sensitivity and dynamic range. The map making, i.e. the formation of sky images from the instruments’ data, is critical for the full exploitation of the …
- IMFIT: A Fast, Flexible New Program for Astronomical Image Fitting
- Erwin, Peter
I describe a new, open-source astronomical image-fitting program called IMFIT, specialized for galaxies but potentially useful for other sources, which is fast, flexible, and highly extensible. A key characteristic of the program is an object-orient …
- Selection of Burst-like Transients and Stochastic Variables Using Multi-band Image Differencing in the PAN-STARRS1 Medium-deep Survey
- Kumar, S.; Gezari, S.; Heinis, S.; Chornock, R.; Berger, E.; Rest, A.; Huber, M. E.; Foley, R. J.; Narayan, G.; Marion, G. H.; Scolnic, D.; Soderberg, A.; Lawrence, A.; Stubbs, C. W.; Kirshner, R. P.; Riess, A. G.; Smartt, S. J.; Smith, K.; Wood-Vasey, W. M.; Burgett, W. S.; Chambers, K. C.; Flewelling, H.; Kaiser, N.; Metcalfe, N.; Price, P. A.; Tonry, J. L.; Wainscoat, R. J.
We present a novel method for the light-curve characterization of Pan-STARRS1 Medium Deep Survey (PS1 MDS) extragalactic sources into stochastic variables (SVs) and burst-like (BL) transients, using multi-band image-differencing time-series data. We …
- Calibration of Semi-analytic Models of Galaxy Formation Using Particle Swarm Optimization
- Ruiz, Andrés N.; Cora, Sofía A.; Padilla, Nelson D.; Domínguez, Mariano J.; Vega-Martínez, Cristian A.; Tecce, Tomás E.; Orsi, Álvaro; Yaryura, Yamila; García Lambas, Diego; Gargiulo, Ignacio D.; Muñoz Arancibia, Alejandra M.
We present a fast and accurate method to select an optimal set of parameters in semi-analytic models of galaxy formation and evolution (SAMs). Our approach compares the results of a model against a set of observables applying a stochastic technique …
- A Common Stochastic Process Rules Gamma-ray Burst Prompt Emission and X-ray Flares
- Guidorzi, C.; Dichiara, S.; Frontera, F.; Margutti, R.; Baldeschi, A.; Amati, L.
Prompt γ-ray and early X-ray afterglow emissions in gamma-ray bursts (GRBs) are characterized by a bursty behavior and are often interspersed with long quiescent times. There is compelling evidence that X-ray flares are linked to prompt γ-rays. Ho …
- Bayesian Investigation of Isochrone Consistency Using the Old Open Cluster NGC 188
- Hills, Shane; von Hippel, Ted; Courteau, Stéphane; Geller, Aaron M.
This paper provides a detailed comparison of the differences in parameters derived for a star cluster from its color-magnitude diagrams (CMDs) depending on the filters and models used. We examine the consistency and reliability of fitting three wide …
- Uncertainties in asteroseismic grid-based estimates of stellar ages. SCEPtER: Stellar CharactEristics Pisa Estimation gRid
- Valle, G.; Dell’Omodarme, M.; Prada Moroni, P. G.; Degl’Innocenti, S.
Context. Stellar age determination by means of grid-based techniques that adopt asteroseismic constraints is a well established method nowadays. However some theoretical aspects of the systematic and statistical errors affecting these age estimates …
- Non-extensive statistical analysis of meteor showers and lunar flashes
- Betzler, A. S.; Borges, E. P.
The distribution of meteor magnitudes is usually supposed to be described by power laws. However, this relationship is not able to model the whole data set, and the parameters are considered to be dependent on the magnitude intervals. We adopt a sta …
- Blind foreground subtraction for intensity mapping experiments
- Alonso, David; Bull, Philip; Ferreira, Pedro G.; Santos, Mário G.
We make use of a large set of fast simulations of an intensity mapping experiment with characteristics similar to those expected of the Square Kilometre Array in order to study the viability and limits of blind foreground subtraction techniques. In …
- Local variance asymmetries in Planck temperature anisotropy maps
- Adhikari, Saroj
Recently, it was shown that local variance maps of temperature anisotropy are simple and useful tools for the study of large-scale hemispherical power asymmetry. This was done by studying the distribution of dipoles of the local variance maps. In th …