- Low-rank approximations for large stationary covariance matrices, as used in the Bayesian and generalized-least-squares analysis of pulsar-timing data
- van Haasteren, Rutger; Vallisneri, Michele
Many data-analysis problems involve large dense matrices that describe the covariance of wide-sense stationary noise processes; the computational cost of inverting these matrices, or equivalently of solving linear systems that contain them, is often …
- The Bolocam Galactic Plane Survey. XII. Distance Catalog Expansion Using Kinematic Isolation of Dense Molecular Cloud Structures with 13CO(1-0)
- Ellsworth-Bowers, Timothy P.; Rosolowsky, Erik; Glenn, Jason; Ginsburg, Adam; Evans, Neal J., II; Battersby, Cara; Shirley, Yancy L.; Svoboda, Brian
We present an expanded distance catalog for 1710 molecular cloud structures identified in the Bolocam Galactic Plane Survey (BGPS) version 2, representing a nearly threefold increase over the previous BGPS distance catalog. We additionally present a …
- Fast Inversion of Solar Ca II Spectra
- Beck, C.; Choudhary, D. P.; Rezaei, R.; Louis, R. E.
We present a fast (Lt1 s per profile) inversion code for solar Ca II lines. The code uses an archive of spectra that are synthesized prior to the inversion under the assumption of local thermodynamic equilibrium (LTE). We show that it can be success …
- A Framework for Collaborative Review of Candidate Events in High Data Rate Streams: the V-Fastr Experiment as a Case Study
- Hart, Andrew F.; Cinquini, Luca; Khudikyan, Shakeh E.; Thompson, David R.; Mattmann, Chris A.; Wagstaff, Kiri; Lazio, Joseph; Jones, Dayton
“Fast radio transients” are defined here as bright millisecond pulses of radio-frequency energy. These short-duration pulses can be produced by known objects such as pulsars or potentially by more exotic objects such as evaporating black holes. …
- Inversion of stellar fundamental parameters from ESPaDOnS and Narval high-resolution spectra
- Paletou, F.; Böhm, T.; Watson, V.; Trouilhet, J.-F.
The general context of this study is the inversion of stellar fundamental parameters from high-resolution Echelle spectra. We aim at developing a fast and reliable tool for the post-processing of spectra produced by ESPaDOnS and Narval spectropolari …
- Wavelet analysis of CME, X-ray flare, and sunspot series
- Guedes, M. R. G.; Pereira, E. S.; Cecatto, J. R.
Context. Coronal mass ejections (CMEs) and solar flares are the most energetic transient phenomena taking place at the Sun. Together they are principally responsible for disturbances in outer geospace. Coronal mass ejections and solar flares are bel …
- A Novel Technique to Improve Photometry in Confused Images Using Graphs and Bayesian Priors
- Safarzadeh, Mohammadtaher; Ferguson, Henry C.; Lu, Yu; Inami, Hanae; Somerville, Rachel S.
We present a new technique for overcoming confusion noise in deep far-infrared Herschel space telescope images making use of prior information from shorter λ < 2 μm wavelengths. For the deepest images obtained by Herschel, the flux limit due to so …
- Split Bregman Method for Gravitational Wave Denoising
- Torres, Alejandro; Marquina, Antonio; Font, José A.; Ibáñez, José M.
This paper presents a progress report in our aim to develop a Total Variation algorithm for denoising of gravitational waves. These algorithms, are routinely employed in the context of image processing and they do not need any a priori information o …
- ANIMATING SAMPLES FROM GAUSSIAN DISTRIBUTIONS
- Philipp Hennig
The animations displayed below are animated samples from correlated Gaussian beliefs, following closed trajectories along equipotential lines of the probability distribution. They offer a more expressive view of the structure of samples from Gaussia …
- Visualizing the Universe: Using Modern Graphics Cards to Understand the Physical World
- F. Alexander Bogert, Nicholas Smith, and John Holdener,
- Visualizing Big Data in Astronomy: The Automated Movie Production Environment Distribution and Display (AMPED) Pipeline
- Eric M. De Jong
Storing, transporting, analyzing, and visualizing rapidly growing quantities of data is a significant challenge in astronomy. The Automated Movie Production Environment Distribution and Display (AMPED) Pipeline aims to enhance dataset usage th …
- Supporting Distributed, Collaborative Review and Classification of Fast Transient Events
- Andrew F. Hart, Luca Cinquini, Shakeh E. Khudikyan, David R. Thompson, Chris A. Mattmann, Kiri Wagstaff, Joseph Lazio, and Dayton L. Jones,
Open source software and machine learning help support a modern, high- throughput radio-astronomy experiment investigating fast transient events.
- Big Data Technologies at JPL
- Dayton L. Jones
SEPTEMBER 2014 67 Big Data Technologies at JPL Dayton L. Jones, NASA Jet Propulsion Laboratory The author summarizes recent work at the Jet Propulsion Laboratory in four technology areas needed for solving big data challenges: low-power signal …
- The Astrophysics Source Code Library: ascl.net
- Alice Allen, Lior Shamir, Peter Teuben,
Research in astronomy depends on software that often is not easily accessible to other researchers. The Astrophysics Source Code Library indexes this software and provides a way for scientists to find and cite it.
- High- Performance Computing of Self-Gravity for Small Solar System Bodies
- Daniel Frascarelli, Sergio Nesmachnow, and Gonzalo Tancredi
To study the evolution of small solar sys- tem bodies like asteroids and comets, a fast method is needed to compute the self- gravity of systems composed of millions of particles. A proposed fully parallel shared-memory algorithm for dense, self- gr …
- Denoising, deconvolving, and decomposing photon observations. Derivation of the D3PO algorithm
- Selig, Marco; Ensslin, Torsten A.
The analysis of astronomical images is a non-trivial task. The D3PO algorithm addresses the inference problem of denoising, deconvolving, and decomposing photon observations. Its primary goal is the simultaneous but individual reconstruction of the …
- Most 1.6 Earth-radius Planets are Not Rocky
- Rogers, Leslie A.
The Kepler mission, combined with ground-based radial velocity (RV) follow-up and dynamical analyses of transit timing variations, has revolutionized the observational constraints on sub-Neptune-sized planet compositions. The results of an extensive …
- Statistics of X-Ray Polarization Measurements
- Montgomery, C. G.; Swank, J. H.
The polarization of an X-ray beam that produces electrons with velocity components perpendicular to the beam generates an azimuthal distribution of the ejected electrons. We present methods for simulating and for analyzing the angular dependence of …
- 3D morphology of a random field from its 2D cross-section
- Makarenko, Irina; Fletcher, Andrew; Shukurov, Anvar
The two aspect ratios of randomly oriented triaxial ellipsoids (representing isosurfaces of an isotropic 3D random field) can be determined from a single 2D cross-section of their sample using the probability density function (PDF) of the filamentar …
- A metric space for Type Ia supernova spectra
- Sasdelli, Michele; Hillebrandt, W.; Aldering, G.; Antilogus, P.; Aragon, C.; Bailey, S.; Baltay, C.; Benitez-Herrera, S.; Bongard, S.; Buton, C.; Canto, A.; Cellier-Holzem, F.; Chen, J.; Childress, M.; Chotard, N.; Copin, Y.; Fakhouri, H. K.; Feindt, U.; Fink, M.; Fleury, M.; Fouchez, D.; Gangler, E.; Guy, J.; Ishida, E. E. O.; Kim, A. G.; Kowalski, M.; Kromer, M.; Lombardo, S.; Mazzali, P. A.; Nordin, J.; Pain, R.; Pécontal, E.; Pereira, R.; Perlmutter, S.; Rabinowitz, D.; Rigault, M.; Runge, K.; Saunders, C.; Scalzo, R.; Smadja, G.; Suzuki, N.; Tao, C.; Taubenberger, S.; Thomas, R. C.; Tilquin, A.; Weaver, B. A.
We develop a new framework for use in exploring Type Ia supernovae (SNe Ia) spectra. Combining principal component analysis (PCA) and partial least square (PLS) analysis we are able to establish correlations between the principal components (PCs) an …