512 citations · 1k across the 20 of their papers we have counts for
20 papers
PCAT-DE: Reconstructing point-like and diffuse signals in astronomical images using spatial and spectral information
Richard M. Feder, Victoria Butler, Tansu Daylan +5
Observational data from astronomical imaging surveys contain information about a variety of source populations and environments, and its complexity will increase substantially as t…
SARABANDE: 3/4 Point Correlation Functions with Fast Fourier Transforms
James Sunseri, Zachary Slepian, Stephen Portillo +3
We present a new package SARABANDE for measuring 3 & 4 Point Correlation Functions (3/4 PCFs) in time using Fast Fourier T…
Measurement of the Relativistic Sunyaev-Zeldovich Corrections in RX J1347.5-1145
Victoria Butler, Richard M. Feder, Tansu Daylan +8
We present a measurement of the relativistic corrections to the thermal Sunyaev-Zel'dovich (SZ) effect spectrum, the rSZ effect, toward the massive galaxy cluster RX J1347.5-1145 b…
Sifting Through the Static: Moving Object Detection in Difference Images
Hayden Smotherman, Andrew J. Connolly, J. Bryce Kalmbach +6
Trans-Neptunian Objects (TNOs) provide a window into the history of the Solar System, but they can be challenging to observe due to their distance from the Sun and relatively low b…
21cmVAE: A Very Accurate Emulator of the 21-cm Global Signal
Christian H. Bye, Stephen K. N. Portillo, Anastasia Fialkov
Considerable observational efforts are being dedicated to measuring the sky-averaged (global) 21-cm signal of neutral hydrogen from Cosmic Dawn and the Epoch of Reionization. Deriv…
Classification of Magnetohydrodynamic Simulations using Wavelet Scattering Transforms
Andrew K. Saydjari, Stephen K. N. Portillo, Zachary Slepian +3
The complex interplay of magnetohydrodynamics, gravity, and supersonic turbulence in the interstellar medium (ISM) introduces non-Gaussian structure that can complicate comparison…
The Catalogue for Astrophysical Turbulence Simulations (CATS)
B. Burkhart, S. Appel, S. Bialy +18
Turbulence is a key process in many fields of astrophysics. Advances in numerical simulations of fluids over the last several decades have revolutionized our understanding of turbu…
Sampling for Deep Learning Model Diagnosis (Technical Report)
Parmita Mehta, Stephen Portillo, Magdalena Balazinska +1
Deep learning (DL) models have achieved paradigm-changing performance in many fields with high dimensional data, such as images, audio, and text. However, the black-box nature of d…
Dimensionality Reduction of SDSS Spectra with Variational Autoencoders
Stephen K. N. Portillo, John K. Parejko, Jorge R. Vergara +1
High resolution galaxy spectra contain much information about galactic physics, but the high dimensionality of these spectra makes it difficult to fully utilize the information the…
Multiband Probabilistic Cataloging: A Joint Fitting Approach to Point Source Detection and Deblending
Richard M. Feder, Stephen K. N. Portillo, Tansu Daylan +1
Probabilistic cataloging (PCAT) outperforms traditional cataloging methods on single-band optical data in crowded fields (Portillo et al. 2017). We extend our work to multiple band…
Astro2020 Science White Paper: The Next Decade of Astroinformatics and Astrostatistics
A. Siemiginowska, G. Eadie, I. Czekala +49
Over the past century, major advances in astronomy and astrophysics have been largely driven by improvements in instrumentation and data collection. With the amassing of high quali…
Photometric Biases in Modern Surveys
Stephen K. N. Portillo, Joshua S. Speagle, Douglas P. Finkbeiner
Many surveys use maximum-likelihood (ML) methods to fit models when extracting photometry from images. We show these ML estimators systematically overestimate the flux as a functio…
Mapping Distances Across the Perseus Molecular Cloud Using CO Observations, Stellar Photometry, and Gaia DR2 Parallax Measurements
Catherine Zucker, Edward F. Schlafly, Joshua S. Speagle +4
We present a new technique to determine distances to major star-forming regions across the Perseus Molecular Cloud, using a combination of stellar photometry, astrometric data, and…
Developing the 3-Point Correlation Function For the Turbulent Interstellar Medium
Stephen K. N. Portillo, Zachary Slepian, Blakesley Burkhart +2
We present the first application of the angle-dependent 3-Point Correlation Function (3PCF) to the density fields magnetohydrodynamic (MHD) turbulence simulations intended to model…
Too hot to handle? Analytic solutions for massive neutrino or warm dark matter cosmologies
Zachary Slepian, Stephen KN Portillo
We obtain novel closed form solutions to the Friedmann equation for cosmological models containing a component whose equation of state is that of radiation at early times…
Improved Point Source Detection in Crowded Fields using Probabilistic Cataloging
Stephen K. N. Portillo, Benjamin C. G. Lee, Tansu Daylan +1
Cataloging is challenging in crowded fields because sources are extremely covariant with their neighbors and blending makes even the number of sources ambiguous. We present the fir…
A theoretical framework to predict the most likely ion path in particle imaging
Charles-Antoine Collins-Fekete, Lennart Volz, Stephen K. N. Portillo +2
In this work, a generic rigorous Bayesian formalism is introduced to predict the most likely path of any ion crossing a medium between two detection points. The path is predicted b…
Inference of Unresolved Point Sources At High Galactic Latitudes Using Probabilistic Catalogs
Tansu Daylan, Stephen K. N. Portillo, Douglas P. Finkbeiner
Detection of point sources in images is a fundamental operation in astrophysics, and is crucial for constraining population models of the underlying point sources or characterizing…
Sharper Fermi LAT Images: instrument response functions for an improved event selection
Stephen K. N. Portillo, Douglas P. Finkbeiner
The Large Area Telescope on the Fermi Gamma-ray Space Telescope has a point spread function with large tails, consisting of events affected by tracker ineffiencies, inactive volume…
The Characterization of the Gamma-Ray Signal from the Central Milky Way: A Compelling Case for Annihilating Dark Matter
Tansu Daylan, Douglas P. Finkbeiner, Dan Hooper +4
Past studies have identified a spatially extended excess of 1-3 GeV gamma rays from the region surrounding the Galactic Center, consistent with the emission expected from ann…