512 citations · 1k across the 20 of their papers we have counts for
9 papers · 1 filter
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…
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…
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…
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…