Search Publications
DYNESTY: a dynamic nested sampling package for estimating Bayesian posteriors and evidences
Speagle, Joshua S.
We present DYNESTY, a public, open-source, PYTHON package to estimate Bayesian posteriors and evidences (marginal likelihoods) using the dynamic nested sampling methods developed by Higson et al. By adaptively allocating samples based on posterior structure, dynamic nested sampling has the benefits of Markov chain Monte Carlo (MCMC) algorithms tha…
The Pan-STARRS1 Database and Data Products
Price, P. A.; Rest, A.; Saglia, R. P. +36 more
This paper describes the organization of the database and the catalog data products from the Pan-STARRS1 3π Steradian Survey. The catalog data products are available in the form of an SQL-based relational database from MAST, the Mikulski Archive for Space Telescopes at STScI. The database is described in detail, including the construction of the d…
Painting a portrait of the Galactic disc with its stellar clusters
Castro-Ginard, A.; Jordi, C.; Casamiquela, L. +10 more
Context. The large astrometric and photometric survey performed by the Gaia mission allows for a panoptic view of the Galactic disc and its stellar cluster population. Hundreds of stellar clusters were only discovered after the latest Gaia data release (DR2) and have yet to be characterised.
Aims: Here we make use of the deep and homogeneous …
The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release
Brandt, W. N.; Pâris, Isabelle; Petitjean, Patrick +34 more
We present the final Sloan Digital Sky Survey IV (SDSS-IV) quasar catalog from Data Release 16 of the extended Baryon Oscillation Spectroscopic Survey (eBOSS). This catalog comprises the largest selection of spectroscopically confirmed quasars to date. The full catalog includes two subcatalogs (the current versions are DR16Q_v4 and DR16Q_Superset_…
APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
Bizyaev, Dmitry; Bovy, Jo; Cunha, Katia +20 more
The spectral analysis and data products in Data Release 16 (DR16; 2019 December) from the high-resolution near-infrared Apache Point Observatory Galactic Evolution Experiment (APOGEE)-2/Sloan Digital Sky Survey (SDSS)-IV survey are described. Compared to the previous APOGEE data release (DR14; 2017 July), APOGEE DR16 includes about 200,000 new ste…
A repeating fast radio burst source localized to a nearby spiral galaxy
Lazio, T. J. W.; Kirichenko, A. Yu.; Vanderlinde, K. +51 more
Fast radio bursts (FRBs) are brief, bright, extragalactic radio flashes1,2. Their physical origin remains unknown, but dozens of possible models have been postulated3. Some FRB sources exhibit repeat bursts4-7. Although over a hundred FRB sources have been discovered8, only four have been localized and a…
Calibration of the Tip of the Red Giant Branch
Madore, Barry F.; Freedman, Wendy L.; Lee, Myung Gyoon +6 more
The tip of the red giant branch (TRGB) method provides one of the most accurate and precise means of measuring the distances to nearby galaxies. Here we present a multi-wavelength, VIJHK absolute calibration of the TRGB based on observations of TRGB stars in the Large Magellanic Cloud (LMC), grounded on a geometric distance, determined by detached…
Evidence from the H3 Survey That the Stellar Halo Is Entirely Comprised of Substructure
Conroy, Charlie; Ting, Yuan-Sen; Cargile, Phillip A. +5 more
In the ΛCDM paradigm, the Galactic stellar halo is predicted to harbor the accreted debris of smaller systems. To identify these systems, the H3 Spectroscopic Survey, combined with Gaia, is gathering 6D phase-space and chemical information in the distant Galaxy. Here we present a comprehensive inventory of structure within 50 kpc from the Galactic…
Streams, Substructures, and the Early History of the Milky Way
Helmi, Amina
The advent of the second data release of the Gaia mission, in combination with data from large spectroscopic surveys, is revolutionizing our understanding of the Galaxy. Thanks to these transformational data sets and the knowledge accumulated thus far, a new, more mature picture of the evolution of the early Milky Way is currently emerging. Two of…
The SunPy Project: Open Source Development and Status of the Version 1.0 Core Package
Ryan, Daniel F.; Murray, Sophie A.; Ireland, Jack +32 more
The goal of the SunPy project is to facilitate and promote the use and development of community-led, free, and open source data analysis software for solar physics based on the scientific Python environment. The project achieves this goal by developing and maintaining the sunpy core package and supporting an ecosystem of affiliated packages. This …