Adrian M. Price-Whelan

Astropy: A community Python package for astronomy

We present the first public version (v0.2) of the open-source and community-developed Python package, Astropy. This package provides core astronomy-related functionality to the community, including support for domain-specific file formats such as flexible image transport system (FITS) files, Virtual Observatory (VO) tables, and common ASCII table formats, unit and physical quantity conversions, physical constants specific to astronomy, celestial coordinate and time transformations, world coordinate system (WCS) support, generalized containers for representing gridded as well as tabular data, and a framework for cosmological transformations and conversions. Significant functionality is under active development, such as a model fitting framework, VO client and server tools, and aperture and point spread function (PSF) photometry tools. The core development team is actively making additions and enhancements to the current code base, and we encourage anyone interested to participate in the development of future Astropy versions.

The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Release 9 spectroscopic galaxy sample

We present a one per cent measurement of the cosmic distance scale from the detections of the baryon acoustic oscillations in the clustering of galaxies from the Baryon Oscillation Spectroscopic Survey (BOSS), which is part of the Sloan Digital Sky Survey III (SDSS-III). Our results come from the Data Release 11 (DR11) sample, containing nearly one million galaxies and covering approximately

IMPROVED BACKGROUND SUBTRACTION FOR THE SLOAN DIGITAL SKY SURVEY IMAGES

8\,500

A population of short-period variable quasars from PTF as supermassive black hole binary candidates

square degrees and the redshift range

Tidal Stream Morphology as an Indicator of Dark Matter Halo Geometry: The Case of Palomar 5

0.2<z<0.7

A reinterpretation of the Triangulum–Andromeda stellar clouds: a population of halo stars kicked out of the Galactic disc

. We also compare these results with those from the publicly released DR9 and DR10 samples. Assuming a concordance

The Nature and Orbit of the Ophiuchus Stream

\Lambda

Chaotic Dispersal of Tidal Debris

CDM cosmological model, the DR11 sample covers a volume of 13\,Gpc

Multiple periods in the variability of the supermassive black hole binary candidate quasar PG1302-102?

{}^3

The Joker: A custom Monte Carlo sampler for binary-star and exoplanet radial velocity data

and is the largest region of the Universe ever surveyed at this density. We measure the correlation function and power spectrum, including density-field reconstruction of the baryon acoustic oscillation (BAO) feature. The acoustic features are detected at a significance of over