Search Publications
The Panchromatic Hubble Andromeda Treasury. X. Ultraviolet to Infrared Photometry of 117 Million Equidistant Stars
Bell, Eric F.; Monachesi, Antonela; Dolphin, Andrew E. +16 more
We have measured stellar photometry with the Hubble Space Telescope Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys in near ultraviolet (F275W, F336W), optical (F475W, F814W), and near infrared (F110W, F160W) bands for 117 million resolved stars in M31. As part of the Panchromatic Hubble Andromeda Treasury survey, we measured photometry…
The Second Fermi GBM Gamma-Ray Burst Catalog: The First Four Years
Collazzi, Andrew C.; Goldstein, Adam; Preece, Robert D. +30 more
This is the second of a series of catalogs of gamma-ray bursts (GRBs) observed with the Fermi Gamma-ray Burst Monitor (GBM). It extends the first two-year catalog by two more years, resulting in an overall list of 953 GBM triggered GRBs. The intention of the GBM GRB catalog is to provide information to the community on the most important observabl…
The Third Gravitational Lensing Accuracy Testing (GREAT3) Challenge Handbook
Schrabback, Tim; Miyatake, Hironao; Leauthaud, Alexie +28 more
The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge is the third in a series of image analysis challenges, with a goal of testing and facilitating the development of methods for analyzing astronomical images that will be used to measure weak gravitational lensing. This measurement requires extremely precise estimation of very small gal…
1SXPS: A Deep Swift X-Ray Telescope Point Source Catalog with Light Curves and Spectra
Tagliaferri, G.; Gehrels, N.; Pagani, C. +9 more
We present the 1SXPS (Swift-XRT point source) catalog of 151,524 X-ray point sources detected by the Swift-XRT in 8 yr of operation. The catalog covers 1905 deg2 distributed approximately uniformly on the sky. We analyze the data in two ways. First we consider all observations individually, for which we have a typical sensitivity of ~3 …
The Herschel Stripe 82 Survey (HerS): Maps and Early Catalog
Doré, O.; Scott, D.; Jogee, S. +36 more
We present the first set of maps and band-merged catalog from the Herschel Stripe 82 Survey (HerS). Observations at 250, 350, and 500 µm were taken with the Spectral and Photometric Imaging Receiver instrument aboard the Herschel Space Observatory. HerS covers 79 deg2 along the SDSS Stripe 82 to an average depth of 13.0, 12.9, and…
X-Ray Emission from Magnetic Massive Stars
Wade, Gregg A.; Nazé, Yaël; ud-Doula, Asif +4 more
Magnetically confined winds of early-type stars are expected to be sources of bright and hard X-rays. To clarify the systematics of the observed X-ray properties, we have analyzed a large series of Chandra and XMM-Newton observations, corresponding to all available exposures of known massive magnetic stars (over 100 exposures covering ~60% of star…
The Properties of Low Redshift Intergalactic O VI Absorbers Determined from High S/N Observations of 14 QSOs with the Cosmic Origins Spectrograph
Savage, B. D.; Wakker, B. P.; Stocke, J. T. +4 more
We report on the observed properties of the plasma revealed through high signal-to-noise observations of 54 intervening O VI absorption systems containing 85 O VI and 133 H I components in a blind survey of 14 QSOs observed at ~18 km s-1 resolution with the Cosmic Origins Spectrograph over a redshift path of 3.52 at z < 0.5. Simple s…
Improved Ni I log(gf) Values and Abundance Determinations in the Photospheres of the Sun and Metal-poor Star HD 84937
Sneden, C.; Wood, M. P.; Lawler, J. E. +1 more
Atomic transition probability measurements for 371 Ni I lines in the UV through near-IR are reported. Branching fractions from data recorded using a Fourier transform spectrometer and a new echelle spectrograph are combined with published radiative lifetimes to determine these transition probabilities. Generally good agreement is found in comparis…
Warm Breeze from the Starboard Bow: a New Population of Neutral Helium in the Heliosphere
Wurz, P.; McComas, D. J.; Fuselier, S. A. +9 more
We investigate the signals from neutral helium atoms observed in situ from Earth orbit in 2010 by the Interstellar Boundary Explorer (IBEX). The full helium signal observed during the 2010 observation season can be explained as a superposition of pristine neutral interstellar He gas and an additional population of neutral helium that we call the W…
The Absolute Calibration of the EUV Imaging Spectrometer on Hinode
Landi, Enrico; Warren, Harry P.; Ugarte-Urra, Ignacio
We investigate the absolute calibration of the EUV Imaging Spectrometer (EIS) on Hinode by comparing EIS full-disk mosaics with irradiance observations from the EUV Variability Experiment on the Solar Dynamics Observatory. We also use extended observations of the quiet corona above the limb combined with a simple differential emission measure mode…