Search Publications
Are Ultra-faint Galaxies at z = 6-8 Responsible for Cosmic Reionization? Combined Constraints from the Hubble Frontier Fields Clusters and Parallels
Richard, Johan; Schaerer, Daniel; Kneib, Jean-Paul +8 more
We use deep Hubble Space Telescope imaging of the Frontier Fields to accurately measure the galaxy rest-frame ultraviolet luminosity function (UV LF) in the redshift range z ∼ 6-8. We combine observations in three lensing clusters, A2744, MACS 0416, and MACS 0717, and their associated parallel fields to select high-redshift dropout candidates. We …
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. III. A Quintuple Stellar Population in NGC 2808
Anderson, J.; Milone, A. P.; Marino, A. F. +9 more
In this study we present the first results from multi-wavelength Hubble Space Telescope (HST) observations of the Galactic globular cluster (GC) NGC 2808 as an extension of the Hubble Space Telescope UV Legacy Survey of Galactic GCs (GO-13297 and previous proprietary and HST archive data). Our analysis allowed us to disclose a multiple-stellar-pop…
The Light Curve of the Macronova Associated with the Long-Short Burst GRB 060614
Li, Xiang; Jin, Zhi-Ping; Covino, Stefano +3 more
The Swift-detected GRB 060614 was a unique burst that straddles an imaginary divide between long- and short-duration gamma-ray bursts (GRBs), and its physical origin has been heavily debated over the years. Recently, a distinct, very soft F814W-band excess at t∼ 13.6 days after the burst was identified in a joint-analysis of VLT and Hubble Space T…
Filament identification through mathematical morphology
Koch, Eric W.; Rosolowsky, Erik W.
We present a new algorithm for detecting filamentary structure FILFINDER. The algorithm uses the techniques of mathematical morphology for filament identification, presenting a complementary approach to current algorithms which use matched filtering or critical manifolds. Unlike other methods, FILFINDER identifies filaments over a wide dynamic ran…
Observing Inflationary Reheating
Ringeval, Christophe; Martin, Jérôme; Vennin, Vincent
Reheating is the epoch which connects inflation to the subsequent hot big-bang phase. Conceptually very important, this era is, however, observationally poorly known. We show that the current Planck satellite measurements of the cosmic microwave background (CMB) anisotropies constrain the kinematic properties of the reheating era for most of the i…
Discovery of a 3.5 keV line in the Galactic Centre and a critical look at the origin of the line across astronomical targets
Profumo, Stefano; Jeltema, Tesla
We examine the claimed excess X-ray line emission near 3.5 keV including both a new analysis of XMM-Newton observations of the Milky Way centre and a reanalysis of the data on M 31 and clusters. In no case do we find conclusive evidence for an excess. In the case of the Galactic Centre, we show that known plasma lines, including in particular K XV…
Hubble Frontier Fields First Complete Cluster Data: Faint Galaxies at z ~ 5-10 for UV Luminosity Functions and Cosmic Reionization
Ono, Yoshiaki; Ouchi, Masami; Shimasaku, Kazuhiro +3 more
We present comprehensive analyses of faint dropout galaxies up to z ~ 10 with the first full-depth data set of the A2744 lensing cluster and parallel fields observed by the Hubble Frontier Fields (HFF) program. We identify 54 dropouts at z ~ 5-10 in the HFF fields and enlarge the size of the z ~ 9 galaxy sample obtained to date. Although the numbe…
UVUDF: Ultraviolet Through Near-infrared Catalog and Photometric Redshifts of Galaxies in the Hubble Ultra Deep Field
Finkelstein, Steven L.; Ferguson, Henry C.; Giavalisco, Mauro +26 more
We present photometry and derived redshifts from up to eleven bandpasses for 9927 galaxies in the Hubble Ultra Deep field (UDF), covering an observed wavelength range from the near-ultraviolet (NUV) to the near-infrared (NIR) with Hubble Space Telescope observations. Our Wide Field Camera 3 (WFC3)/UV F225W, F275W, and F336W image mosaics from the …
Planck intermediate results. XXII. Frequency dependence of thermal emission from Galactic dust in intensity and polarization
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +177 more
Planck has mapped the intensity and polarization of the sky at microwave frequencies with unprecedented sensitivity. We use these data to characterize the frequency dependence of dust emission. We make use of the Planck 353 GHz I, Q, and U Stokes maps as dust templates, and cross-correlate them with the Planck and WMAP data at 12 frequencies from …
Introduction to special section on Origins and Properties of Kappa Distributions: Statistical Background and Properties of Kappa Distributions in Space Plasmas
Livadiotis, George
Empirical kappa distributions provide a straightforward replacement of the Maxwell distribution for systems out of thermal equilibrium such as space plasmas. Kappa distributions have become increasingly widespread across space physics with the number of relevant publications following, remarkably, an exponential growth rate. However, a breakthroug…