Search Publications
Metamorphosis of SN 2014C: Delayed Interaction between a Hydrogen Poor Core-collapse Supernova and a Nearby Circumstellar Shell
Fransson, C.; Challis, P.; Kirshner, R. P. +19 more
We present optical observations of supernova SN 2014C, which underwent an unprecedented slow metamorphosis from H-poor type Ib to H-rich type IIn over the course of one year. The observed spectroscopic evolution is consistent with the supernova having exploded in a cavity before encountering a massive shell of the progenitor star’s stripped hydrog…
Large-scale filaments associated with Milky Way spiral arms
Ginsburg, Adam; Wang, Ke; Testi, Leonardo +3 more
The ubiquity of filamentary structure at various scales throughout the Galaxy has triggered a renewed interest in their formation, evolution, and role in star formation. The largest filaments can reach up to Galactic scale as part of the spiral arm structure. However, such large-scale filaments are hard to identify systematically due to limitation…
Large-scale Globally Propagating Coronal Waves
Warmuth, Alexander
Large-scale, globally propagating wave-like disturbances have been observed in the solar chromosphere and by inference in the corona since the 1960s. However, detailed analysis of these phenomena has only been conducted since the late 1990s. This was prompted by the availability of high-cadence coronal imaging data from numerous spaced-based instr…
Suppression of Star Formation in NGC 1266
Meier, David S.; Chang, Philip; Martín, Sergio +11 more
NGC 1266 is a nearby lenticular galaxy that harbors a massive outflow of molecular gas powered by the mechanical energy of an active galactic nucleus (AGN). It has been speculated that such outflows hinder star formation (SF) in their host galaxies, providing a form of feedback to the process of galaxy formation. Previous studies, however, indicat…
Constraint on neutrino masses from SDSS-III/BOSS Lyα forest and other cosmological probes
Ross, Nicholas P.; Borde, Arnaud; Palanque-Delabrouille, Nathalie +11 more
We present constraints on the parameters of the ΛCDM cosmological model in the presence of massive neutrinos, using the one-dimensional Lyα forest power spectrum obtained with the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey (SDSS) by Palanque-Delabrouille et al. [1], complemented by additional cosmological probes…
Non-detection of X-ray emission from sterile neutrinos in stacked galaxy spectra
Bregman, Joel N.; Churazov, Eugene; Anderson, Michael E.
We conduct a comprehensive search for X-ray emission lines from sterile neutrino dark matter, motivated by recent claims of unidentified emission lines in the stacked X-ray spectra of galaxy clusters and the centres of the Milky Way and M31. Since the claimed emission lines lie around 3.5 keV, we focus on galaxies and galaxy groups (masking the ce…
First Frontier Field Constraints on the Cosmic Star Formation Rate Density at z ∼ 10—The Impact of Lensing Shear on Completeness of High-redshift Galaxy Samples
Trenti, M.; Oesch, P. A.; Bouwens, R. J. +5 more
We search the complete Hubble Frontier Field data set of Abell 2744 and its parallel field for z∼ 10 sources to further refine the evolution of the cosmic star formation rate density (SFRD) between z∼ 8 and z∼ 10. We independently confirm two images of the recently discovered triply imaged z∼ 9.8 source by Zitrin et al. and set an upper limit for …
Studying the YMC population of M83: how long clusters remain embedded, their interaction with the ISM and implications for GC formation theories
Bastian, N.; Ryon, J. E.; Adamo, A. +4 more
The study of young massive clusters can provide key information for the formation of globular clusters, as they are often considered analogues. A currently unanswered question in this field is how long these massive clusters remain embedded in their natal gas, with important implications for the formation of multiple populations that have been use…
The Confined X-class Flares of Solar Active Region 2192
Temmer, M.; Veronig, A. M.; Su, Y. +1 more
The unusually large active region (AR) NOAA 2192, observed in 2014 October, was outstanding in its productivity of major two-ribbon flares without coronal mass ejections. On a large scale, a predominantly north-south oriented magnetic system of arcade fields served as a strong top and lateral confinement for a series of large two-ribbon flares ori…
The exceptionally powerful TeV γ-ray emitters in the Large Magellanic Cloud
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +226 more
The Large Magellanic Cloud, a satellite galaxy of the Milky Way, has been observed with the High Energy Stereoscopic System (H.E.S.S.) above an energy of 100 billion electron volts for a deep exposure of 210 hours. Three sources of different types were detected: the pulsar wind nebula of the most energetic pulsar known, N 157B; the radio-loud supe…