Search Publications
A Study of the Earth-Affecting CMEs of Solar Cycle 24
Hess, Phillip; Zhang, Jie
Using in situ observations from the Advanced Composition Explorer (ACE), we have identified 70 Earth-affecting interplanetary coronal mass ejections (ICMEs) in Solar Cycle 24. Because of the unprecedented extent of heliospheric observations in Cycle 24 that has been achieved thanks to the Sun Earth Connection Coronal and Heliospheric Investigation…
Solar wind- and EUV-dependent models for the shapes of the Martian plasma boundaries based on Mars Express measurements
Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +1 more
The long operational life (2003-present) of Mars Express (MEX) has allowed the spacecraft to make plasma measurements in the Martian environment over a wide range of upstream conditions. We have analyzed ∼7000 MEX orbits, covering three orders of magnitude in solar wind dynamic pressure, with data from the on board Analyzer of Space Plasmas and En…
The redshift evolution of major merger triggering of luminous AGNs: a slight enhancement at z ∼ 2
Wild, Vivienne; Villforth, Carolin; Rowlands, Kate +3 more
Active galactic nuclei (AGNs), particularly the most luminous AGNs, are commonly assumed to be triggered through major mergers; however, observational evidence for this scenario is mixed. To investigate any influence of galaxy mergers on AGN triggering and luminosities through cosmic time, we present a sample of 106 luminous X-ray-selected type 1 …
Global observations of magnetospheric high-m poloidal waves during the 22 June 2015 magnetic storm
Russell, C. T.; Anderson, B. J.; Nakamura, R. +12 more
We report global observations of high-m poloidal waves during the recovery phase of the 22 June 2015 magnetic storm from a constellation of widely spaced satellites of five missions including Magnetospheric Multiscale (MMS), Van Allen Probes, Time History of Events and Macroscale Interactions during Substorm (THEMIS), Cluster, and Geostationary Op…
HST PanCET program: A Cloudy Atmosphere for the Promising JWST Target WASP-101b
Sanz-Forcada, J.; Ehrenreich, D.; Lecavelier des Etangs, A. +19 more
We present results from the first observations of the Hubble Space Telescope (HST) Panchromatic Comparative Exoplanet Treasury program for WASP-101b, a highly inflated hot Jupiter and one of the community targets proposed for the James Webb Space Telescope (JWST) Early Release Science (ERS) program. From a single HST Wide Field Camera 3 observatio…
Thick Disks in the Hubble Space Telescope Frontier Fields
Elmegreen, Bruce G.; Elmegreen, Debra Meloy; Tompkins, Brittany +1 more
Thick disk evolution is studied using edge-on galaxies in two Hubble Space Telescope Frontier Field Parallels. The galaxies were separated into 72 clumpy types and 35 spiral types with bulges. Perpendicular light profiles in F435W, F606W, and F814W (B, V, and I) passbands were measured at 1 pixel intervals along the major axes and fitted to sech
The Massive CO White Dwarf in the Symbiotic Recurrent Nova RS Ophiuchi
Mikołajewska, Joanna; Shara, Michael M.
If accreting white dwarfs (WDs) in binary systems are to produce type Ia supernovae (SNe Ia), they must grow to nearly the Chandrasekhar mass and ignite carbon burning. Proving conclusively that a WD has grown substantially since its birth is a challenging task. Slow accretion of hydrogen inevitably leads to the erosion, rather than the growth of …
Cold dark matter plus not-so-clumpy dark relics
Mena, Olga; Gariazzo, Stefano; Weniger, Christoph +2 more
Various particle physics models suggest that, besides the (nearly) cold dark matter that accounts for current observations, additional but sub-dominant dark relics might exist. These could be warm, hot, or even contribute as dark radiation. We present here a comprehensive study of two-component dark matter scenarios, where the first component is a…
Resolving galaxy cluster gas properties at z 1 with XMM-Newton and Chandra
Arnaud, M.; Pratt, G. W.; Bartalucci, I. +3 more
Massive, high-redshift, galaxy clusters are useful laboratories to test cosmological models and to probe structure formation and evolution, but observations are challenging due to cosmological dimming and angular distance effects. Here we present a pilot X-ray study of the five most massive (M500 > 5 × 1014M⊙), …
Star formation of far-IR AGN and non-AGN galaxies in the green valley: possible implication of AGN positive feedback
Pović, Mirjana; Mahoro, Antoine; Nkundabakura, Pheneas
In this paper we present the star formation properties of Isubaru ≤ 23 X-ray detected active galactic nucleus (AGN) and non-AGN galaxies in the green valley with far-infrared (FIR) emission, using data from the COSMOS field. We measured star formation rates (SFR) using FIR Herschel/PACS data and we observed the location of AGN and non-A…