Search Publications
Understanding the Twist Distribution Inside Magnetic Flux Ropes by Anatomizing an Interplanetary Magnetic Cloud
Zhang, Tielong; Wang, Yuming; Shen, Chenglong +6 more
Magnetic flux rope (MFR) is the core structure of the greatest eruptions, that is, the coronal mass ejections (CMEs), on the Sun, and magnetic clouds are posteruption MFRs in interplanetary space. There is a strong debate about whether or not a MFR exists prior to a CME and how the MFR forms/grows through magnetic reconnection during the eruption.…
A Comparison of the X-Ray Emission from Tidal Disruption Events with those of Active Galactic Nuclei
Ramirez-Ruiz, Enrico; Auchettl, Katie; Guillochon, James
One of the main challenges of current tidal disruption events (TDEs) studies is that emission arising from active galactic nucleus (AGN) activity may potentially mimic the expected X-ray emission of a TDE. Here we compare the X-ray properties of TDEs and AGNs to determine a set of characteristics that would allow us to discriminate between flares …
Widespread distribution of OH/H2O on the lunar surface inferred from spectral data
Edwards, Christopher S.; Bandfield, Joshua L.; Poston, Michael J. +1 more
Remote-sensing data from lunar orbiters have revealed spectral features consistent with the presence of OH or H2O on the lunar surface. Analyses of data from the Moon Mineralogy Mapper spectrometer onboard the Chandrayaan-1 spacecraft have suggested that OH/H2O is recycled on diurnal timescales and persists only at high latit…
Catastrophic disruptions as the origin of bilobate comets
Richardson, Derek C.; Jutzi, Martin; Michel, Patrick +3 more
Several comets observed at close range have bilobate shapes1, including comet 67P/Churyumov-Gerasimenko (67P/C-G), which was imaged by the European Space Agency's Rosetta mission2,3. Bilobate comets are thought to be primordial because they are rich in supervolatiles (for example, N2 and CO) and have a low bulk den…
Exploring cosmic origins with CORE: B-mode component separation
Boulanger, F.; Ashdown, M.; Baccigalupi, C. +114 more
We demonstrate that, for the baseline design of the CORE satellite mission, the polarized foregrounds can be controlled at the level required to allow the detection of the primordial cosmic microwave background (CMB) B-mode polarization with the desired accuracy at both reionization and recombination scales, for tensor-to-scalar ratio values of rg…
Major merging history in CANDELS. I. Evolution of the incidence of massive galaxy-galaxy pairs from z = 3 to z ∼ 0
Finkelstein, Steven L.; Barro, Guillermo; Pérez-González, Pablo G. +37 more
The rate of major galaxy-galaxy merging is theoretically predicted to steadily increase with redshift during the peak epoch of massive galaxy development (1 ≤ z ≤ 3). We use close-pair statistics to objectively study the incidence of massive galaxies (stellar M1 > 2 × 1010 M⊙) hosting major companions (1 ≤ M
Spatial Distribution of the Milky Way Hot Gaseous Halo Constrained by Suzaku X-Ray Observations
Nakashima, Shinya; Inoue, Yoshiyuki; Kataoka, Jun +3 more
The formation mechanism of the hot gaseous halo associated with the Milky Way is still under debate. We report new observational constraints on the gaseous halo using 107 lines of sight of the Suzaku X-ray observations at 75° < l < 285° and | b| > 15^\circ with a total exposure of 6.4 Ms. The gaseous halo spectra are represented by a sing…
Coronal Magnetic Structure of Earthbound CMEs and In Situ Comparison
Palmerio, E.; Möstl, C.; Kilpua, E. K. J. +6 more
Predicting the magnetic field within an Earth-directed coronal mass ejection (CME) well before its arrival at Earth is one of the most important issues in space weather research. In this article, we compare the intrinsic flux rope type, that is, the CME orientation and handedness during eruption, with the in situ flux rope type for 20 CME events t…
Discovery of Extended Main Sequence Turnoffs in Galactic Open Clusters
Di Criscienzo, M.; Balaguer-Núñez, L.; Milone, A. P. +5 more
The color-magnitude diagrams (CMDs) of Galactic open clusters are widely considered to be the prototypes of single stellar populations. By using photometry in ultraviolet and optical bands we discovered that the nearby young cluster NGC 6705 (M11) exhibits an extended main-sequence turnoff (eMSTO) and a broadened main sequence (MS). This is the fi…
Global Model of Plasmaspheric Hiss From Multiple Satellite Observations
Meredith, Nigel P.; Horne, Richard B.; Li, Wen +4 more
We present a global model of plasmaspheric hiss, using data from eight satellites, extending the coverage and improving the statistics of existing models. We use geomagnetic activity dependent templates to separate plasmaspheric hiss from chorus. In the region 22-14 magnetic local time (MLT) the boundary between plasmaspheric hiss and chorus moves…