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Constraining C III] Emission in a Sample of Five Luminous z = 5.7 Galaxies
Siana, Brian; Fan, Xiaohui; Jiang, Linhua +6 more
Recent observations have suggested that the C III]λ 1907/1909 emission lines could be alternative diagnostic lines for galaxies in the reionization epoch. We use the F128N narrowband filter on the Hubble Space Telescope’s (HST) Wide Field Camera 3 (WFC3) to search for C III] emission in a sample of five galaxies at z = 5.7 in the Subaru Deep Field…
Near-Earth plasma sheet boundary dynamics during substorm dipolarization
Strangeway, Robert J.; Plaschke, Ferdinand; Russell, Christopher T. +29 more
We report on the large-scale evolution of dipolarization in the near-Earth plasma sheet during an intense (AL ~ ‑1000 nT) substorm on August 10, 2016, when multiple spacecraft at radial distances between 4 and 15 RE were present in the night-side magnetosphere. This global dipolarization consisted of multiple short-timescale (a couple o…
Rapid X-ray variability properties during the unusual very hard state in neutron-star low-mass X-ray binaries
Altamirano, D.; Degenaar, N.; Wijnands, R. +2 more
Here, we study the rapid X-ray variability (using XMM-Newton observations) of three neutron-star low-mass X-ray binaries (1RXS J180408.9-342058, EXO 1745-248 and IGR J18245-2452) during their recently proposed very hard spectral state. All our systems exhibit a strong to very strong noise component in their power density spectra (rms amplitudes ra…
Venus's winds and temperatures during the MESSENGER's flyby: An approximation to a three-dimensional instantaneous state of the atmosphere
Clancy, R. T.; Hueso, R.; Sánchez-Lavega, A. +14 more
Even though many missions have explored the Venus atmospheric circulation, its instantaneous state is poorly characterized. In situ measurements vertically sampling the atmosphere exist for limited locations and dates, while remote sensing observations provide only global averages of winds at altitudes of the clouds: 47, 60, and 70 km. We present …
Planck Lensing and Cosmic Infrared Background Cross-correlation with Fermi-LAT: Tracing Dark Matter Signals in the Gamma-ray Background
Cooray, Asantha; Feng, Chang; Keating, Brian
The extragalactic γ-ray background and its spatial anisotropy could potentially contain a signature of dark matter (DM) annihilation or particle decay. Astrophysical foregrounds, such as blazars and star-forming galaxies (SFGs), however, dominate the γ-ray background, precluding an easy detection of the signal associated with the DM annihilation o…
Planck limits on non-canonical generalizations of large-field inflation models
Stein, Nina K.; Kinney, William H.
In this paper, we consider two case examples of Dirac-Born-Infeld (DBI) generalizations of canonical large-field inflation models, characterized by a reduced sound speed, cS < 1. The reduced speed of sound lowers the tensor-scalar ratio, improving the fit of the models to the data, but increases the equilateral-mode non-Gaussianity, …
Towards the origin of the radio emission in AR Scorpii, the first radio-pulsing white dwarf binary
Marsh, T. R.; Marcote, B.; Stanway, E. R. +2 more
Context. The binary system AR Sco contains an M star and the only known radio-pulsing white dwarf. The system shows emission from radio to X-rays, likely dominated by synchrotron radiation. The mechanism that produces most of this emission remains unclear. Two competing scenarios have been proposed: collimated outflows, and direct interaction betw…
A systematic analysis of the XMM-Newton background: IV. Origin of the unfocused and focused components
Tiengo, A.; Rossetti, M.; Moretti, A. +6 more
We show the results obtained in the FP7 European program EXTraS and in the ESA R&D ATHENA activity AREMBES aimed at a deeper understanding of the XMM-Newton background to better design the ATHENA mission. Thanks to an analysis of the full EPIC archive coupled to the information obtained by the Radiation Monitor we show the cosmic ray origin of…
Limits to the presence of transiting circumbinary planets in CoRoT Data
Csizmadia, Sz.; Cabrera, J.; Klagyivik, P. +2 more
Aims: During its flight phase, from 2007-2012, the CoRoT mission delivered light curves for over 2000 eclipsing binaries. Data from the Kepler mission have proven the existence of several transiting circumbinary planets. While light curves from CoRoT typically have lower precision and shorter coverage, the number of CoRoT targets is similar t…
Swift J164449.3+573451 and Swift J2058.4+0516: Black hole mass estimates for tidal disruption event sources
Titarchuk, Lev; Seifina, Elena; Virgilli, Enrico
A tidal disruption event (TDE) is an astronomical phenomenon in which a previously dormant black hole (BH) destroys a star passing too close to its central part. We analyzed the flaring episode detected from the TDE sources, Swift J164449.3+573451 and Swift J2058.4+0516 (hereafter Swift J1644+57 and Swift J2058+05, respectively) using RXTE, Swift …