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A statistical study on hot flow anomaly current sheets
Zhao, L. L.; Zhang, H.; Zong, Q. -G.
Hot flow anomalies (HFAs) are phenomena frequently observed near Earth's bow shock and form when the interplanetary discontinuities interact with Earth's bow shock. We perform a statistical study to determine what kind of discontinuities are more efficient to generate HFAs. We use strict criteria to identify classic HFAs, excluding similar foresho…
Production of Sulfur Allotropes in Electron Irradiated Jupiter Trojans Ice Analogs
Ehlmann, Bethany L.; Brown, Michael E.; Choukroun, Mathieu +7 more
In this paper, we investigate sulfur chemistry in laboratory analogs of Jupiter Trojans and Kuiper Belt Objects (KBOs). Electron irradiation experiments of CH3OH-NH3-H2O and H2S-CH3OH-NH3-H2O ices were conducted to better understand the chemical differences between primor…
Disturbed galaxy clusters are more abundant in an X-ray volume-limited sample
Böhringer, Hans; Chon, Gayoung
X-ray observations of clusters of galaxies have been used to study the large-scale structure of our Universe and to test cosmological models. In such studies it is critical to understand the unique survey selection function correctly. In comparison to the cluster detection by the Sunyaev-Zel'dovich effect (SZE), it has been shown that X-ray observ…
An Interactive Multi-instrument Database of Solar Flares
Kosovichev, Alexander G.; Nita, Gelu M.; Sadykov, Viacheslav M. +1 more
Solar flares are complicated physical phenomena that are observable in a broad range of the electromagnetic spectrum, from radio waves to γ-rays. For a more comprehensive understanding of flares, it is necessary to perform a combined multi-wavelength analysis using observations from many satellites and ground-based observatories. For an efficient …
Discovery of a keV-X-ray excess in RX J1856.5-3754
Yoneyama, Tomokage; Hayashida, Kiyoshi; Nakajima, Hiroshi +2 more
RX J1856.5-3754 is the brightest and nearest (∼120 pc) source among thermally emitting isolated neutron stars. Its spectra observed with XMM-Newton and Chandra satellites are well-fitted with the two-temperature (kT∞ ∼ 32 and 63 eV) blackbody model. Fitting ten sets of the data from Suzaku XIS 0, XIS 1, XIS 3, and XMM-Newton EPIC-pn wit…
Statistics of the fractional polarization of extragalactic dusty sources in Planck HFI maps
Bonavera, L.; González-Nuevo, J.; Toffolatti, L. +2 more
We estimate the average fractional polarization at 143, 217 and 353 GHz of a sample of 4697 extragalactic dusty sources by applying stacking technique. The sample is selected from the second version of the Planck Catalogue of Compact Sources at 857 GHz, avoiding the region inside the Planck Galactic mask (fsky ∼ 60 per cent). We recover…
Sixteen years of X-ray monitoring of Sagittarius A*: Evidence for a decay of the faint flaring rate from 2013 August, 13 months before a rise in the bright flaring rate
Grosso, Nicolas; Mossoux, Enmanuelle
Context. X-ray flaring activity from the closest supermassive black hole Sagittarius A* (Sgr A*) located at the center of our Galaxy has been observed since 2000 October 26 thanks to the current generation of X-ray facilities. In a study of X-ray flaring activity from Sgr A* using Chandra and XMM-Newton public observations from 1999 to 2014 and Sw…
Photographic observations of Saturn's moons at the MAO NAS of Ukraine in 1961–1990
Andruk, V. M.; Pakuliak, L. K.; Yizhakevych, O. M.
A catalog of 1385 astrometric positions of Saturn's moons S2–S9 has been compiled with Tycho-2 as a reference frame from photographic observations obtained at the Main Astronomical Observatory, National Academy of Sciences of Ukraine, in 1961–1990. Astronegatives have been digitized with an Epson Expression 10000XL commercial scanner in 16-bit gra…
A multiwavelength observation and investigation of six infrared dark clouds
Zhang, Chuan-Peng; Li, Guang-Xing; Wang, Jun-Jie +2 more
Context. Infrared dark clouds (IRDCs) are ubiquitous in the Milky Way, yet they play a crucial role in breeding newly-formed stars.
Aims: With the aim of further understanding the dynamics, chemistry, and evolution of IRDCs, we carried out multiwavelength observations on a small sample.
Methods: We performed new observations with the IRA…
A test for skewed distributions of dark matter, and a possible detection in galaxy cluster Abell 3827
Massey, Richard; Taylor, Peter; Jauzac, Mathilde +4 more
Simulations of self-interacting dark matter predict that dark matter should lag behind galaxies during a collision. If the interaction is mediated by a high-mass force carrier, the distribution of dark matter can also develop asymmetric dark matter tails. To search for this asymmetry, we compute the gravitational lensing properties of a mass distr…