Search Publications
RCW 120: a possible case of hit and run, elucidated by multitemperature dust mapping
Marsh, K. A.; Whitworth, A. P.
We present resolution-enhanced images of warm dust at multiple temperatures and opacity index values in the star-forming bubble/H II region, RCW 120. The image set, representing a four-dimensional hypercube of differential column density, was obtained using our Bayesian procedure, PPMAP. The cool peripheral material (∼16-22 K) exhibits ragged clum…
The Fe Line Flux Ratio as a Diagnostic of the Maximum Temperature and the White Dwarf Mass of Cataclysmic Variables
Xu, Xiao-jie; Yu, Zhuo-li; Li, Xiang-dong
The flux ratio of Fe XXVI-Lyα to Fe XXV-Heα lines (I 7.0/I 6.7) is a sensitive indicator of the maximum temperature (T max), and therefore the mass of white dwarf stars (M WD) in cataclysmic variables (CVs). To examine and calibrate the theoretical I 7.0/I 6.7-T max-M
A Versatile and Accurate Method for Halo Mass Determination from Phase-space Distribution of Satellite Galaxies
Wang, Wenting; Han, Jiaxin; Li, Zhao-Zhou +2 more
We propose a versatile and accurate method to estimate the halo mass and concentration from the kinematics of satellite galaxies. We construct the 6D phase-space distribution function of satellites from a cosmological simulation based on the similarity of internal dynamics for different halos. Within the Bayesian statistical framework, not only ca…
Improved Fourier modeling of gravity fields caused by polyhedral bodies: with applications to asteroid Bennu and comet 67P/Churyumov-Gerasimenko
Wu, Leyuan; Chen, Longwei; Wu, Bin +2 more
This paper presents an improved algorithm for the 2D and 3D Fourier forward modeling of gravity fields caused by polyhedral bodies with constant and exponential density distributions. Three modifications have been made to the Fourier forward algorithm introduced in a previous paper. First, vertex-based Fourier-domain expressions are used instead o…
MUSE unravels the ionisation and origin of metal-enriched absorbers in the gas halo of a z = 2.92 radio galaxy
Humphrey, A.; Villar-Martín, M.; De Breuck, C. +9 more
We have used the Multi-Unit Spectroscopic Explorer (MUSE) to study the circumgalactic medium (CGM) of a z = 2.92 radio galaxy, MRC 0943-242 by parametrising its emitting and absorbing gas. In both Lyα λ1216 and He II λ1640 lines, we observe emission with velocity shifts of Δv ≃ -1000 km s-1 from the systemic redshift of the galaxy. Thes…
XMM-Newton Detection and Spectrum of the Second Fastest Spinning Pulsar PSR J0952-0607
Ho, Wynn C. G.; Heinke, Craig O.; Chugunov, Andrey I.
With a spin frequency of 707 Hz, PSR J0952-0607 is the second fastest spinning pulsar known. It was discovered in radio by LOFAR in 2017 at an estimated distance of either 0.97 or 1.74 kpc and has a low-mass companion with a 6.42 hr orbital period. We report the discovery of the X-ray counterpart of PSR J0952-0607 using XMM-Newton. The X-ray spect…
Evolution of Coronal Mass Ejection Properties in the Inner Heliosphere: Prediction for the Solar Orbiter and Parker Solar Probe
Poedts, Stefaan; Lugaz, Noé; Al-Haddad, Nada +3 more
The evolution of the magnetic field and plasma quantities inside a coronal mass ejection (CME) with distance are known from statistical studies using data from 1 au monitors, planetary missions, Helios, and Ulysses. This does not cover the innermost heliosphere, below 0.29 au, where no data are yet publicly available. Here, we describe the evoluti…
Acceleration of protons and heavy ions to suprathermal energies during dipolarizations in the near-Earth magnetotail
Grigorenko, Elena E.; Kronberg, Elena A.; Daly, Patrick W. +2 more
In this work we present an analysis of the dynamics of suprathermal ions of different masses (H+, He+, O+) during prolonged dipolarizations in the near-Earth magnetotail (X>-17RE) according to Cluster/RAPID observations in 2001-2005. All dipolarizations from our database were associated with fast flow…
Chemical abundances of open clusters from high-resolution infrared spectra - I. NGC 6940
Sneden, C.; Pilachowski, C. A.; Mace, G. N. +8 more
We present near-infrared spectroscopic analysis of 12 red giant members of the Galactic open cluster NGC 6940. High-resolution (R ≃ 45 000) and high-signal-to-noise ratio (S/N > 100) near-infrared H- and K-band spectra were gathered with the Immersion Grating Infrared Spectrograph (IGRINS) on the 2.7-m Smith Telescope at McDonald Observatory. W…
Energetic Oxygen and Sulfur Charge States in the Outer Jovian Magnetosphere: Insights From the Cassini Jupiter Flyby
Wilson, R. J.; Krimigis, S. M.; Mitchell, D. G. +10 more
On 10 January 2001, Cassini briefly entered into the magnetosphere of Jupiter, en route to Saturn. During this excursion into the Jovian magnetosphere, the Cassini Magnetosphere Imaging Instrument/Charge-Energy-Mass Spectrometer detected oxygen and sulfur ions. While Charge-Energy-Mass Spectrometer can distinguish between oxygen and sulfur charge …