Search Publications
Forming One of the Most Massive Objects in the Universe: The Quadruple Merger in Abell 1758
O'Sullivan, E.; David, L.; Schellenberger, G. +2 more
The system A1758 is made up of two galaxy clusters, a more massive, northern cluster and a southern cluster. Both parts are undergoing major merger events at different stages. Although the mass of the merger constituents provides enough energy to produce visible shock fronts in the X-ray, none have been found to date. We present detailed temperatu…
Developing the Physical Understanding of Intermediate Polars: An X-Ray Study of TV Col and V2731 Oph
Mukai, K.; Lopes de Oliveira, R.
The X-rays in intermediate polars (IPs) originate in a compact region near the surface of a magnetic white dwarf (WD) and interact with the complex environment surrounding the emission region. Here we report a case study of two IPs, TV Col and V2731 Oph, with selected archival X-ray observations (NuSTAR, Swift, Suzaku, and XMM-Newton). For TV Col,…
Revealing a Highly Dynamic Cluster Core in Abell 1664 with Chandra
Baum, Stefi A.; O'Dea, Christopher P.; McNamara, Brian R. +11 more
We present new, deep (245 ks) Chandra observations of the galaxy cluster Abell 1664 (z = 0.1283). These images reveal rich structure, including elongation and accompanying compressions of the X-ray isophotes in the NE-SW direction, suggesting that the hot gas is sloshing in the gravitational potential. This sloshing has resulted in cold fronts, at…
High-drag Interstellar Objects and Galactic Dynamical Streams
Eubanks, T. M.
The nature of 1I/’Oumuamua (henceforth, 1I), the first interstellar object (ISO) known to pass through the solar system, remains mysterious. Feng & Jones noted that the incoming 1I velocity vector “at infinity” ({v}∞ ) is close to the motion of the Pleiades dynamical stream (or Local Association), and suggested that 1I is a young ob…
Properties of the Interstellar Medium along Sight Lines to Nearby Planet-hosting Stars
Redfield, Seth; Wood, Brian E.; Linsky, Jeffrey L. +2 more
We analyze the high-resolution ultraviolet spectra of three nearby exoplanet host stars (HD 192310, HD 9826, and HD 206860) to study interstellar properties along their lines of sight and to search for the presence of astrospheric absorption. Using the Hubble Space Telescope/Space Telescope Imaging Spectrograph spectra of the Lyα, Mg II, and Fe II…
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…
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…
Resolving the Interstellar Medium in Ultraluminous Infrared QSO Hosts with ALMA
Kohno, Kotaro; Daddi, Emanuele; Gao, Yu +8 more
We present ALMA observations of the CO(1-0) line and 3 mm continuum emission in eight ultraluminous infrared (IR) quasi-stellar objects (QSOs) at z = 0.06-0.19. All eight IR QSO hosts are clearly resolved in their CO molecular gas emission with a median source size of 3.2 kpc, and seven out of eight sources are detected in 3 mm continuum, which is…