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Multiwavelength observations of the transitional millisecond pulsar binary XSS J12270-4859
Belloni, T.; de Martino, D.; Rea, N. +7 more
We present an analysis of X-ray, ultraviolet and optical/near-IR photometric data of the transitional millisecond pulsar binary XSS J12270-4859, obtained at different epochs after the transition to a rotation-powered radio pulsar state. The observations, while confirming the large-amplitude orbital modulation found in previous studies after the st…
Chitah: Strong-gravitational-lens Hunter in Imaging Surveys
Marshall, Philip J.; Oguri, Masamune; Suyu, Sherry H. +5 more
Strong gravitationally lensed quasars provide powerful means to study galaxy evolution and cosmology. Current and upcoming imaging surveys will contain thousands of new lensed quasars, augmenting the existing sample by at least two orders of magnitude. To find such lens systems, we built a robot, Chitah, that hunts for lensed quasars by modeling t…
The radiative efficiency of a radiatively inefficient accretion flow
Messenger, C.; Patruno, A.; D'Angelo, C. R. +1 more
A recent joint XMM-Newton/Nuclear Spectroscopic Telescope Array (NuSTAR) observation of the accreting neutron star Cen X-4 (LX ∼ 1033 erg s-1) revealed a hard power-law component (Γ ∼ 1-1.5) with a relatively low cut-off energy (∼10 keV), suggesting bremsstrahlung emission. The physical requirements for bremsstrahl…
Detection of Quasar Feedback from the Thermal Sunyaev-Zel’dovich Effect in Planck
Anderson, Scott F.; Ruan, John J.; McQuinn, Matthew
Poorly understood feedback processes associated with highly luminous black hole accretion in quasars may dramatically affect the properties of their host galaxies. We search for the effect of quasar feedback on surrounding gas using Planck maps of the thermal Sunyaev-Zel’dovich effect (tSZ). By stacking tSZ Compton-y maps centered on the locations…
Large-scale dust jets in the coma of 67P/Churyumov-Gerasimenko as seen by the OSIRIS instrument onboard Rosetta
Jorda, L.; Lamy, P. L.; Lara, L. M. +54 more
Context. During the most recent perihelion passage in 2009 of comet 67P/Churyumov-Gerasimenko (67P), ground-based observations showed an anisotropic dust coma where jet-like features were detected at ~ 1.3 AU from the Sun. The current perihelion passage is exceptional as the Rosetta spacecraft is monitoring the nucleus activity since March 2014, w…
Star Cluster Properties in Two LEGUS Galaxies Computed with Stochastic Stellar Population Synthesis Models
Gouliermis, Dimitrios A.; Smith, Linda J.; Calzetti, Daniela +14 more
We investigate a novel Bayesian analysis method, based on the Stochastically Lighting Up Galaxies (slug) code, to derive the masses, ages, and extinctions of star clusters from integrated light photometry. Unlike many analysis methods, slug correctly accounts for incomplete initial mass function (IMF) sampling, and returns full posterior probabili…
Dust models post-Planck: constraining the far-infrared opacity of dust in the diffuse interstellar medium
Miville-Deschênes, M. -A.; Boulanger, F.; Aniano, G. +5 more
Aims: We compare the performance of several dust models in reproducing the dust spectral energy distribution (SED) per unit extinction in the diffuse interstellar medium (ISM). We use our results to constrain the variability of the optical properties of big grains in the diffuse ISM, as published by the Planck collaboration.
Methods: We …
Day-to-night transport in the Martian ionosphere: Implications from total electron content measurements
Wei, Y.; Galand, M.; Yelle, R. V. +2 more
The nightside Martian ionosphere is thought to be contributed by day-to-night transport and electron precipitation, of which the former has not been well studied. In this work, we evaluate the role of day-to-night transport based on the total electron content (TEC) measurements made by the Mars Advanced Radar for Subsurface and Ionospheric Soundin…
Slow electron phase space holes: Magnetotail observations
André, M.; Vaivads, A.; Khotyaintsev, Y. V. +1 more
We report multispacecraft observations of slow electrostatic solitary waves in the plasma sheet boundary layer. The electrostatic solitary waves are embedded in a region with field-aligned electron flows and are interpreted as electron phase space holes. We make unambiguous velocity and length estimates of the electron holes, vEH∼500 km…
Hubble Space Telescope Astrometry of the Procyon System
Schaefer, Gail H.; Nelan, Edmund P.; Bond, Howard E. +9 more
The nearby star Procyon is a visual binary containing the F5 IV-V subgiant Procyon A, orbited in a 40.84-year period by the faint DQZ white dwarf (WD) Procyon B. Using images obtained over two decades with the Hubble Space Telescope, and historical measurements back to the 19th century, we have determined precise orbital elements. Combined with me…