Search Publications
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…
Did the progenitor of SN 2011dh have a binary companion?★
Cenko, S. B.; Horesh, A.; Maund, J. R. +6 more
We present late-time Hubble Space Telescope ultraviolet (UV) and optical observations of the site of SN 2011dh in the galaxy M51, ∼1164 days post-explosion. At the supernova (SN) location, we observe a point source that is visible at all wavelengths, which is significantly fainter than the spectral energy distribution (SED) of the yellow supergian…
The dark matter haloes of moderate luminosity X-ray AGN as determined from weak gravitational lensing and host stellar masses
Schramm, Malte; Elvis, Martin; Leauthaud, Alexie +9 more
Understanding the relationship between galaxies hosting active galactic nuclei (AGN) and the dark matter haloes in which they reside is key to constraining how black hole fuelling is triggered and regulated. Previous efforts have relied on simple halo mass estimates inferred from clustering, weak gravitational lensing, or halo occupation distribut…
FIP Bias Evolution in a Decaying Active Region
Long, D. M.; van Driel-Gesztelyi, L.; Démoulin, P. +4 more
Solar coronal plasma composition is typically characterized by first ionization potential (FIP) bias. Using spectra obtained by Hinode’s EUV Imaging Spectrometer instrument, we present a series of large-scale, spatially resolved composition maps of active region (AR)11389. The composition maps show how FIP bias evolves within the decaying AR durin…