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Molecular Outflows in Local ULIRGs: Energetics from Multitransition OH Analysis
Sturm, E.; Veilleux, S.; Farrah, D. +11 more
We report on the energetics of molecular outflows in 14 local ultraluminous infrared galaxies (ULIRGs) that show unambiguous outflow signatures (P Cygni profiles or high-velocity absorption wings) in the far-infrared lines of OH measured with the Herschel/PACS spectrometer. All sample galaxies are gas-rich mergers at various stages of the merging …
Sedimentological evidence for a deltaic origin of the western fan deposit in Jezero crater, Mars and implications for future exploration
Mustard, John F.; Goudge, Timothy A.; Head, James W. +2 more
We examine the stratigraphic architecture and mineralogy of the western fan deposit in the Jezero crater paleolake on Mars to reassess whether this fan formed as a delta in a standing body of water, as opposed to by alluvial or debris flow processes. Analysis of topography and images reveals that the stratigraphically lowest layers within the fan …
The response of relativistic outflowing gas to the inner accretion disk of a black hole
Fabian, Andrew C.; Reynolds, Christopher S.; Middleton, Matthew J. +21 more
The brightness of an active galactic nucleus is set by the gas falling onto it from the galaxy, and the gas infall rate is regulated by the brightness of the active galactic nucleus; this feedback loop is the process by which supermassive black holes in the centres of galaxies may moderate the growth of their hosts. Gas outflows (in the form of di…
Extensive Globular Cluster Systems Associated with Ultra Diffuse Galaxies in the Coma Cluster
Mowla, Lamiya; van Dokkum, Pieter; Romanowsky, Aaron J. +7 more
We present Hubble Space Telescope (HST) imaging of two ultra diffuse galaxies (UDGs) with measured stellar velocity dispersions in the Coma cluster. The galaxies, Dragonfly 44 and DFX1, have effective radii of 4.7 kpc and 3.5 kpc and velocity dispersions of {47}-6+8 km s-1 and {30}-7+7 km s
Statistical Studies of Solar White-light Flares and Comparisons with Superflares on Solar-type Stars
Notsu, Yuta; Maehara, Hiroyuki; Namekata, Kosuke +9 more
Recently, many superflares on solar-type stars have been discovered as white-light flares (WLFs). The statistical study found a correlation between their energies (E) and durations (τ): τ \propto {E}0.39, similar to those of solar hard/soft X-ray flares, τ \propto {E}0.2{--0.33}. This indicates a universal mechanism of energy…
A refined mass distribution of the cluster MACS J0416.1-2403 from a new large set of spectroscopic multiply lensed sources
Grillo, C.; Tozzi, P.; Balestra, I. +11 more
We report the spectroscopic confirmation of 22 new multiply lensed sources behind the Hubble Frontier Field (HFF) galaxy cluster MACS J0416.1-2403 (MACS 0416), using archival data from the Multi Unit Spectroscopic Explorer (MUSE) on the VLT. Combining with previous spectroscopic measurements of 15 other multiply imaged sources, we have obtained a …
A tale of two modes: neutrino free-streaming in the early universe
Knox, Lloyd; Pan, Zhen; Lancaster, Lachlan +1 more
We present updated constraints on the free-streaming nature of cosmological neutrinos from cosmic microwave background (CMB) temperature and polarization power spectra, baryonic acoustic oscillation data, and distance ladder measurements of the Hubble constant. Specifically, we consider a Fermi-like four-fermion interaction between massless neutri…
The interaction of ultra-low-frequency pc3-5 waves with charged particles in Earth's magnetosphere
Zong, Qiugang; Rankin, Robert; Zhou, Xuzhi
One of the most important issues in space physics is to identify the dominant processes that transfer energy from the solar wind to energetic particle populations in Earth's inner magnetosphere. Ultra-low-frequency (ULF) waves are an important consideration as they propagate electromagnetic energy over vast distances with little dissipation and in…
UCAC5: New Proper Motions Using Gaia DR1
Frouard, J.; Zacharias, N.; Finch, C.
New astrometric reductions of the US Naval Observatory CCD Astrograph Catalog (UCAC) all-sky observations were performed from first principles using the TGAS stars in the 8-11 mag range as the reference star catalog. Significant improvements in the astrometric solutions were obtained, and the UCAC5 catalog of mean positions at a mean epoch near 20…
A radiation transfer model for the Milky Way: I. Radiation fields and application to high-energy astrophysics★
Aharonian, F.; Yang, R.; Tuffs, R. J. +3 more
We present a solution for the ultraviolet - submillimetre (submm) interstellar radiation fields (ISRFs) of the Milky Way (MW), derived from modelling COBE, IRAS and Planck maps of the all-sky emission in the near-, mid-, far-infrared and submm. The analysis uses the axisymmetric radiative transfer model that we have previously implemented to model…