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The Galaxy End Sequence
Smith, Matthew W. L.; Eales, Stephen; Ciesla, Laure +4 more
A common assumption is that galaxies fall in two distinct regions of a plot of specific star formation rate (SSFR) versus galaxy stellar mass: a star-forming galaxy main sequence (GMS) and a separate region of 'passive' or 'red and dead galaxies'. Starting from a volume-limited sample of nearby galaxies designed to contain most of the stellar mass…
Disk Masses for Embedded Class I Protostars in the Taurus Molecular Cloud
Sheehan, Patrick D.; Eisner, Josh A.
Class I protostars are thought to represent an early stage in the lifetime of protoplanetary disks, when they are still embedded in their natal envelope. Here we measure the disk masses of 10 Class I protostars in the Taurus Molecular Cloud to constrain the initial mass budget for forming planets in disks. We use radiative transfer modeling to pro…
The Lyman Continuum Escape Fraction of Emission Line-selected z ∼ 2.5 Galaxies Is Less Than 15%
Koekemoer, Anton M.; Teplitz, Harry I.; Rutkowski, Michael J. +9 more
Recent work suggests that strong emission line, star-forming galaxies (SFGs) may be significant Lyman continuum leakers. We combine archival Hubble Space Telescope broadband ultraviolet and optical imaging (F275W and F606W, respectively) with emission line catalogs derived from WFC3 IR G141 grism spectroscopy to search for escaping Lyman continuum…
Revisiting the field geology of Taurus-Littrow
Weiss, B. P.; Robinson, M. S.; Petro, N. E. +3 more
Integration of Apollo 17 field observations and photographs, sample investigations, Lunar Reconnaissance Orbiter Camera images, Chandrayaan-1 Moon Mineralogy Mapper (M3) spectra, and Miniature Radio Frequency (Mini-RF) S-band radar images provides new insights into the geology of the valley of Taurus-Littrow on the Moon. Connecting the …
What does CIVλ1549 tell us about the physical driver of the Eigenvector quasar sequence?
Marziani, P.; Stirpe, G. M.; Perea, J. +8 more
Broad emission lines in quasars enable us to "resolve" structure and kinematics of the broad-line emitting region (BLR) thought to involve an accretion disk feeding a supermassive black hole. Interpretation of broad line measures within the 4DE1 formalism simplifies the apparent confusion among such data by contrasting and unifying properties of s…
Discovery of a Kiloparsec Extended Hard X-Ray Continuum and Fe-Kα from the Compton Thick AGN ESO 428-G014
Elvis, M.; Fabbiano, G.; Raymond, J. +5 more
We report the discovery of kiloparsec-scale diffuse emission in both the hard continuum (3-6 keV) and in the Fe-Kα line in the Compton thick (CT) Seyfert galaxy ESO 428-G014. This extended hard component contains at least ∼24% of the observed 3-8 keV emission, and follows the direction of the extended optical line emission (ionization cone) and ra…
Predicting the Presence of Companions for Stripped-envelope Supernovae: The Case of the Broad-lined Type Ic SN 2002ap
Fox, O. D.; Smith, N.; Filippenko, A. V. +10 more
Many young, massive stars are found in close binaries. Using population synthesis simulations we predict the likelihood of a companion star being present when these massive stars end their lives as core-collapse supernovae (SNe). We focus on stripped-envelope SNe, whose progenitors have lost their outer hydrogen and possibly helium layers before e…
Constraints on primordial magnetic fields from Planck data combined with the South Pole Telescope CMB B -mode polarization measurements
Li, Yun; Pogosian, Levon; Zucca, Alex
A primordial magnetic field (PMF) present before recombination can leave specific signatures on the cosmic microwave background (CMB) fluctuations. Of particular importance is its contribution to the B-mode polarization power spectrum. Indeed, vortical modes sourced by the PMF can dominate the B-mode power spectrum on small scales, as they survive…
Electron and Ion Dynamics of the Solar Wind Interaction with a Weakly Outgassing Comet
Henri, Pierre; Divin, Andrey; Deca, Jan +4 more
Using a 3D fully kinetic approach, we disentangle and explain the ion and electron dynamics of the solar wind interaction with a weakly outgassing comet. We show that, to first order, the dynamical interaction is representative of a four-fluid coupled system. We self-consistently simulate and identify the origin of the warm and suprathermal electr…
Diagnosing collisionless energy transfer using field-particle correlations: gyrokinetic turbulence
Klein, Kristopher G.; Howes, Gregory G.; Tenbarge, Jason M.
Determining the physical mechanisms that extract energy from turbulent fluctuations in weakly collisional magnetized plasmas is necessary for a more complete characterization of the behaviour of a variety of space and astrophysical plasmas. Such a determination is complicated by the complex nature of the turbulence as well as observational constra…