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The Mass, Color, and Structural Evolution of Today’s Massive Galaxies Since z ∼ 5
Franx, Marijn; Muzzin, Adam; van Dokkum, Pieter +12 more
In this paper, we use stacking analysis to trace the mass growth, color evolution, and structural evolution of present-day massive galaxies ({log}({M}* /{M}⊙ )=11.5) out to z = 5. We utilize the exceptional depth and area of the latest UltraVISTA data release, combined with the depth and unparalleled seeing of CANDELS to gath…
Connecting Clump Sizes in Turbulent Disk Galaxies to Instability Theory
Glazebrook, Karl; Bolatto, Alberto D.; Obreschkow, Danail +8 more
In this letter we study the mean sizes of Hα clumps in turbulent disk galaxies relative to kinematics, gas fractions, and Toomre Q. We use ∼100 pc resolution HST images, IFU kinematics, and gas fractions of a sample of rare, nearby turbulent disks with properties closely matched to z∼ 1.5{--}2 main-sequence galaxies (the DYNAMO sample). We find li…
The MOSDEF Survey: Metallicity Dependence of PAH Emission at High Redshift and Implications for 24 µm Inferred IR Luminosities and Star Formation Rates at z ∼ 2
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +9 more
We present results on the variation of 7.7 µm polycyclic aromatic hydrocarbon (PAH) emission in galaxies spanning a wide range in metallicity at z ∼ 2. For this analysis, we use rest-frame optical spectra of 476 galaxies at 1.37 ≤ z ≤ 2.61 from the MOSFIRE Deep Evolution Field (MOSDEF) survey to infer metallicities and ionization states. Spi…
Energy conversion at dipolarization fronts
André, M.; Vaivads, A.; Khotyaintsev, Yu. V. +2 more
We use multispacecraft observations by Cluster in the Earth's magnetotail and 3-D particle-in-cell simulations to investigate conversion of electromagnetic energy at the front of a fast plasma jet. We find that the major energy conversion is happening in the Earth (laboratory) frame, where the electromagnetic energy is being transferred from the e…
Hubble Space Telescope Detection of the Millisecond Pulsar J2124-3358 and its Far-ultraviolet Bow Shock Nebula
van Kerkwijk, M. H.; Pavlov, G. G.; Guillot, S. +4 more
We observed the nearby millisecond pulsar J2124-3358 with the Hubble Space Telescope in broad far-UV (FUV) and optical filters. The pulsar is detected in both bands with fluxes F(1250-2000 Å) = (2.5 ± 0.3) × 10-16 erg s-1 cm-2 and F(3800-6000 Å) = (6.4 ± 0.4) × 10-17 erg s-1 cm-2, w…
Nitrogen-to-carbon atomic ratio measured by COSIMA in the particles of comet 67P/Churyumov-Gerasimenko
Langevin, Yves; Fischer, Henning; Briois, Christelle +24 more
The COmetary Secondary Ion Mass Analyzer (COSIMA) on board the Rosetta mission has analysed numerous cometary dust particles collected at very low velocities (a few m s-1) in the environment of comet 67P/Churyumov-Gerasimenko (hereafter 67P). In these particles, carbon and nitrogen are expected mainly to be part of the organic matter. W…
Compact solar UV burst triggered in a magnetic field with a fan-spine topology
Peter, H.; Chitta, L. P.; Young, P. R. +1 more
Context. Solar ultraviolet (UV) bursts are small-scale features that exhibit intermittent brightenings that are thought to be due to magnetic reconnection. They are observed abundantly in the chromosphere and transition region, in particular in active regions.
Aims: We investigate in detail a UV burst related to a magnetic feature that is adv…
The magnetic connectivity of coronal shocks from behind-the-limb flares to the visible solar surface during γ-ray events
Rouillard, A. P.; Plotnikov, I.; Share, G. H.
Context. The observation of >100 MeV γ-rays in the minutes to hours following solar flares suggests that high-energy particles interacting in the solar atmosphere can be stored and/or accelerated for long time periods. The occasions when γ-rays are detected even when the solar eruptions occurred beyond the solar limb as viewed from Earth provid…
A Model of the Hα and Na Transmission Spectrum of HD 189733b
Arras, Phil; Li, Zhi-Yun; Christie, Duncan +1 more
This paper presents a detailed hydrostatic model of the upper atmosphere of HD 189733b, with the goal of constraining its temperature, particle densities, and radiation field over the pressure range 10-4 to 10 µbar, where the observed Hα transmission spectrum is produced. The atomic hydrogen level population is computed including …
Statistical simulations of the dust foreground to cosmic microwave background polarization
Boulanger, F.; Aumont, J.; Ghosh, T. +6 more
The characterization of the dust polarization foreground to the cosmic microwave background (CMB) is a necessary step toward the detection of the B-mode signal associated with primordial gravitational waves. We present a method to simulate maps of polarized dust emission on the sphere that is similar to the approach used for CMB anisotropies. This…