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Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap
Miville-Deschênes, M. -A.; Boulanger, F.; Bernard, J. -P. +165 more
Using data from the Planck satellite, we study the statistical properties of interstellar dust polarization at high Galactic latitudes around the south pole (b < -60°). Our aim is to advance the understanding of the magnetized interstellar medium (ISM), and to provide a modelling framework of the polarized dust foreground for use in cosmic micr…
Cosmological constraints on decoupled dark photons and dark Higgs
Berger, Joshua; Jedamzik, Karsten; Walker, Devin G. E.
Any neutral boson such as a dark photon or dark Higgs that is part of a non-standard sector of particles can mix with its standard model counterpart. When very weakly mixed with the Standard Model, these particles are produced in the early Universe via the freeze-in mechanism and subsequently decay back to standard model particles. In this work, w…
Dark matter component decaying after recombination: Lensing constraints with Planck data
Chudaykin, A.; Gorbunov, D.; Tkachev, I.
It has been recently suggested [Z. Berezhiani, A. D. Dolgov, and I. I. Tkachev, Phys. Rev. D 92, 061303 (2015)] that emerging tension between cosmological parameter values derived in high-redshift (CMB anisotropy) and low-redshift (cluster counts, Hubble constant) measurements can be reconciled in a model which contains a subdominant fraction of d…
Dust attenuation in z ~ 1 galaxies from Herschel and 3D-HST Hα measurements
Berta, S.; Lutz, D.; Cimatti, A. +12 more
We combined the spectroscopic information from the 3D-HST survey with Herschel data to characterize the Hα dust attenuation properties of a sample of 79 main sequence star-forming galaxies at z ~ 1 in the GOODS-S field. The sample was selected in the far-IR at λ = 100 and/or 160 µm and only includes galaxies with a secure Hα detection (S/N &…
Reconnection brightenings in the quiet solar photosphere
Rouppe van der Voort, Luc H. M.; Rutten, Robert J.; Vissers, Gregal J. M.
We describe a new quiet-Sun phenomenon which we call quiet-Sun Ellerman-like brightenings (QSEB). QSEBs are similar to Ellerman bombs (EB) in some respects but differ significantly in others. EBs are transient brightenings of the wings of the Balmer Hα line that mark strong-field photospheric reconnection in complex active regions. QSEBs are simil…
Gamma rays detected from Cygnus X-1 with likely jet origin
Aharonian, F.; Blanch, O.; de Oña Wilhelmi, E. +4 more
Aims: We probe the high-energy (>60 MeV) emission from the black hole X-ray binary system, Cygnus X-1, and investigate its origin.
Methods: We analyzed 7.5 yr of data by Fermi-LAT with the latest Pass 8 software version.
Results: We report the detection of a signal at 8σ statistical significance that is spatially coincident with …
The Evolution of the Fractions of Quiescent and Star-forming Galaxies as a Function of Stellar Mass Since z = 3: Increasing Importance of Massive, Dusty Star-forming Galaxies in the Early Universe
van Dokkum, Pieter G.; Martis, Nicholas S.; Muzzin, Adam +7 more
Using the UltraVISTA DR1 and 3D-HST catalogs, we construct a stellar-mass-complete sample, unique for its combination of surveyed volume and depth, to study the evolution of the fractions of quiescent galaxies, moderately unobscured star-forming galaxies, and dusty star-forming galaxies as a function of stellar mass over the redshift interval 0.2 …
Sunset jets observed on comet 67P/Churyumov-Gerasimenko sustained by subsurface thermal lag
Jorda, L.; Lamy, P. L.; Lara, L. M. +46 more
We present observations of sunset jets on comet 67P/Churyumov-Gerasimenko by Rosetta/OSIRIS camera. In late April 2015, when the comet was at a heliocentric distance of ~1.8 AU, clusters of dust jets that originated in the Ma'at region on the comet's small lobe were identified from multipleimages and were apparently sustained for about an hour bey…
Mass loading at 67P/Churyumov-Gerasimenko: A case study
Behar, E.; Nilsson, H.; Richter, I. +3 more
We study the dynamics of the interaction between the solar wind ions and a partially ionized atmosphere around a comet, at a distance of 2.88 AU from the Sun during a period of low nucleus activity. Comparing particle data and magnetic field data for a case study, we highlight the prime role of the solar wind electric field in the cometary ion dyn…
The Morphologies and Alignments of Gas, Mass, and the Central Galaxies of CLASH Clusters of Galaxies
Donahue, Megan; Voit, G. Mark; Zitrin, Adi +10 more
Morphology is often used to infer the state of relaxation of galaxy clusters. The regularity, symmetry, and degree to which a cluster is centrally concentrated inform quantitative measures of cluster morphology. The Cluster Lensing and Supernova survey with Hubble Space Telescope (CLASH) used weak and strong lensing to measure the distribution of …