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Propagation of cosmic rays in the AMS-02 era
Fang, Kun; Yuan, Qiang; Lin, Su-Jie +1 more
In this work we use the newly reported boron-to-carbon ratio (B/C) from AMS-02 and the time-dependent proton fluxes from PAMELA and AMS-02 to constrain the source and propagation parameters of cosmic rays in the Milky Way. A linear correlation of the solar modulation parameter with solar activities is assumed to account for the time-varying cosmic…
All-sky Co-moving Recovery Of Nearby Young Members (ACRONYM). II. The β Pictoris Moving Group
Kraus, Adam L.; Shkolnik, Evgenya L.; Liu, Michael C. +2 more
We confirm 66 low-mass stellar and brown dwarf systems (K7-M9) plus 19 visual or spectroscopic companions of the β Pictoris moving group (BPMG). Of these, 41 are new discoveries, increasing the known low-mass members by 45%. We also add four objects to the 14 known with masses predicted to be less than 0.07 {M}⊙ . Our efficient photomet…
X-Ray Morphological Analysis of the Planck ESZ Clusters
Lovisari, Lorenzo; Andrade-Santos, Felipe; Jones, Christine +7 more
X-ray observations show that galaxy clusters have a very large range of morphologies. The most disturbed systems, which are good to study how clusters form and grow and to test physical models, may potentially complicate cosmological studies because the cluster mass determination becomes more challenging. Thus, we need to understand the cluster pr…
The pristine interior of comet 67P revealed by the combined Aswan outburst and cliff collapse
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +61 more
Outbursts occur commonly on comets1 with different frequencies and scales2,3. Despite multiple observations suggesting various triggering processes4,5, the driving mechanism of such outbursts is still poorly understood. Landslides have been invoked6 to explain some outbursts on comet 103P/Hartley 2, alth…
The MUSE-Wide survey: A first catalogue of 831 emission line galaxies
Bacon, Roland; Brinchmann, Jarle; Weilbacher, Peter M. +11 more
We present a first instalment of the MUSE-Wide survey, covering an area of 22.2 arcmin2 (corresponding to 20% of the final survey) in the CANDELS/Deep area of the Chandra Deep Field South. We use the MUSE integral field spectrograph at the ESO VLT to conduct a full-area spectroscopic mapping at a depth of 1 h exposure time per 1 arcmin<…
Fibers in the NGC 1333 proto-cluster
Alves, J.; Tafalla, M.; Hacar, A.
Are the initial conditions for clustered star formation the same as for non-clustered star formation? To investigate the initial gas properties in young proto-clusters we carried out a comprehensive and high-sensitivity study of the internal structure, density, temperature, and kinematics of the dense gas content of the NGC 1333 region in Perseus,…
Reverberation Mapping of Optical Emission Lines in Five Active Galaxies
Kim, S.; Kaspi, Shai; Kochanek, C. S. +68 more
We present the first results from an optical reverberation mapping campaign executed in 2014 targeting the active galactic nuclei (AGNs) MCG+08-11-011, NGC 2617, NGC 4051, 3C 382, and Mrk 374. Our targets have diverse and interesting observational properties, including a “changing look” AGN and a broad-line radio galaxy. Based on continuum-Hβ lags…
Pulsator-like Spectra from Ultraluminous X-Ray Sources and the Search for More Ultraluminous Pulsars
Mereghetti, S.; Stella, L.; Wolter, A. +3 more
Ultraluminous X-ray sources (ULXs) are a population of extragalactic objects whose luminosity exceeds the Eddington limit for a 10 M ⊙ black hole (BH). Their properties have been widely interpreted in terms of accreting stellar-mass or intermediate-mass BHs. However at least three neutron stars (NSs) have been recently identified in ULX…
Data-constrained Coronal Mass Ejections in a Global Magnetohydrodynamics Model
Gombosi, T. I.; Tóth, G.; Taktakishvili, A. +6 more
We present a first-principles-based coronal mass ejection (CME) model suitable for both scientific and operational purposes by combining a global magnetohydrodynamics (MHD) solar wind model with a flux-rope-driven CME model. Realistic CME events are simulated self-consistently with high fidelity and forecasting capability by constraining initial f…
Galaxy Environment in the 3D-HST Fields: Witnessing the Onset of Satellite Quenching at z ∼ 1-2
Wuyts, E.; Wuyts, S.; Förster Schreiber, N. M. +25 more
We make publicly available a catalog of calibrated environmental measures for galaxies in the five 3D-Hubble Space Telescope (HST)/CANDELS deep fields. Leveraging the spectroscopic and grism redshifts from the 3D-HST survey, multiwavelength photometry from CANDELS, and wider field public data for edge corrections, we derive densities in fixed aper…