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The Atmospheric Response to High Nonthermal Electron Beam Fluxes in Solar Flares. I. Modeling the Brightest NUV Footpoints in the X1 Solar Flare of 2014 March 29
Kowalski, Adam F.; Daw, Adrian; Carlsson, Mats +2 more
The 2014 March 29 X1 solar flare (SOL20140329T17:48) produced bright continuum emission in the far- and near-ultraviolet (NUV) and highly asymmetric chromospheric emission lines, providing long-sought constraints on the heating mechanisms of the lower atmosphere in solar flares. We analyze the continuum and emission line data from the Interface Re…
Resolving the fragmentation of high line-mass filaments with ALMA: the integral shaped filament in Orion A
Henning, T.; Megeath, S. T.; Beuther, H. +5 more
We study the fragmentation of the nearest high line-mass filament, the integral shaped filament (ISF, line-mass 400 M⊙ pc-1) in the Orion A molecular cloud. We have observed a 1.6 pc long section of the ISF with the Atacama Large Millimetre/submillimeter Array (ALMA) at 3 mm continuum emission, at a resolution of 3″ (1200 AU)…
The XMM cluster outskirts project (X‑ COP )
Pointecouteau, E.; Paltani, S.; Molendi, S. +3 more
Galaxy clusters are thought to grow hierarchically through the continuous merging and accretion of smaller structures across cosmic time. In the local Universe, these phenomena are still active in the outer regions of massive clusters ($R>R_{500}$), where the matter distribution is expected to become clumpy and asymmetric because of the presenc…
Chasing Shadows: Rotation of the Azimuthal Asymmetry in the TW Hya Disk
Weinberger, Alycia J.; Debes, John H.; Roberge, Aki +8 more
We have obtained new images of the protoplanetary disk orbiting TW Hya in visible, total intensity light with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST), using the newly commissioned BAR5 occulter. These HST/STIS observations achieved an inner working angle of ∼0.″2, or 11.7 au, probing the system at angula…
PHAT. XIX. The Ancient Star Formation History of the M31 Disk
Bell, Eric F.; Monachesi, Antonela; Dolphin, Andrew E. +7 more
We map the star formation history across M31 by fitting stellar evolution models to color-magnitude diagrams of each 83″ × 83″ (0.3 × 1.4 kpc, deprojected) region of the Panchromatic Hubble Andromeda Treasury (PHAT) survey outside of the innermost 6\prime × 12\prime portion. We find that most of the star formation occurred pr…
The cool-core state of Planck SZ-selected clusters versus X-ray-selected samples: evidence for cool-core bias
Rossetti, M.; Molendi, S.; Gastaldello, F. +4 more
We characterized the population of galaxy clusters detected with the Sunyaev-Zeldovich (SZ) effect with Planck by measuring the cool-core state of the objects in a well-defined subsample of the Planck SZ catalogue. We used as an indicator the concentration parameter. The fraction of cool-core clusters is 29 ± 4 per cent and does not show significa…
The Breakthrough Listen Search for Intelligent Life: Target Selection of Nearby Stars and Galaxies
DeBoer, David; Marcy, Geoffrey W.; Siemion, Andrew P. V. +10 more
We present the target selection for the Breakthrough Listen search for extraterrestrial intelligence during the first year of observations at the Green Bank Telescope, Parkes Telescope, and Automated Planet Finder. On the way to observing 1,000,000 nearby stars in search of technological signals, we present three main sets of objects we plan to ob…
Testing the universality of the star-formation efficiency in dense molecular gas
Braine, J.; André, Ph.; Könyves, V. +7 more
Context. Recent studies with, for example, Spitzer and Herschel have suggested that star formation in dense molecular gas may be governed by essentially the same "law" in Galactic clouds and external galaxies. This conclusion remains controversial, however, in large part because different tracers have been used to probe the mass of dense molecular…
The KMOS Deep Survey (KDS) - I. Dynamical measurements of typical star-forming galaxies at z ≃ 3.5
McLure, R. J.; Dunlop, J. S.; Swinbank, A. M. +7 more
We present dynamical measurements from the KMOS (K-band multi-object spectrograph) Deep Survey (KDS), which comprises 77 typical star-forming galaxies at z ≃ 3.5 in the mass range 9.0 < log (M⋆/M⊙) < 10.5. These measurements constrain the internal dynamics, the intrinsic velocity dispersions (σint) and rotati…
Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects
Prusti, T.; Mazeh, T.; Zucker, S. +589 more
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry, the proper motion and parallax are calculated using HIPPARCOS and Tycho-2 positions in 1991.25 as prior information.
Aims: We investigate the scientific potential a…