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What is the Physical Origin of Strong Lyα Emission? II. Gas Kinematics and Distribution of Lyα Emitters
Ono, Yoshiaki; Ouchi, Masami; Shibuya, Takatoshi +8 more
We present a statistical study of velocities of Lyα, interstellar (IS) absorption, and nebular lines and gas covering fraction for Lyα emitters (LAEs) at z ~= 2. We make a sample of 22 LAEs with a large Lyα equivalent width (EW) of >~ 50 Å based on our deep Keck/Low Resolution Imaging Spectrometer (LRIS) observations, in conjunction with spectr…
Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models
Dandouras, Iannis; Malova, Helmi V.; Grigorenko, Elena E. +13 more
Knowledge of the ion composition in the near-Earth's magnetosphere and plasma sheet is essential for the understanding of magnetospheric processes and instabilities. The presence of heavy ions of ionospheric origin in the magnetosphere, in particular oxygen (O+), influences the plasma sheet bulk properties, current sheet (CS) thickness …
X-ray emission from star-forming galaxies - III. Calibration of the LX-SFR relation up to redshift z ≈ 1.3
Sunyaev, R.; Lehmer, B. D.; Morrison, G. E. +2 more
We investigate the relation between total X-ray emission from star-forming galaxies and their star formation activity. Using nearby late-type galaxies and ultraluminous infrared galaxies from Paper I and star-forming galaxies from Chandra Deep Fields (CDFs), we construct a sample of 66 galaxies spanning the redshift range z ≈ 0-1.3 and the star fo…
Evidence of nonthermal particles in coronal loops heated impulsively by nanoflares
Golub, L.; Tian, H.; De Pontieu, B. +21 more
The physical processes causing energy exchange between the Sun’s hot corona and its cool lower atmosphere remain poorly understood. The chromosphere and transition region (TR) form an interface region between the surface and the corona that is highly sensitive to the coronal heating mechanism. High-resolution observations with the Interface Region…
An Interface Region Imaging Spectrograph First View on Solar Spicules
Golub, L.; Tian, H.; De Pontieu, B. +17 more
Solar spicules have eluded modelers and observers for decades. Since the discovery of the more energetic type II, spicules have become a heated topic but their contribution to the energy balance of the low solar atmosphere remains unknown. Here we give a first glimpse of what quiet-Sun spicules look like when observed with NASA's recently launched…
CANDELS/GOODS-S, CDFS, and ECDFS: Photometric Redshifts for Normal and X-Ray-Detected Galaxies
Barro, Guillermo; Ferguson, Henry C.; Grazian, Andrea +29 more
We present photometric redshifts and associated probability distributions for all detected sources in the Extended Chandra Deep Field South (ECDFS). This work makes use of the most up-to-date data from the Cosmic Assembly Near-IR Deep Legacy Survey (CANDELS) and the Taiwan ECDFS Near-Infrared Survey (TENIS) in addition to other data. We also revis…
Anomalous expansion of coronal mass ejections during solar cycle 24 and its space weather implications
Gopalswamy, Nat; Akiyama, Sachiko; Yashiro, Seiji +3 more
The familiar correlation between the speed and angular width of coronal mass ejections (CMEs) is also found in solar cycle 24, but the regression line has a larger slope: for a given CME speed, cycle 24 CMEs are significantly wider than those in cycle 23. The slope change indicates a significant change in the physical state of the heliosphere, due…
Strongest model-independent bound on the lifetime of Dark Matter
Tram, Thomas; Lesgourgues, Julien; Mangano, Gianpiero +2 more
Dark Matter is essential for structure formation in the late Universe so it must be stable on cosmological time scales. But how stable exactly? Only assuming decays into relativistic particles, we report an otherwise model independent bound on the lifetime of Dark Matter using current cosmological data. Since these decays affect only the low ℓ mul…
The evolution of massive stars and their spectra. I. A non-rotating 60 M⊙ star from the zero-age main sequence to the pre-supernova stage
Meynet, Georges; Groh, Jose H.; Ekström, Sylvia +1 more
For the first time, the interior and spectroscopic evolution of a massive star is analyzed from the zero-age main sequence (ZAMS) to the pre-supernova (SN) stage. For this purpose, we combined stellar evolution models using the Geneva code and stellar atmospheric/wind models using CMFGEN. With our approach, we were able to produce observables, suc…
A library of near-infrared integral field spectra of young M-L dwarfs
Pinte, C.; Homeier, D.; Lagrange, A. -M. +5 more
Context. At young ages, low surface gravity affects the atmospheric properties of ultracool dwarfs. The impact on medium-resolution near-infrared (NIR) spectra has only been slightly investigated at the M-L transition so far.
Aims: We present a library of NIR (1.1-2.45 µm) medium-resolution (R ~ 1500-2000) integral field spectra of 15 y…