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Quasi-periodic Slipping Magnetic Reconnection During an X-class Solar Flare Observed by the Solar Dynamics Observatory and Interface Region Imaging Spectrograph
Li, Ting; Zhang, Jun
We first report the quasi-periodic slipping motion of flare loops during an eruptive X-class flare on 2014 September 10. The slipping motion was investigated at a specific location along one of the two ribbons and can be observed throughout the impulsive phase of the flare. The apparent slipping velocity was 20-110 km s-1, and the assoc…
Dust Continuum Emission as a Tracer of Gas Mass in Galaxies
Calzetti, Daniela; Schinnerer, Eva; Walter, Fabian +8 more
We use a sample of 36 galaxies from the KINGFISH (Herschel IR), HERACLES (IRAM CO), and THINGS (Very Large Array H I) surveys to study empirical relations between Herschel infrared (IR) luminosities and the total mass of the interstellar gas (H2 + H I). Such a comparison provides a simple empirical relationship without introducing the u…
Properties of dark subhaloes from gaps in tidal streams
Erkal, Denis; Belokurov, Vasily
Cold or warm, the dark matter substructure spectrum must extend to objects with masses as low as 107 M⊙, according to the most recent Lyman α measurements. Around a Milky Way-like galaxy, more than a thousand of these subhaloes will not be able to form stars but are dense enough to survive even deep down in the potential well…
Validation for solar wind prediction at Earth: Comparison of coronal and heliospheric models installed at the CCMC
Jian, L. K.; Odstrcil, D.; Riley, P. +6 more
Multiple coronal and heliospheric models have been recently upgraded at the Community Coordinated Modeling Center (CCMC), including the Wang-Sheeley-Arge (WSA)-Enlil model, MHD-Around-a-Sphere (MAS)-Enlil model, Space Weather Modeling Framework (SWMF), and heliospheric tomography using interplanetary scintillation data. To investigate the effects …
Occurrence of radio halos in galaxy clusters. Insight from a mass-selected sample
Brunetti, G.; Kale, R.; Venturi, T. +4 more
Context. Giant radio halos (RH) are diffuse Mpc-scale synchrotron sources detected in some massive and merging galaxy clusters. An unbiased study of the statistical properties of RHs is crucial to constraining their origin and evolution.
Aims: We investigate the occurrence of RHs and its dependence on the cluster mass in a Sunyaev-Zel'dovich …
The Composition of Comets
Mumma, Michael J.; Cochran, Anita L.; Schleicher, David G. +10 more
This paper is the result of the International Cometary Workshop, held in Toulouse, France in April 2014, where the participants came together to assess our knowledge of comets prior to the ESA Rosetta Mission. In this paper, we look at the composition of the gas and dust from the comae of comets. With the gas, we cover the various taxonomic studie…
The Sloan Lens ACS Survey. XII. Extending Strong Lensing to Lower Masses
Treu, Tommaso; Brownstein, Joel R.; Gavazzi, Raphaël +8 more
We present observational results from a new Hubble Space Telescope (HST) Snapshot program to extend the methods of the Sloan Lens ACS (SLACS) Survey to lower lens-galaxy masses. We discover 40 new galaxy-scale strong lenses, which we supplement with 58 previously discovered SLACS lenses. In addition, we determine the posterior PDFs of the Einstein…
Galaxy-wide outflows in z ~ 1.5 luminous obscured quasars revealed through near-IR slit-resolved spectroscopy
Maiolino, R.; Salvato, M.; Marconi, A. +10 more
Aims: The co-evolution of galaxies and supermassive black holes (SMBHs) requires that some sort of feedback mechanism is operating during the active galactic nuclei (AGN) phases. AGN driven winds are the most likely candidates for such feedback mechanism, but direct observational evidence of their existence and of their effects on the host ga…
Stellar diameters and temperatures - VI. High angular resolution measurements of the transiting exoplanet host stars HD 189733 and HD 209458 and implications for models of cool dwarfs
López-Morales, Mercedes; Kane, Stephen R.; Brewer, John +24 more
We present direct radii measurements of the well-known transiting exoplanet host stars HD 189733 and HD 209458 using the CHARA Array interferometer. We find the limb-darkened angular diameters to be θLD = 0.3848 ± 0.0055 and 0.2254 ± 0.0072 mas for HD 189733 and HD 209458, respectively. HD 189733 and HD 209458 are currently the only two…
A High-Resolution Hubble Space Telescope Study of Apparent Lyman Continuum Leakers at z~3
Reddy, N. A.; Shapley, A. E.; Siana, B. +3 more
We present U336V606J125H160 follow-up Hubble Space Telescope (HST) observations of 16 z ∼ 3 candidate Lyman continuum (LyC) emitters in the HS1549+1919 field. With these data, we obtain high spatial-resolution photometric redshifts of all sub-arcsecond components of the LyC candidates in order to elimina…