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Solar cycle variations in the powers and damping rates of low-degree solar acoustic oscillations
Nakariakov, V. M.; Broomhall, A. -M.; Pugh, C. E.
Helioseismology uses the Sun's natural resonant oscillations to study the solar interior. The properties of the solar oscillations are sensitive to the Sun'2019;s magnetic activity cycle. Here we examine variations in the powers, damping rates, and energy supply rates of the most prominent acoustic oscillations in unresolved, Sun-as-a-star data, o…
The Megasecond Chandra X-Ray Visionary Project Observation of NGC 3115. III. Luminosity Functions of LMXBs and Dependence on Stellar Environments
Romanowsky, Aaron J.; Brodie, Jean P.; Remillard, Ronald A. +7 more
We studied the X-ray luminosity function (XLF) of low-mass X-ray binaries (LMXBs) in the nearby lenticular galaxy NGC 3115, using the Megasecond Chandra X-ray Visionary Project Observation. With a total exposure time of ∼1.1 Ms, we constructed the XLF down to a limiting luminosity of ∼1036 erg s-1, which is much deeper than t…
Elemental Abundance Analyses with DAO Spectrograms. XXXVI. The Hot Metallic Line Stars Theta Leonis and Omicron Pegasi
Adelman, Saul J.; Gulliver, Austin F.; Heaton, Robert J.
Spitzer Imaging of Strongly lensed Herschel-selected Dusty Star-forming Galaxies
Scott, D.; Wang, L.; Farrah, D. +23 more
We present the rest-frame optical spectral energy distribution (SED) and stellar masses of six Herschel-selected gravitationally lensed dusty, star-forming galaxies (DSFGs) at 1 < z < 3. These galaxies were first identified with Herschel/SPIRE imaging data from the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) and the Herschel…
Dynamics of polar vortices at cloud top and base on Venus inferred from a general circulation model: Case of a strong diurnal thermal tide
Yamamoto, Masaru; Takahashi, Masaaki
Polar vortices in the presence of a thermal tide are investigated using a Venusian middle atmosphere general circulation model. Around the cloud top, where the warm polar region is maintained by the thermal wind associated with a high latitude jet, the temperature contrast forms the polar vortex pattern. The cold collar and hot oval (monopole) nea…
Storms on Venus: Lightning-induced chemistry and predicted products
Baines, K. H.; Delitsky, M. L.
Observations by many spacecraft that have visited Venus over the last 40 years appear to confirm the presence of lightning storms in the Venus atmosphere. Recent observations by Venus Express indicate that lightning frequency and power is similar to that on Earth. While storms are occurring, energy deposition by lightning into Venus atmospheric co…
Flare Footpoint Regions and a Surge Observed by Hinode/EIS, RHESSI, and SDO/AIA
Reep, J. W.; Doschek, G. A.; Warren, H. P. +2 more
The Extreme-ultraviolet Imaging Spectrometer (EIS) on the Hinode spacecraft observed flare footpoint regions coincident with a surge for an M3.7 flare observed on 2011 September 25 at N12 E33 in active region 11302. The flare was observed in spectral lines of O vi, Fe x, Fe xii, Fe xiv, Fe xv, Fe xvi, Fe xvii, Fe xxiii, and Fe xxiv. The EIS observ…
Trident: A three-pronged galaxy survey. I. Lyman alpha emitting galaxies at z ~ 2 in GOODS North
Östlin, G.; Hayes, M.; Guaita, L. +2 more
Context. Lyman alpha (Lyα) emitting galaxies (LAEs) are used to probe the distant universe and are therefore important for galaxy evolution studies and for providing clues to the nature of the epoch of reionization. However, the exact circumstances under which Lyα escapes a galaxy are still not fully understood.
Aims: The Trident project is d…
Primordial alignment of elliptical galaxies in intermediate redshift clusters
Rong, Yu; Zhang, Shuang-Nan; Liao, Jin-Yuan
We measure primordial alignments for the red galaxies in the sample of eight massive galaxy clusters in the southern sky from the Cluster Lensing And Supernova survey with Hubble-Very Large Telescope (CLASH-VLT) Large Programme, at a median redshift of 0.375. We find primordial alignment with about 3σ significance in the four dynamically young clu…
Active-Region Twist Derived from Magnetic Tongues and Linear Force-Free Extrapolations
Démoulin, Pascal; Mandrini, Cristina H.; López Fuentes, Marcelo +1 more
The main aim of this study is to compare the amount of twist present in emerging active regions (ARs) from photospheric and coronal data. We use linear force-free field models of the observed coronal structure of ARs to determine the global twist. The coronal twist is derived, on one hand, from the force-free parameter [α ] of the model and, on th…