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Why Does the Apparent Mass of a Coronal Mass Ejection Increase?
Feng, Li; Lu, Lei; Gan, Weiqun +4 more
Mass is one of the most fundamental parameters characterizing the dynamics of a coronal mass ejection (CME). It has been found that CME apparent mass measured from the brightness enhancement in coronagraphs increases during its evolution in the corona. However, the physics behind it is not clear. Does the apparent mass gain come from the outflow f…
The Subaru-XMM-Newton Deep Survey (SXDS). VIII. Multi-wavelength identification, optical/NIR spectroscopic properties, and photometric redshifts of X-ray sources†
Ouchi, Masami; Simpson, Chris; Curtis-Lake, Emma +27 more
We report on the multi-wavelength identification of the X-ray sources found in the Subaru-XMM-Newton Deep Survey (SXDS) using deep imaging data covering the wavelength range between the far-UV and mid-IR (MIR). We select a primary counterpart of each X-ray source by applying the likelihood ratio method to R-band, 3.6 µm, near-UV, and 24 &mic…
The photospheric Poynting flux and coronal heating
Welsch, Brian T.
Some models of coronal heating suppose that convective motions at the photosphere shuffle the footpoints of coronal magnetic fields and thereby inject sufficient magnetic energy upward to account for observed coronal and chromospheric energy losses in active regions. Using high-resolution observations of plage magnetic fields made with the Solar O…
C-Band All-Sky Survey: a first look at the Galaxy
Davies, R. D.; Davis, R. J.; Dickinson, C. +18 more
We present an analysis of the diffuse emission at 5 GHz in the first quadrant of the Galactic plane using two months of preliminary intensity data taken with the C-Band All-Sky Survey (C-BASS) northern instrument at the Owens Valley Radio Observatory, California. Combining C-BASS maps with ancillary data to make temperature-temperature plots, we f…
Robustness of cosmological axion mass limits
Di Valentino, Eleonora; Mena, Olga; Gariazzo, Stefano +1 more
We present the cosmological bounds on the thermal axion mass in an extended cosmological scenario in which the primordial power spectrum of scalar perturbations differs from the usual power-law shape predicted by the simplest inflationary models. The power spectrum is instead modeled by means of a "piecewise cubic Hermite interpolating polynomial"…
Co-evolution of Extreme Star Formation and Quasars: Hints from Herschel and the Sloan Digital Sky Survey
Yan, Haojing; Ma, Zhiyuan
Using the public data from the Herschel wide-field surveys, we study the far-infrared properties of optical-selected quasars from the Sloan Digital Sky Survey. Within the common area of ∼172 deg2 , we have identified the far-infrared counterparts for 354 quasars, among which 134 are highly secure detections in the Herschel 250 µ {…
A search for variable and transient radio sources in the extended Chandra Deep Field South at 5.5 GHz
Gaensler, B. M.; Bell, M. E.; Murphy, Tara +5 more
We present a three epoch survey for transient and variables in the extended Chandra Deep Field South at 5.5 GHz with the Australia Telescope Compact Array. A region covering ∼0.3 deg2 was observed on time-scales of 2.5 months and 2.5 yr and typical sensitivities 12.1-17.1 µJy beam-1 (1σ) were achieved. This survey repre…
The Far-Ultraviolet Ups and Downs of Alpha Centauri
Ayres, Thomas R.
Four years (2010-2014) of semiannual pointings by the Hubble Space Telescope Imaging Spectrograph (STIS) on nearby Alpha Centauri have yielded a detailed time history of far-ultraviolet (FUV: 1150-1700 Å) emissions of the solarlike primary (A: G2 V) and the cooler but more active secondary (B: K1 V). This period saw A climbing out of a prolonged c…
Photochemical control of the distribution of Venusian water
Gao, Peter; Parkinson, Christopher D.; Esposito, Larry +3 more
We use the JPL/Caltech 1-D photochemical model to solve continuity diffusion equation for atmospheric constituent abundances and total number density as a function of radial distance from the planet Venus. Photochemistry of the Venus atmosphere from 58 to 112 km is modeled using an updated and expanded chemical scheme (Zhang et al., 2010, 2012), g…
A Pilot Deep Survey for X-Ray Emission from fuvAGB Stars
Stute, M.; Sahai, R.; Sánchez Contreras, C. +1 more
We report the results of a pilot survey for X-ray emission from a newly discovered class of AGB stars with far-ultraviolet excesses (fuvAGB stars) using XMM-Newton and Chandra. We detected X-ray emission in three of six fuvAGB stars observed—the X-ray fluxes are found to vary in a stochastic or quasi-periodic manner on roughly hour-long timescales…