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Witnessing galaxy assembly in an extended z≈3 structure
Prochaska, J. Xavier; Rafelski, Marc; Fumagalli, Michele +9 more
We present new observations acquired with the Multi Unit Spectroscopic Explorer instrument on the Very Large Telescope in a quasar field that hosts a high column density damped Lyα absorber (DLA) at z ≈ 3.25. We detect Lyα emission from a nebula at the redshift of the DLA with line luminosity (27 ± 1) × 1041 erg s- 1, which e…
Detection of the Ultraviolet Spectrum of the Hot Subdwarf Companion of 60 Cygni (B1 Ve) from a Survey of IUE Spectra of Be Stars
Gies, Douglas R.; Wang, Luqian; Peters, Geraldine J.
We used archival International Ultraviolet Explorer (IUE) high-dispersion, short wavelength spectra data to search for evidence of the spectra of hot subdwarf companions of six rapidly rotating Be stars in binary systems. We searched for the signature of a hot companion through an analysis of the cross-correlation functions (CCFs) of observed and …
The relationship between star formation activity and galaxy structural properties in CANDELS and a semi-analytic model
Barro, Guillermo; Bell, Eric F.; Ferguson, Henry C. +13 more
We study the correlation of galaxy structural properties with their location relative to the SFR-M* correlation, also known as the star formation `star-forming main sequence' (SFMS), in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey and Galaxy and Mass Assembly Survey and in a semi-analytic model (SAM) of galaxy form…
The Herschel-ATLAS Data Release 2, Paper I. Submillimeter and Far-infrared Images of the South and North Galactic Poles: The Largest Herschel Survey of the Extragalactic Sky
Smith, Matthew W. L.; Dunne, Loretta; Viaene, Sébastien +11 more
We present the largest submillimeter images that have been made of the extragalactic sky. The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) is a survey of 660 deg2 with the PACS and SPIRE cameras in five photometric bands: 100, 160, 250, 350, and 500 µm. In this paper we present the images from our two largest field…
Fermi Non-detections of Four X-Ray Jet Sources and Implications for the IC/CMB Mechanism
Georganopoulos, Markos; Breiding, Peter; Meyer, Eileen T. +3 more
Since its launch in 1999, the Chandra X-ray observatory has discovered several dozen X-ray jets associated with powerful quasars. In many cases, the X-ray spectrum is hard and appears to come from a second spectral component. The most popular explanation for the kpc-scale X-ray emission in these cases has been inverse-Compton (IC) scattering of Co…
Properties of Turbulence in the Reconnection Exhaust: Numerical Simulations Compared with Observations
Sorriso-Valvo, L.; Goldman, M. V.; Newman, D. L. +6 more
The properties of the turbulence that develops in the outflows of magnetic reconnection have been investigated using self-consistent plasma simulations, in three dimensions. As commonly observed in space plasmas, magnetic reconnection is characterized by the presence of turbulence. Here we provide a direct comparison of our simulations with report…
SPHERE/ZIMPOL observations of the symbiotic system R Aquarii. I. Imaging of the stellar binary and the innermost jet clouds
Quanz, S. P.; Siebenmorgen, R.; Stute, M. +40 more
Context. R Aqr is a symbiotic binary system consisting of a mira variable, a hot companion with a spectacular jet outflow, and an extended emission line nebula. Because of its proximity to the Sun, this object has been studied in much detail with many types of high resolution imaging and interferometric techniques. We have used R Aqr as test targe…
Suprathermal electron acceleration in the near-Earth flow rebounce region
Cao, J. B.; Xu, Y.; Yao, Z. H. +4 more
Flux pileup regions (FPRs) are traditionally referred to the strong-Bz bundles behind dipolarization fronts (DFs) in the Earth's magnetotail and can appear both inside earthward and tailward bursty bulk flows. It has been widely reported that suprathermal electrons (40-200 keV) can be efficiently accelerated inside earthward FPRs, leavi…
Observational Evidence for the Associated Formation of Blobs and Raining Inflows in the Solar Corona
Davies, J. A.; Lavraud, B.; Kilpua, E. +6 more
The origin of the slow solar wind is still a topic of much debate. The continual emergence of small transient structures from helmet streamers is thought to constitute one of the main sources of the slow wind. Determining the height at which these transients are released is an important factor in determining the conditions under which the slow sol…
H2CO Distribution and Formation in the TW HYA Disk
Wilner, David J.; Cleeves, L. Ilsedore; Andrews, Sean M. +8 more
H2CO is one of the most readily detected organic molecules in protoplanetary disks. Yet its distribution and dominant formation pathway(s) remain largely unconstrained. To address these issues, we present ALMA observations of two H2CO lines ({3}12{--}{2}11 and {5}15{--}{4}14) at 0.″…