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The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers of ionized outflows in the host galaxies of X-ray AGN
Alexander, D. M.; Bauer, F. E.; Swinbank, A. M. +7 more
We present the first results from the KMOS (K-band Multi-Object Spectrograph) AGN (active galactic nuclei) Survey at High redshift (KASHz), a VLT/KMOS integral-field spectroscopic (IFS) survey of z ≳ 0.6 AGN. We present galaxy-integrated spectra of 89 X-ray AGN (L2-10 keV = 1042-1045 erg s-1), for which …
Black hole, neutron star and white dwarf candidates from microlensing with OGLE-III
Soszyński, I.; Udalski, A.; Szymański, M. K. +13 more
Most stellar remnants so far have been found in binary systems, where they interact with matter from their companions. Isolated neutron stars and black holes are difficult to find as they are dark, yet they are predicted to exist in our Galaxy in vast numbers. We explored the OGLE-III data base of 150 million objects observed in years 2001-2009 an…
Tracing the Reionization Epoch with ALMA: [C II] Emission in z ∼ 7 Galaxies
Maiolino, R.; Giavalisco, M.; Castellano, M. +12 more
We present new results on [C II]158 µ {{m}} emission from four galaxies in the reionization epoch. These galaxies were previously confirmed to be at redshifts between 6.6 and 7.15 from the presence of the Lyα emission line in their spectra. The Lyα emission line is redshifted by 100-200 km s-1 compared to the systemic redshift giv…
A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2
Murphy, E. J.; Weiss, A.; Greve, T. R. +18 more
Using the Australia Telescope Compact Array, we conducted a survey of CO J = 1 - 0 and J = 2 - 1 line emission towards strongly lensed high-redshift dusty star-forming galaxies (DSFGs) previously discovered with the South Pole Telescope (SPT). Our sample comprises 17 sources that had CO-based spectroscopic redshifts obtained with the Atacama Large…
Observing the release of twist by magnetic reconnection in a solar filament eruption
Zhang, Jun; Bi, Yi; Xue, Zhike +9 more
Magnetic reconnection is a fundamental process of topology change and energy release, taking place in plasmas on the Sun, in space, in astrophysical objects and in the laboratory. However, observational evidence has been relatively rare and typically only partial. Here we present evidence of fast reconnection in a solar filament eruption using hig…
Early and Extended Helium Reionization over More Than 600 Million Years of Cosmic Time
Hennawi, Joseph F.; Worseck, Gábor; Prochaska, J. Xavier +1 more
We measure the effective optical depth of He II Lyα absorption {τ }{eff,{He}{{II}}} at 2.3\lt z\lt 3.5 in 17 UV-transmitting quasars observed with UV spectrographs on the Hubble Space Telescope. The median {τ }{eff,{He}{{II}}} values increase gradually from 1.95 at z=2.7 to 5.17 at z=3.4, but with a strong sightline-to-sightl…
Radio AGN in the local universe: unification, triggering and evolution
Tadhunter, Clive
Associated with one of the most important forms of active galactic nucleus (AGN) feedback, and showing a strong preference for giant elliptical host galaxies, radio AGN (L_{1.4 GHz} > 10^{24} W Hz^{-1}) are a key sub-class of the overall AGN population. Recently their study has benefitted dramatically from the availability of high-quality data …
The Evolution of Galaxy Number Density at z < 8 and Its Implications
Conselice, Christopher J.; Mortlock, Alice; Wilkinson, Aaron +1 more
The evolution of the number density of galaxies in the universe, and thus also the total number of galaxies, is a fundamental question with implications for a host of astrophysical problems including galaxy evolution and cosmology. However, there has never been a detailed study of this important measurement, nor a clear path to answer it. To addre…
Origins of volatile elements (H, C, N, noble gases) on Earth and Mars in light of recent results from the ROSETTA cometary mission
Mousis, Olivier; Morbidelli, Alessandro; Altwegg, Kathrin +6 more
Recent measurements of the volatile composition of the coma of Comet 67P/Churyumov-Gerasimenko (hereafter 67P) allow constraints to be set on the origin of volatile elements (water, carbon, nitrogen, noble gases) in inner planets' atmospheres. Analyses by the ROSINA mass spectrometry system onboard the Rosetta spacecraft indicate that 67P ice has …
High-mass X-ray binaries in the Small Magellanic Cloud
Haberl, F.; Sturm, R.
Aims: The last comprehensive catalogue of high-mass X-ray binaries in the Small Magellanic Cloud (SMC) was published about ten years ago. Since then new such systems were discovered, mainly by X-ray observations with Chandra and XMM-Newton. For the majority of the proposed HMXBs in the SMC no X-ray pulsations were discovered as yet, and unles…