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Anatomy of the AGN in NGC 5548. I. A global model for the broadband spectral energy distribution
Kaastra, J. S.; Harrison, F. A.; Kriss, G. A. +24 more
An extensive multi-satellite campaign on NGC 5548 has revealed this archetypal Seyfert-1 galaxy to be in an exceptional state of persistent heavy absorption. Our observations taken in 2013-2014 with XMM-Newton, Swift, NuSTAR, INTEGRAL, Chandra, HST and two ground-based observatories have together enabled us to establish that this unexpected phenom…
The SL2S Galaxy-scale Lens Sample. V. Dark Matter Halos and Stellar IMF of Massive Early-type Galaxies Out to Redshift 0.8
Treu, Tommaso; Gavazzi, Raphaël; Marshall, Philip J. +4 more
We investigate the cosmic evolution of the internal structure of massive early-type galaxies over half of the age of the universe. We perform a joint lensing and stellar dynamics analysis of a sample of 81 strong lenses from the Strong Lensing Legacy Survey and Sloan ACS Lens Survey and combine the results with a hierarchical Bayesian inference me…
The search for failed supernovae with the Large Binocular Telescope: first candidates
Kochanek, C. S.; Stanek, K. Z.; Gerke, J. R.
We are monitoring 27 galaxies within 10 Mpc using the Large Binocular Telescope to search for failed supernovae (SNe), massive stars that collapse to form a black hole without an SN explosion. We present the results from the first 4 yr of survey data, during which these galaxies were observed to produce three successful core-collapse SNe. We searc…
GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology
Zhang, Jun; Hogg, David W.; Gavazzi, Raphaël +40 more
We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included simulated space- and …
The VLT-FLAMES Tarantula Survey. XXII. Multiplicity properties of the B-type stars
Howarth, I. D.; Dufton, P. L.; Simón-Díaz, S. +7 more
We investigate the multiplicity properties of 408 B-type stars observed in the 30 Doradus region of the Large Magellanic Cloud with multi-epoch spectroscopy from the VLT-FLAMES Tarantula Survey (VFTS). We use a cross-correlation method to estimate relative radial velocities from the helium and metal absorption lines for each of our targets. Object…
Growth of cosmic structure: Probing dark energy beyond expansion
Mandelbaum, Rachel; Sehgal, Neelima; Connolly, Andrew +18 more
The quantity and quality of cosmic structure observations have greatly accelerated in recent years, and further leaps forward will be facilitated by imminent projects. These will enable us to map the evolution of dark and baryonic matter density fluctuations over cosmic history. The way that these fluctuations vary over space and time is sensitive…
Full-Sun observations for identifying the source of the slow solar wind
Warren, Harry P.; Ugarte-Urra, Ignacio; Brooks, David H.
Fast (>700 km s-1) and slow (~400 km s-1) winds stream from the Sun, permeate the heliosphere and influence the near-Earth environment. While the fast wind is known to emanate primarily from polar coronal holes, the source of the slow wind remains unknown. Here we identify possible sites of origin using a slow solar wind s…
Gravitational Lens Modeling with Basis Sets
Amara, Adam; Refregier, Alexandre; Birrer, Simon
We present a strong lensing modeling technique based on versatile basis sets for the lens and source planes. Our method uses high performance Monte Carlo algorithms, allows for an adaptive build up of complexity, and bridges the gap between parametric and pixel based reconstruction methods. We apply our method to a Hubble Space Telescope image of …
A statistical study of EMIC waves observed by Cluster: 1. Wave properties
André, M.; Klecker, B.; Kistler, L. M. +6 more
Electromagnetic ion cyclotron (EMIC) waves are an important mechanism for particle energization and losses inside the magnetosphere. In order to better understand the effects of these waves on particle dynamics, detailed information about the occurrence rate, wave power, ellipticity, normal angle, energy propagation angle distributions, and local …
A Massive, Distant Proto-cluster at z = 2.47 Caught in a Phase of Rapid Formation?
Sanders, D. B.; Treister, E.; Cooray, A. +6 more
Numerical simulations of cosmological structure formation show that the universe’s most massive clusters, and the galaxies living in those clusters, assemble rapidly at early times (2.5\lt z\lt 4). While more than 20 proto-clusters have been observed at z≳ 2 based on associations of 5-40 galaxies around rare sources, the observational evidence for…