Search Publications
FMOS near-IR spectroscopy of Herschel-selected galaxies: star formation rates, metallicity and dust attenuation at z ∼ 1
Clements, D. L.; Dunlop, J. S.; Buat, V. +36 more
We investigate the properties (e.g. star formation rate, dust attenuation, stellar mass and metallicity) of a sample of infrared (IR) luminous galaxies at z ∼ 1 via near-IR spectroscopy with Subaru-FMOS. Our sample consists of Herschel SPIRE and Spitzer MIPS selected sources in the COSMOS field with photometric redshifts in the range of 0.7 < z…
Detecting the Warm-Hot Intergalactic Medium through X-Ray Absorption Lines
Shull, J. Michael; Wang, Q. Daniel; Yao, Yangsen +1 more
The warm-hot intergalactic medium (WHIM) at temperatures 105-107 K is believed to contain 30%-50% of the baryons in the local universe. However, all current X-ray detections of the WHIM at redshifts z > 0 are of low statistical significance (lsim 3σ) and/or controversial. In this work, we aim to establish the detection lim…
Far-ultraviolet Continuum Emission: Applying This Diagnostic to the Chromospheres of Solar-mass Stars
France, Kevin; Linsky, Jeffrey L.; Ayres, Tom +2 more
The far-ultraviolet (FUV) continuum flux is recognized as a very sensitive diagnostic of the temperature structure of the Sun's lower chromosphere. Until now analysis of the available stellar FUV data has shown that solar-type stars must also have chromospheres, but quantitative analyses of stellar FUV continua require far higher quality spectra a…
Investigation of Intermittency in Magnetohydrodynamics and Solar Wind Turbulence: Scale-dependent Kurtosis
Oughton, Sean; Matthaeus, William H.; Wan, Minping +1 more
The behavior of scale-dependent (or filtered) kurtosis is studied in the solar wind using magnetic field measurements from the ACE and Cluster spacecraft at 1 AU. It is also analyzed numerically with high-resolution magnetohydrodynamic spectral simulations. In each case the filtered kurtosis increases with wavenumber, implying the presence of cohe…
SHARP - I. A high-resolution multiband view of the infrared Einstein ring of JVAS B1938+666
Vegetti, S.; McKean, J. P.; Auger, M. W. +3 more
We present new mass models for the gravitational lens system B1938+666, using multiwavelength data acquired from Keck adaptive optics (AO) and Hubble Space Telescope (HST) observations. These models are the first results from the Strong lensing at High Angular Resolution Program (SHARP), a project designed to study known quadruple image and Einste…
Absorption Features in the X-ray Spectrum of an Ordinary Radio Pulsar
Pavlov, George G.; Kargaltsev, Oleg; Durant, Martin +1 more
The vast majority of known nonaccreting neutron stars (NSs) are rotation-powered radio and/or γ-ray pulsars. So far, their multiwavelength spectra have all been described satisfactorily by thermal and nonthermal continuum models, with no spectral lines. Spectral features have, however, been found in a handful of exotic NSs and were thought to be a…
Surface waves on Saturn's magnetopause
Coates, A. J.; Dougherty, M. K.; Jones, G. H. +3 more
Waves on the surface of a planetary magnetopause promote energy transport into the magnetosphere, representing an important aspect of solar wind-magnetosphere coupling. At Saturn's magnetopause it has been proposed that growth of the Kelvin-Helmholtz (K-H) instability produces greater wave activity on the dawn side of the surface than on the dusk …
Ground-based observations of the long-term evolution and death of Saturn's 2010 Great White Spot
Hueso, Ricardo; del Río-Gaztelurrutia, Teresa; Sánchez-Lavega, Agustín +8 more
We report on the long-term evolution of Saturn's sixth Great White Spot (GWS) event that initiated at northern mid-latitudes of the planet on December 5th, 2010 (Fletcher, L. et al. [2011]. Science 332, 1413-1417; Sánchez-Lavega, A. et al. [2011]. Nature 475, 71-74; Fischer, G. et al. [2011]. Nature 475, 75-77). We find from ground-based observati…
The Emission of Cygnus X-1: Observations with INTEGRAL SPI from 20 keV to 2 MeV
Malzac, J.; Jourdain, E.; Roques, J. P.
We report on Cyg X-1 observations performed by the SPI telescope on board the INTEGRAL mission and distributed over more than 6 years. We investigate the variability of the intensity and spectral shape of this peculiar source in the hard X-ray domain, and more particularly up to the MeV region. We first study the total averaged spectrum which pres…
Suzaku Observations of 4U 1957+11: Potentially the Most Rapidly Spinning Black Hole in (the Halo of) the Galaxy
Pottschmidt, Katja; Wilms, Jörn; Nowak, Michael A. +3 more
We present three Suzaku observations of the black hole candidate 4U 1957+11 (V1408 Aql)—a source that exhibits some of the simplest and cleanest examples of soft, disk-dominated spectra. 4U 1957+11 also presents among the highest peak temperatures found from disk-dominated spectra. Such temperatures may be associated with rapid black hole spin. Th…