Search Publications
The SAURON project - III. Integral-field absorption-line kinematics of 48 elliptical and lenticular galaxies
Krajnović, Davor; Emsellem, Eric; Miller, Bryan W. +9 more
We present the stellar kinematics of 48 representative elliptical and lenticular galaxies obtained with our custom-built integral-field spectrograph SAURON operating on the William Herschel Telescope. The data were homogeneously processed through a dedicated reduction and analysis pipeline. All resulting SAURON data cubes were spatially binned to …
Cassini Plasma Spectrometer Investigation
Coates, A. J.; Linder, D. R.; Grande, M. +55 more
The Cassini Plasma Spectrometer (CAPS) will make comprehensive three-dimensional mass-resolved measurements of the full variety of plasma phenomena found in Saturn’s magnetosphere. Our fundamental scientific goals are to understand the nature of saturnian plasmas primarily their sources of ionization, and the means by which they are accelerated, t…
Global-Scale Turbulent Convection and Magnetic Dynamo Action in the Solar Envelope
Toomre, Juri; Brun, Allan Sacha; Miesch, Mark S.
The operation of the solar global dynamo appears to involve many dynamical elements, including the generation of fields by the intense turbulence of the deep convection zone, the transport of these fields into the tachocline region near the base of the convection zone, the storage and amplification of toroidal fields in the tachocline by different…
The Cassini Magnetic Field Investigation
Russell, C. T.; Dougherty, M. K.; Balogh, A. +10 more
The dual technique magnetometer system onboard the Cassini orbiter is described. This instrument consists of vector helium and fluxgate magnetometers with the capability to operate the helium device in a scalar mode. This special mode is used near the planet in order to determine with very high accuracy the interior field of the planet. The orbita…
Is the soft excess in active galactic nuclei real?
Done, Chris; Gierliński, Marek
We systematically analyse all publicly available XMM-Newton spectra of radio-quiet PG quasars. The soft X-ray excess in these objects is well modelled by an additional, cool, Compton scattering region. However, the remarkably constant temperature derived for this component over the whole sample requires a puzzling fine tuning of the parameters. In…
The Rest-Frame Ultraviolet Luminosity Density of Star-forming Galaxies at Redshifts z>3.5
Gardner, Jonathan P.; Stern, D.; Dickinson, M. +12 more
We have measured the rest-frame λ~1500 Å comoving specific luminosity density of star-forming galaxies at redshift 3.5<z<6.5 (Lyman break galaxies [LBGs]) selected from deep, multiband images taken with the Hubble Space Telescope and the Advanced Camera for Surveys, obtained as part of the Great Observatories Origins Deep Survey (GOODS). The…
Solar chromospheric spicules from the leakage of photospheric oscillations and flows
De Pontieu, Bart; Erdélyi, Robert; James, Stewart P.
Spicules are dynamic jets propelled upwards (at speeds of ~20kms-1) from the solar `surface' (photosphere) into the magnetized low atmosphere of the Sun. They carry a mass flux of 100 times that of the solar wind into the low solar corona. With diameters close to observational limits (< 500km), spicules have been largely unexplained …
X-ray astronomy of stellar coronae
Güdel, Manuel
X-ray emission from stars in the cool half of the Hertzsprung-Russell diagram is generally attributed to the presence of a magnetic corona that contains plasma at temperatures exceeding 1 million K. Coronae are ubiquitous among these stars, yet many fundamental mechanisms operating in their magnetic fields still elude an interpretation through a d…
Massive Dark Matter Halos and Evolution of Early-Type Galaxies to z ~ 1
Treu, Tommaso; Koopmans, Léon V. E.
The combination of gravitational lensing and stellar dynamics breaks the mass-anisotropy degeneracy and provides stringent constraints on the distribution of luminous and dark matter in early-type (E/S0) galaxies out to z~1. We present new observations and models of three lens systems (CFRS 03.1077, HST 14176+5226, HST 15433+5352) and the combined…
GEMS: Galaxy Evolution from Morphologies and SEDs
Bell, Eric F.; Somerville, Rachel S.; Wisotzki, Lutz +13 more
GEMS (Galaxy Evolution from Morphologies and SEDs) is a large-area (800 arcmin2) two-color (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble Space Telescope. Centered on the Chandra Deep Field-South, it covers an area of ~28'×28', or about 120 Hubble Deep Field areas, to a depth o…