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Twenty-Three High-Redshift Supernovae from the Institute for Astronomy Deep Survey: Doubling the Supernova Sample at z > 0.7
Filippenko, Alexei V.; Wainscoat, Richard J.; Garnavich, Peter +29 more
We present photometric and spectroscopic observations of 23 high-redshift supernovae (SNe) spanning a range of z=0.34-1.03, nine of which are unambiguously classified as Type Ia. These SNe were discovered during the IfA Deep Survey, which began in 2001 September and observed a total of 2.5 deg2 to a depth of approximately m~25-26 in RIZ…
The Cassini Radio and Plasma Wave Investigation
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +27 more
The Cassini radio and plasma wave investigation is designed to study radio emissions, plasma waves, thermal plasma, and dust in the vicinity of Saturn. Three nearly orthogonal electric field antennas are used to detect electric fields over a frequency range from 1 Hz to 16 MHz, and three orthogonal search coil magnetic antennas are used to detect …
MeV Dark Matter: Has It Been Detected?
Silk, Joseph; Hooper, Dan; Paul, Jacques +2 more
We discuss the possibility that the recent detection of 511keV γ rays from the galactic bulge, as observed by INTEGRAL, is a consequence of low mass (1 100 MeV) particle dark matter annihilations. We discuss the type of halo profile favored by the observations as well as the size of the annihilation cross section needed to account for the signal. …
The Absence of Crystalline Silicates in the Diffuse Interstellar Medium
Tielens, A. G. G. M.; Kemper, F.; Vriend, W. J.
Infrared spectroscopy provides a direct handle on the composition and structure of interstellar dust. We have studied the dust along the line of sight toward the Galactic center using Short Wavelength Spectrometer data obtained with the Infrared Space Observatory (ISO). We focused on the wavelength region from 8 to 13 µm, which is dominated …
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…