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An Integrated Picture of Star Formation, Metallicity Evolution, and Galactic Stellar Mass Assembly
Barger, A. J.; Cowie, L. L.
We present an integrated study of star formation and galactic stellar mass assembly from z = 0.05 to 1.5 and galactic metallicity evolution from z = 0.05 to 0.9 using a very large and highly spectroscopically complete sample selected by rest-frame NIR bolometric flux in the GOODS-N. We assume a Salpeter IMF and fit Bruzual & Charlot models to …
Warping of Saturn's magnetospheric and magnetotail current sheets
Coates, A. J.; Russell, C. T.; Dougherty, M. K. +5 more
The magnetotails of Jupiter and Earth are known to be hinged so that their orientation is controlled by the magnetic field of the planet at small distances and asymptotically approach the direction of the flow of the solar wind at large distances. In this paper we present Cassini observations showing that Saturn's magnetosphere is also similarly h…
Formation and distribution of benzene on Titan
Yelle, R. V.; Vuitton, V.; Cui, J.
We present a study of the formation and distribution of benzene (C6H6) on Titan. Analysis of the Cassini Mass Spectrometer (INMS) measurements of benzene densities on 12 Titan passes shows that the benzene signal exhibits an unusual time dependence, peaking ~20 s after closest approach, rather than at closest approach. We sho…
Study of Nonthermal Emission from SNR RX J1713.7-3946 with Suzaku
Petre, Robert; Kokubun, Motohide; Nakazawa, Kazuhiro +11 more
We present results obtained from a series of observations of the supernova remnant RX J1713.7-3946 by Suzaku. Hard X-rays have been detected up to ~40 keV. The hard X-ray spectra are described by a power law with photon indices of ~3.0, which is larger than those below 10 keV. The combination of the spatially integrated XIS and HXD spectra clearly…
Variation of the Martian ionospheric electron density from Mars Express radar soundings
Gurnett, D. A.; Morgan, D. D.; Plaut, J. J. +3 more
The Mars Advanced Radar for Subsurface and Ionospheric Sounding aboard Mars Express has been in operation for over 2 years. Between 14 August 2005 and 31 July 2007, we obtain 34,492 ionospheric traces, of which 14,060 yield electron density profiles and 12,291 yield acceptable fits to the Chapman ionospheric model. These results are used to study …
The luminosities and distance scales of type II Cepheid and RR Lyrae variables
van Leeuwen, Floor; Whitelock, Patricia A.; Feast, Michael W. +2 more
Infrared and optical absolute magnitudes are derived for the type II Cepheids κ Pav and VY Pyx using revised Hipparcos parallaxes and for κ Pav, V553 Cen and SW Tau from pulsational parallaxes. Revised Hipparcos and HST parallaxes for RR Lyrae agree satisfactorily and are combined in deriving absolute magnitudes. Phase-corrected J, H and Ks
X-ray hiccups from Sagittarius A* observed by XMM-Newton. The second brightest flare and three moderate flares caught in half a day
Genzel, R.; Hasinger, G.; Grosso, N. +13 more
Context: Our Galaxy hosts at its dynamical center Sgr A*, the closest supermassive black hole. Surprisingly, its luminosity is several orders of magnitude lower than the Eddington luminosity. However, the recent observations of occasional rapid X-ray flares from Sgr A* provide constraints on the accretion and radiation mechanisms at work close to …
An XMM-Newton study of the environments, particle content and impact of low-power radio galaxies
Hardcastle, M. J.; Croston, J. H.; Birkinshaw, M. +2 more
We present a detailed study of the environments of a sample of nine low-power [Fanaroff-Riley type I (FRI)] radio galaxies, based on new and archival XMM-Newton observations. We report new detections of group-scale environments around three radio galaxies: 3C296, NGC1044 and 3C76.1. As with previous studies, we find that FRI radio galaxies inhabit…
Combining Lens Distortion and Depletion to Map the Mass Distribution of A1689
Broadhurst, Tom; Umetsu, Keiichi
We derive a projected 2D mass map of the well-studied galaxy cluster A1689 based on an entropy-regularized maximum likelihood combination of the lens magnification and distortion of red background galaxies registered in deep Subaru images. The method is not restricted to the weak regime but applies to the whole area outside the tangential critical…
Properties of magnetosheath mirror modes observed by Cluster and their response to changes in plasma parameters
Dandouras, Iannis; Lucek, Elizabeth; Soucek, Jan
Mirror modes are large amplitude nonpropagating compressive structures frequently observed in the magnetosheath. They appear in the form of quasi-sinusoidal oscillations in the magnetic field, profound magnetic decreases (dips) or magnetic enhancements (peaks), accompanied by a corresponding anticorrelated signature in plasma density. In this stud…