Search Publications
Precise mass determination and the nature of Phobos
Pätzold, M.; Rosenblatt, P.; Häusler, B. +4 more
We report independent results from two subgroups of the Mars Express Radio Science (MaRS) team who independently analyzed Mars Express (MEX) radio tracking data for the purpose of determining consistently the gravitational attraction of the moon Phobos on the MEX spacecraft, and hence the mass of Phobos. New values for the gravitational parameter …
H+ and O+ content of the plasma sheet at 15-19 Re as a function of geomagnetic and solar activity
Dandouras, I.; Klecker, B.; Kistler, L. M. +3 more
We have used the ion composition data from the CIS/CODIF instrument on the Cluster spacecraft to determine how the H+ and O+ contribution to the plasma sheet density changes as a function of geomagnetic conditions and solar activity. The Cluster spacecraft are in a polar orbit that cut through the equatorial plasma sheet at ∼…
Which Galaxies Host Bars and Disks? A Study of the Coma Cluster
Aguerri, J. A. L.; Sánchez-Janssen, R.; Méndez-Abreu, J.
We present a study of the bar fraction in the Coma Cluster galaxies based on a sample of ~190 galaxies selected from the Sloan Digital Sky Survey Data Release 6 and observed with the Hubble Space Telescope (HST) Advanced Camera for Survey (ACS). The unprecedented resolution of the HST-ACS images allows us to explore the presence of bars, detected …
Palaeoflow reconstruction from fan delta morphology on Mars
Hauber, Ernst; Kleinhans, Maarten G.; van de Kasteele, Hester E.
Alluvial fans and deltas on Mars record past hydrological conditions. Until now these conditions have been inferred from the morphology of the feeder channels and the deposits from images and digital terrain models (DTMs), and from calculations of the bulk fluxes of water and sediment based on the dimensions of upstream channels. Neither method ca…
COBE and the Galactic Interstellar Medium: Geometry of the Spiral Arms from FIR Cooling Lines
Wolfire, Mark; Hollenbach, David; Steiman-Cameron, Thomas Y.
We present a new model for the spiral structure of the Milky Way based upon the essentially all-sky intensity maps of the [C II] 158 µm and [N II] 205 µm lines of the interstellar medium (ISM) obtained by the FIRAS instrument of the Cosmic Background Explorer (COBE), with ancillary data from the Balloon-borne Infrared Carbon Explorer, …
Supernova Remnants and the Interstellar Medium of M83: Imaging and Photometry with the Wide Field Camera 3 on the Hubble Space Telescope
Mutchler, Max; Windhorst, Rogier; Blair, William P. +23 more
We present Wide Field Camera 3 images taken with the Hubble Space Telescope within a single field in the southern grand design star-forming galaxy M83. Based on their size, morphology, and photometry in continuum-subtracted Hα, [S II], Hβ, [O III], and [O II] filters, we have identified 60 supernova remnant (SNR) candidates, as well as a handful o…
A model of force balance in Saturn's magnetodisc
Arridge, C. S.; Achilleos, N.; Guio, P.
We present calculations of magnetic potential functions associated with the perturbation of Saturn's planetary magnetic field by a rotating, equatorially situated disc of plasma. Such structures are central to the dynamics of the rapidly rotating magnetospheres of Saturn and Jupiter. They are `fed' internally by sources of plasma from moons such a…
The Luminosity Function of Lyα Emitters at Redshift z = 7.7
Finkelstein, Steven L.; Dickinson, Mark; Tilvi, Vithal +8 more
Lyα emission lines should be attenuated in a neutral intergalactic medium. Therefore, the visibility of Lyα emitters at high redshifts can serve as a valuable probe of reionization at about the 50% level. We present an imaging search for z = 7.7 Lyα emitting galaxies using an ultra-narrowband filter (filter width = 9 Å) on the NEWFIRM imager at th…
Distance determination for RAVE stars using stellar models
Gilmore, G.; Freeman, K. C.; Munari, U. +21 more
Aims: We develop a method for deriving distances from spectroscopic data and obtaining full 6D phase-space coordinates for the RAVE survey's second data release.
Methods: We used stellar models combined with atmospheric properties from RAVE (effective temperature, surface gravity and metallicity) and (J-Ks) photometry from arc…
Looking Into the Hearts of Bok Globules: Millimeter and Submillimeter Continuum Images of Isolated Star-forming Cores
Wolf, S.; Henning, Th.; Ward-Thompson, D. +6 more
We present the results of a comprehensive infrared, submillimeter, and millimeter continuum emission study of isolated low-mass star-forming cores in 32 Bok globules, with the aim to investigate the process of star formation in these regions. The submillimeter and millimeter dust continuum emission maps together with the spectral energy distributi…