Search Publications
Magnetic Fields of the Satellites of Jupiter and Saturn
Khurana, Krishan K.; Kivelson, Margaret G.; Walker, Raymond J. +1 more
This paper reviews the present state of knowledge about the magnetic fields and the plasma interactions associated with the major satellites of Jupiter and Saturn. As revealed by the data from a number of spacecraft in the two planetary systems, the magnetic properties of the Jovian and Saturnian satellites are extremely diverse. As the only case …
Brightest Cluster Galaxies and Core Gas Density in REXCESS Clusters
Donahue, Megan; Voit, G. Mark; Pierini, Daniele +7 more
We investigate the relationship between brightest cluster galaxies (BCGs) and their host clusters using a sample of nearby galaxy clusters from the Representative XMM-Newton Cluster Structure Survey. The sample was imaged with the Southern Observatory for Astrophysical Research in R band to investigate the mass of the old stellar population. Using…
SHELS: Testing Weak-Lensing Maps with Redshift Surveys
Geller, Margaret J.; Kurtz, Michael J.; Dell'Antonio, Ian P. +2 more
Weak-lensing surveys are emerging as an important tool for the construction of "mass-selected" clusters of galaxies. We evaluate both the efficiency and completeness of a weak-lensing selection by combining a dense, complete redshift survey, the Smithsonian Hectospec Lensing Survey (SHELS), with a weak-lensing map from the Deep Lens Survey (DLS). …
Particle size and abundance of HC3N ice in Titan’s lower stratosphere at high northern latitudes
Achterberg, R. K.; Anderson, C. M.; Samuelson, R. E. +1 more
Up to now, there has been no corroboration from Cassini CIRS of the Voyager IRIS-discovery of cyanoacetylene (HC 3N) ice in Titan's thermal infrared spectrum. We report the first compelling spectral evidence from CIRS for the ν6 HC 3N ice feature at 506 cm -1 at latitudes 62°N and 70°N, from which we der…
Unveiling the σ-Discrepancy in Infrared-Luminous Mergers. I. Dust and Dynamics
Rothberg, Barry; Fischer, Jacqueline
Mergers in the local universe present a unique opportunity for studying the transformations of galaxies in detail. Presented here are recent results, based on multi-wavelength, high-resolution imaging and medium resolution spectroscopy, which demonstrate how star formation and the presence of red supergiants and/or asymptotic giant branch stars ha…
A multi-wavelength study of the young star V1118 Orionis in outburst
Audard, M.; Güdel, M.; Briggs, K. R. +6 more
Context. The accretion history of low-mass young stars is not smooth but shows spikes of accretion that can last from months and years to decades and centuries.
Aims: Observations of young stars in outbursts can help us understand the temporal evolution of accreting stars and the interplay between the accretion disk and the stellar magnetosph…
Dust tori in radio galaxies
Peletier, R. F.; Barthel, P. D.; van der Wolk, G. +1 more
Aims: We investigate the quasar - radio galaxy unification scenario and detect dust tori within radio galaxies of various types.
Methods: Using VISIR on the VLT, we acquired sub-arcsecond (~0.40 arcsec) resolution N-band images, at a wavelength of 11.85 µm, of the nuclei of a sample of 27 radio galaxies of four types in the redshif…
Evidence of Explosive Evaporation in a Microflare Observed by Hinode/EIS
Ding, M. D.; Chen, F.
We present a detailed study of explosive chromospheric evaporation during a microflare which occurred on 2007 December 7 as observed with the Extreme-ultraviolet Imaging Spectrometer on board Hinode. We find temperature-dependent upflows for lines formed from 1.0 to 2.5 MK and downflows for lines formed from 0.05 to 0.63 MK in the impulsive phase …
Librational response of Enceladus
Rambaux, Nicolas; Karatekin, Özgür; Castillo-Rogez, Julie C. +1 more
Physical librations could significantly contribute to Enceladus' geophysics through their influence on tidal stress. Therefore it is important to determine their behavior and the present paper is devoted to estimating Enceladus' libration in longitude. In a rotational model of Enceladus with no global ocean, we introduce the main perturbative term…
Evidence for Spatially Compact Lyα Emission in z = 3.1 Lyα-emitting Galaxies
Gronwall, Caryl; Gawiser, Eric; Ciardullo, Robin +3 more
We present the results of a high spatial resolution study of the line emission in a sample of z = 3.1 Lyα-emitting galaxies (LAEs) in the Extended Chandra Deep Field-South. Of the eight objects with coverage in our HST/WFPC2 narrowband imaging, two have clear detections and two are barely detected (~2 σ). The clear detections are within ~0.5 kpc o…