Search Publications
Geology and composition of the Orientale Basin impact melt sheet
Spudis, Paul D.; Martin, Dayl J. P.; Kramer, Georgiana
Orientale Basin is one of the largest (930 km diameter) and youngest (~3.8 Ga) impact craters on the Moon. As the basin is only partly flooded by mare lava, its floor materials expose a major portion of the basin impact melt sheet, which some previous work has suggested might have undergone igneous differentiation. To test this idea, we remapped t…
Neptune at summer solstice: Zonal mean temperatures from ground-based observations, 2003-2007
de Pater, Imke; Fletcher, Leigh N.; Irwin, Patrick G. J. +3 more
Imaging and spectroscopy of Neptune's thermal infrared emission from Keck/LWS (2003), Gemini-N/MICHELLE (2005); VLT/VISIR (2006) and Gemini-S/TReCS (2007) is used to assess seasonal changes in Neptune's zonal mean temperatures between Voyager-2 observations (1989, heliocentric longitude Ls = 236 °) and southern summer solstice (2005, L<…
Supernova 2010as: The Lowest-velocity Member of a Family of Flat-velocity Type IIb Supernovae
Morrell, Nidia; Nomoto, Ken'ichi; Phillips, Mark M. +23 more
We present extensive optical and near-infrared photometric and spectroscopic observations of the stripped-envelope supernova SN 2010as. Spectroscopic peculiarities such as initially weak helium features and low expansion velocities with a nearly flat evolution place this object in the small family of events previously identified as transitional Ty…
Mapping the electron energy in Jupiter's aurora: Hubble spectral observations
Bonfond, B.; Clarke, J. T.; Waite, J. H. +6 more
Far ultraviolet spectral observations have been made with the Hubble Space Telescope in the time-tag mode using the Space Telescope Imaging Spectrograph (STIS) long slit. The telescope was slewed in such a way that the slit projection scanned from above the polar limb down to midlatitudes, allowing us to build up the first spectral maps of the FUV…
Planck 2013 results. III. LFI systematic uncertainties
Bernard, J. -P.; Planck Collaboration; Aghanim, N. +218 more
We present the current estimate of instrumental and systematic effect uncertainties for the Planck-Low Frequency Instrument relevant to the first release of the Planck cosmological results. We give an overview of the main effects and of the tools and methods applied to assess residuals in maps and power spectra. We also present an overall budget o…
A resolved analysis of cold dust and gas in the nearby edge-on spiral NGC 891
Clements, D. L.; Boquien, M.; Bianchi, S. +18 more
We investigate the connection between dust and gas in the nearby edge-on spiral galaxy NGC 891, a target of the Very Nearby Galaxies Survey. High resolution Herschel PACS and SPIRE 70, 100, 160, 250, 350, and 500 µm images are combined with JCMT SCUBA 850 µm observations to trace the far-infrared/submillimetre spectral energy distribut…
Fast and Furious: Shock Heated Gas as the Origin of Spatially Resolved Hard X-Ray Emission in the Central 5 kpc of the Galaxy Merger NGC 6240
Elvis, Martin; Zezas, Andreas; Risaliti, Guido +7 more
We have obtained a deep, subarcsecond resolution X-ray image of the nuclear region of the luminous galaxy merger NGC 6240 with Chandra, which resolves the X-ray emission from the pair of active nuclei and the diffuse hot gas in great detail. We detect extended hard X-ray emission from kT ~ 6 keV (~70 MK) hot gas over a spatial scale of 5 kpc, indi…
C/O Abundance Ratios, Iron Depletions, and Infrared Dust Features in Galactic Planetary Nebulae
Delgado-Inglada, Gloria; Rodríguez, Mónica
We study the dust present in 56 Galactic planetary nebulae (PNe) through their iron depletion factors, their C/O abundance ratios (in 51 objects), and the dust features that appear in their infrared spectra (for 33 objects). Our sample objects have deep optical spectra of good quality, and most of them also have ultraviolet observations. We use th…
The age distribution of stellar clusters in M83.
Fouesneau, M.; Bastian, N.; Adamo, A. +2 more
In order to empirically determine the time-scale and environmental dependence of stellar cluster disruption, we have undertaken an analysis of the unprecedented multipointing (seven), multiwavelength (U, B, V, Hα, and I) Hubble Space Telescope imaging survey of the nearby, face-on spiral galaxy M83. The images are used to locate stellar clusters a…
The temperature dependence of the far-infrared-radio correlation in the Herschel-ATLAS
de Zotti, G.; Ibar, E.; Vaccari, M. +12 more
We use 10 387 galaxies from the Herschel Astrophysical TeraHertz Large Area Survey (H-ATLAS) to probe the far-infrared radio correlation (FIRC) of star-forming galaxies as a function of redshift, wavelength, and effective dust temperature. All of the sources in our 250 µm-selected sample have spectroscopic redshifts, as well as 1.4 GHz flux …