Search Publications
Early Formation of Dust in the Ejecta of Type Ib SN 2006jc and Temperature and Mass of the Dust
Onaka, Takashi; Sakon, Itsuki; Tominaga, Nozomu +8 more
SN 2006jc is a peculiar supernova (SN), in which the formation of dust has been confirmed at an early epoch of ~50 days after the explosion. We investigate the possibility of such an early formation of dust grains in the expanding ejecta of SN 2006jc, applying the Type Ib SN model that is developed to reproduce the observed light curve. We find th…
Auroral evidence of a localized magnetic anomaly in Jupiter's northern hemisphere
Gustin, Jacques; Clarke, John T.; Connerney, John E. P. +5 more
We analyze more than 1000 HST/Advanced Camera for Survey images of the ultraviolet auroral emissions appearing in the northern hemisphere of Jupiter. The auroral footprints of Io, Europa, and Ganymede form individual footpaths, which are fitted with three reference contours. The satellite footprints provide a convenient mapping between the norther…
The multiple quasar Q2237+0305 under a microlensing caustic
Schmidt, R. W.; Anguita, T.; Wambsganss, J. +5 more
We use the high magnification event seen in the 1999 OGLE campaign light curve of image C of the quadruply imaged gravitational lens Q2237+0305 to study the structure of the quasar engine. We have obtained g'- and r'-band photometry at the Apache Point Observatory 3.5 m telescope where we find that the event has a smaller amplitude in the r'-band …
The Sloan Digital Sky Survey Quasar Lens Search. II. Statistical Lens Sample from the Third Data Release
Castander, Francisco J.; Hennawi, Joseph F.; White, Richard L. +31 more
We report the first results of our systematic search for strongly lensed quasars using the spectroscopically confirmed quasars in the Sloan Digital Sky Survey (SDSS). Among 46,420 quasars from the SDSS Data Release 3 (~4188 deg2), we select a subsample of 22,683 quasars that are located at redshifts between 0.6 and 2.2 and are brighter …
The Massive Star Content of NGC 3603
Massey, Philip; Morrell, Nidia I.; Melena, Nicholas W. +1 more
We investigate the massive star content of NGC 3603, the closest known giant H II region. We have obtained spectra of 26 stars in the central cluster using the Baade 6.5 m telescope (Magellan I). Of these 26 stars, 16 had no previous spectroscopy. We also obtained photometry of all of the stars with previous or new spectroscopy, primarily using ar…
Starburst Intensity Limit of Galaxies at z simeq 5-6
Hathi, N. P.; Malhotra, S.; Rhoads, J. E.
The peak star formation intensity in starburst galaxies does not vary significantly from the local universe to redshift z ~ 6. We arrive at this conclusion through new surface brightness measurements of 47 starburst galaxies at z simeq 5-6, doubling the redshift range for such observations. These galaxies are spectroscopically confirmed in the Hub…
Evolution and depositional environments of the Eberswalde fan delta, Mars
Hauber, Ernst; Pondrelli, Monica; Rossi, Angelo Pio +4 more
The Eberswalde crater and its contributing basins have been analyzed in detail in order to reconstruct the geological evolution of the water-related landforms with particular focus on the Eberswalde delta-like feature. Based on a complex strata organization characterized by a topset-foreset-bottomset geometry, typical of delta progradation on Eart…
Mineralogy of Terra Meridiani and western Arabia Terra from OMEGA/MEx and implications for their formation
Bibring, J. -P.; Arvidson, R. E.; Gondet, B. +5 more
Analyses of Mars Express OMEGA hyperspectral data (0.4-2.7 µm) for Terra Meridiani and western Arabia Terra show that the northern mantled cratered terrains are covered by dust that is spectrally dominated by nanophase ferric oxides. Dark aeolian dunes inside craters and dark streaks extending from the dunes into the intercrater areas in man…
Density of neutral interstellar hydrogen at the termination shock from Ulysses pickup ion observations
Möbius, E.; Bzowski, M.; Gloeckler, G. +2 more
Aims: By reevaluating a 13-month stretch of Ulysses SWICS H pickup ion measurements near 5 AU close to the ecliptic right after the previous solar minimum, this paper presents a determination of the neutral interstellar H density at the solar wind termination shock and implications for the density and ionization degree of hydrogen in the local int…
Evidence for reconnection at Saturn's magnetopause
Coates, A. J.; Dougherty, M. K.; Thomsen, M. F. +4 more
Observations of Saturn's magnetopause by the Cassini Plasma Spectrometer (CAPS) and magnetometer have revealed clear instances of magnetic reconnection signatures, two of which are described here. Both encounters occurred at the equator in the prenoon sector as Cassini was exiting the magnetosphere. Evidence of heating in the electrons and ions is…