Search Publications
The size and albedo of Rosetta fly-by target 21 Lutetia from new IRTF measurements and thermal modeling
Hora, J. L.; Mueller, M.; Adams, J. D. +3 more
Recent spectroscopic observations indicate that the M-type asteroid 21 Lutetia has a primitive, carbonaceous-chondrite-like (C-type) surface composition for which a low geometric albedo would be expected; this is incompatible with the IRAS albedo of 0.221± 0.020. From new thermal-infrared spectrophotometric measurements and detailed thermophysical…
Far-Ultraviolet and X-Ray Observations of VV 114: Feedback in a Local Analog to Lyman Break Galaxies
Ptak, A.; Meurer, G.; Aloisi, A. +4 more
We have analyzed Far Ultraviolet Spectroscopic Explorer (FUSE), XMM-Newton, and Chandra observations of VV 114, a local galaxy merger with strong similarities to typical high-redshift Lyman break galaxies (LBGs). Diffuse thermal X-ray emission encompassing VV 114 has been observed by Chandra and XMM-Newton. This region of hot (kT~0.59 keV) gas has…
Characteristics of Jovian morning bright FUV aurora from Hubble Space Telescope/Space Telescope Imaging Spectrograph imaging and spectral observations
Clarke, J. T.; Cowley, S. W. H.; Grodent, D. +3 more
Observation of an exceptionally bright (peaking at ∼1.8 MR) Jovian auroral morning arc was obtained with the Space Telescope Imaging Spectrograph (STIS) on 21 September 1999, both in the imaging and spectral modes. The images of the HST orbit are used to describe the variation of the position of the bright arc, while the time-tagged spectra are ex…
Tracking Large-Scale Propagating Coronal Wave Fronts (EIT Waves) using Automated Methods
Wills-Davey, M. J.
Recently developed mapping algorithms allow automated tracking of a propagating coronal wave, enabling the finding of reproducible fronts and propagation trajectories. Coronal observations taken by the Transition Region and Coronal Explorer (TRACE) on 1998 June 13 show a large-scale bright wave front, comparable to ``EIT waves'' seen with the Extr…
Dynamics and evolution of an eruptive flare
Maltagliati, L.; Teriaca, L.; Falchi, A. +2 more
Aims.We study the dynamics and the evolution of a C2.3 two-ribbon flare, developed on 2002 August 11, during the impulsive phase as well as during the long gradual phase. To this end we obtained multiwavelength observations using the CDS spectrometer aboard SOHO, facilities at the National Solar Observatory/Sacramento Peak, and the TRACE and RHESS…
The absolute motion of the peculiar cluster NGC 6791
Anderson, J.; Bedin, L. R.; King, I. R. +2 more
We present improved values of the three components of the absolute space velocity of the open cluster NGC 6791. One HST ACS/WFC field with two-epoch observations provides astrometric measurements of objects in a field containing the cluster center. Identification of 60 background galaxies with sharp nuclei allows us to determine an absolute refere…
The Dynamical State and Blue Straggler Population of the Globular Cluster NGC 6266 (M62)
Valenti, E.; Possenti, A.; Beccari, G. +3 more
We have used a proper combination of multiband high-resolution Hubble Space Telescope WFPC2 and wide-field ground-based observations to image the Galactic globular cluster NGC 6266 (M62). The extensive photometric data set allows us to determine the center of gravity and to construct the most extended radial profile ever published for this cluster…
Observations of the intense and ultra-long burst GRB 041219a with the Germanium spectrometer on INTEGRAL
McGlynn, S.; McBreen, S.; Foley, S. +5 more
Context.GRB 041219a is the brightest burst localised by INTEGRAL. The peak flux of 43 ph cm-2 s-1 (1.84 × 10-5 erg cm-2 s-1, 20 keV-8 MeV, 1 s integration) is greater than that for ~98% of all bursts and the T_90 duration of ~186 s (~20 keV-8 MeV) is longer than all but a small number of burst…
A Spitzer Study of Comets 2P/Encke, 67P/Churyumov-Gerasimenko, and C/2001 HT50 (LINEAR-NEAT)
Gehrz, Robert D.; Woodward, Charles E.; Pittichová, Jana +8 more
We present infrared images and spectra of comets 2P/Encke, 67P/Churyumov-Gerasimenko, and C/2001 HT50 (LINEAR-NEAT) as part of a larger program to observe comets inside of 5 AU from the Sun with the Spitzer Space Telescope. The nucleus of comet 2P/Encke was observed at two vastly different phase angles (20° and 63°). Model fits to the spectral ene…
A close look into the carbon disk at the core of the planetary nebula CPD-56°8032
Wolf, S.; Lopez, B.; Collioud, A. +7 more
Aims.We present high spatial resolution observations of the dusty core of the Planetary Nebula with Wolf-Rayet central star CPD-56°8032, for which indications of a compact disk have been found by HST/SITS observations.
Methods: .These observations were taken with the mid-infrared interferometer VLTI/MIDI in imaging mode providing a typical 30…