Search Publications
K-Band Spectroscopy of Compact Star Clusters in NGC 4038/4039
Lehnert, Matthew D.; Genzel, Reinhard; Thatte, Niranjan +2 more
Integral field spectroscopy in the K band (1.9-2.4 µm) was performed on four IR-bright star clusters and the two nuclei in NGC 4038/4039 (``the Antennae''). Two of the clusters are located in the overlap region of the two galaxies and together comprise ~25% of the total 15 µm emission of the total 4.8 GHz emission from this pair of mer…
IRAS 11590-6452 in BHR 71: A Binary Protostellar System?
Bourke, Tyler L.
New Anglo-Australian Telescope near-infrared and Swedish-ESO Submillimetre Telescope 12CO J=2-->1 observations are combined with existing Infrared Space Observatory mid-infrared and Australia Telescope Compact Array centimeter radio continuum observations to examine the protostellar content of the Bok globule BHR 71. Together with ob…
Spatially Resolved STIS Spectroscopy of α Orionis: Evidence for Nonradial Chromospheric Oscillation from Detailed Modeling
Lobel, A.; Dupree, A. K.
Four spatially resolved near-UV raster scans across the chromospheric disk of α Ori, obtained with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, reveal mean chromospheric infall from 1998 January to April, which reversed to upflow in deeper layers between 1998 September and 1999 March. In 1998 September we detect systemat…
Hubble Space Telescope Observations of SGR 0526-66: New Constraints on Accretion and Magnetar Models
Kulkarni, S. R.; van Kerkwijk, M. H.; Kaplan, D. L. +5 more
Soft γ-ray repeaters (SGRs) are among the most enigmatic sources known today. Exhibiting huge X-ray and γ-ray bursts and flares, as well as soft quiescent X-ray emission, their energy source remains a mystery. Just as mysterious are the anomalous X-ray pulsars (AXPs), which share many of the same characteristics. Thanks to recent Chandra X-Ray Obs…
Cold H2O and CO Ice and Gas toward the Galactic Center
Cernicharo, José; Moneti, Andrea; Pardo, Juan Ramón
We present ice- and gas-phase observations of CO, 13CO and of H2O in the mid- and far-infrared taken with the Infrared Space Observatory (ISO) short- and long-wavelength spectrometers toward two positions in the Galactic center region (Sagittarius A* and GCS 3). These data are complemented with Caltech Submillimeter Observato…
Large Doppler Shifts in X-Ray Plasma: An Explosive Start to Coronal Mass Ejection
Schwenn, R.; Curdt, W.; Innes, D. E. +3 more
We report observations, taken with the Solar Ultraviolet Measurements of Emitted Radiation spectrometer, of spatially resolved high red and blue Doppler shifts (up to 650 km s-1) from X-ray-emitting plasma in the corona above a flare. The high Doppler shifts are seen minutes after a fast, faint optical front is seen racing through the s…
Constraints on the O+5 Anisotropy in the Solar Corona
Ofman, L.; Gary, S. P.; Viñas, A.
Velocity distributions of O+5 ions derived from Ultraviolet Coronagraph Spectrometer (UVCS) observations in coronal holes indicate that the O+5 ions are highly anisotropic (T⊥i/T∥i~30-300 at 3.5 Rsolar). The observations provide empirical values for the electron density and the ion temperature…
A Search for the Damped Lyα Absorber at z=1.86 toward QSO 1244+3443 with NICMOS
Schneider, Glenn; Rieke, Marcia J.; Kulkarni, Varsha P. +5 more
We have carried out a high-resolution imaging search for the galaxy associated with the damped Lyα absorber (DLA) at z=1.859 toward the zem=2.48 quasar QSO 1244+3443, using the Hubble Space Telescope (HST) and the near-infrared camera and multiobject spectrometer (NICMOS). Images were obtained in the broad filter F160W and the narrow fi…
FUSE Observations of U Geminorum during Outburst and Decline
Long, Knox S.; Drew, Janet E.; Froning, Cynthia S. +2 more
We have obtained far-ultraviolet (904-1187 Å) spectra of U Gem in outburst with the Far Ultraviolet Spectroscopic Explorer. Three of the observations were acquired during the plateau phase of the outburst, while the fourth was obtained during late outburst decline. The plateau spectra have continuum shapes and fluxes that are approximated by stead…
Investigation of USNO-A2.0 Catalog Positions
Teixeira, R.; Assafin, M.; Camargo, J. I. B. +4 more
We present an investigation of the USNO-A2.0 Catalog positions. We have compared USNO-A2.0 positions with the Astrographic Catalogue-Tycho, with improved HST Guide Star Catalog positions in the ACT frame, and with International Celestial Reference Frame source positions and observational data from Valinhos CCD Meridian Circle, covering all the USN…