Search Publications
Galactic Bulges from Hubble Space Telescope Near-Infrared Camera Multi-Object Spectrometer Observations: The Lack of r1/4 Bulges
Balcells, Marc; Graham, Alister W.; Domínguez-Palmero, Lilian +1 more
We use Hubble Space Telescope (HST) near-infrared imaging to explore the shapes of the surface brightness profiles of bulges of S0-Sbc galaxies at high resolution. Modeling extends to the outer bulge via bulge-disk decompositions of combined HST-ground-based profiles. Compact, central unresolved components similar to those reported by others are f…
Alfvénic Turbulence in the Extended Solar Corona: Kinetic Effects and Proton Heating
Cranmer, S. R.; van Ballegooijen, A. A.
We present a model of magnetohydrodynamic (MHD) turbulence in the extended solar corona that contains the effects of collisionless dissipation and anisotropic particle heating. Recent observations have shown that preferential heating and acceleration of positive ions occur in the first few solar radii of the high-speed solar wind. Measurements mad…
A Spectroscopic Survey of Subarcsecond Binaries in the Taurus-Auriga Dark Cloud with the Hubble Space Telescope
Hartigan, Patrick; Kenyon, Scott J.
We report the results of a spectroscopic survey of 20 close T Tauri binaries in the Taurus-Auriga dark cloud where the separations between primaries and their secondaries are less than the typical size of a circumstellar disk around a young star. Analysis of low- and medium-resolution Space Telescope Imaging Spectrograph spectra yields the stellar…
Kinematic Masses of Super-Star Clusters in M82 from High-Resolution Near-Infrared Spectroscopy
Graham, James R.; McCrady, Nate; Gilbert, Andrea M.
Using high-resolution (R~22,000) near-infrared (1.51-1.75 µm) spectra from Keck Observatory, we measure the kinematic masses of two super-star clusters in M82. Cross-correlation of the spectra with template spectra of cool evolved stars gives stellar velocity dispersions of σr=15.9+/-0.8 km s-1 for J0955505+694045 (MGG-…
Chandra Observation of the Cooling Flow Cluster Abell 2052
Sarazin, Craig L.; McNamara, Brian R.; Blanton, Elizabeth L.
We present an analysis of the Chandra X-ray observation of A2052, including large-scale properties of the cluster as well as the central region, which includes the bright radio source 3C 317. We present temperature and abundance profiles using both projected and deprojected spectral analyses. The cluster shows the cooling flow signatures of excess…
A Hubble Space Telescope Survey of Extended [O III] λ5007 Å Emission in a Far-Infrared-Selected Sample of Seyfert Galaxies: Results
Pringle, J. E.; Hutchings, J. B.; Schmitt, H. R. +3 more
We present the results of a Hubble Space Telescope (HST) survey of extended [O III] emission in a sample of 60 nearby Seyfert galaxies (22 Seyfert 1's and 38 Seyfert 2's), selected by mostly isotropic properties. The comparison between the semimajor axis size of their [O III] emitting regions (Rmaj) shows that Seyfert 1's and Seyfert 2'…
Rapid Acceleration of a Coronal Mass Ejection in the Low Corona and Implications for Propagation
Gallagher, Peter T.; Dennis, Brian R.; Lawrence, Gareth R.
A high-velocity coronal mass ejection (CME) associated with the 2002 April 21 X1.5 flare is studied using a unique set of observations from the Transition Region and Coronal Explorer (TRACE), the Ultraviolet Coronagraph Spectrometer (UVCS), and the Large Angle and Spectroscopic Coronagraph (LASCO). The event is first observed as a rapid rise in GO…
Discovery of the Low-Redshift Optical Afterglow of GRB 011121 and Its Progenitor Supernova SN 2001ke
Infante, L.; Kirshner, R. P.; Garnavich, P. M. +10 more
We present the discovery and follow-up observations of the afterglow of the gamma-ray burst GRB 011121 and its associated supernova SN 2001ke. Images were obtained with the Optical Gravitational Lensing Experiment 1.3 m telescope in BVRI passbands, starting 10.3 hr after the burst. The temporal analysis of our early data indicates a steep decay, i…
Circumnuclear Dust in Nearby Active and Inactive Galaxies. II. Bars, Nuclear Spirals, and the Fueling of Active Galactic Nuclei
Pogge, Richard W.; Mulchaey, John S.; Martini, Paul +1 more
We present a detailed study of the relation between circumnuclear dust morphology, host-galaxy properties, and nuclear activity in nearby galaxies. We use our sample of 123 nearby galaxies with visible-near-infrared color maps from the Hubble Space Telescope to create well-matched, ``paired'' samples of 28 active and 28 inactive galaxies, as well …
A Dynamical Model for the Globular Cluster G1
Baumgardt, Holger; Makino, Junichiro; Hut, Piet +2 more
We present a comparison between the observational data on the kinematical structure of G1 in M31, obtained with the Hubble Space Telescope Wide Field Planetary Camera 2 and Space Telescope Imaging Spectrograph instruments, and the results of dynamical simulations carried out using the special purpose computer GRAPE-6. We have obtained good fits fo…