Search Publications
A SINFONI View of Galaxy Centers: Morphology and Kinematics of Five Nuclear Star Formation-Rings
Böker, Torsten; Schinnerer, Eva; Falcón-Barroso, Jesús +2 more
We present near-infrared (H- and K-band) integral-field observations of the circumnuclear star formation rings in five nearby spiral galaxies. The data, obtained at the Very Large Telescope with the SINFONI spectrograph, are used to construct maps of various emission lines that reveal the individual star forming regions ("hot spots") delineating t…
The Hubble Space Telescope/Advanced Camera for Surveys Atlas of Protoplanetary Disks in the Great Orion Nebula
Robberto, M.; Ricci, L.; Soderblom, D. R.
We present the atlas of protoplanetary disks in the Orion Nebula based on the Wide Field Channel of the Advanced Camera for Surveys (ACS/WFC) images obtained for the Hubble Space Telescope (HST) Treasury Program on the Orion Nebula Cluster. The observations have been carried out in five photometric filters nearly equivalent to the standard B, V, H…
A New Survey for Giant Arcs
Hennawi, Joseph F.; Strauss, Michael A.; Schneider, Donald P. +11 more
We report on the first results of an imaging survey to detect strong gravitational lensing targeting the richest clusters selected from the photometric data of the Sloan Digital Sky Survey (SDSS) with follow-up deep imaging observations from the Wisconsin-Indiana-Yale NOAO (WIYN) 3.5 m telescope and the University of Hawaii 88 inch telescope (UH88…
An Accurate Age Determination for the Small Magellanic Cloud Star Cluster NGC 121 with the Hubble Space Telescope/Advanced Camera for Surveys
Grebel, Eva K.; Gallagher, John S., III; Sabbi, Elena +8 more
As the first paper of a series devoted to study the old stellar population in clusters and fields in the Small Magellanic Cloud (SMC), we present deep observations of NGC 121 in the F555W and F814W filters, obtained with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. The resulting color-magnitude diagram reaches ~3.5 mag belo…
A New VLA-Hipparcos Distance to Betelgeuse and its Implications
Harper, Graham M.; Brown, Alexander; Guinan, Edward F.
The distance to the M supergiant Betelgeuse is poorly known, with the Hipparcos parallax having a significant uncertainty. For detailed numerical studies of M supergiant atmospheres and winds, accurate distances are a prerequisite to obtaining reliable estimates for many stellar parameters. New high spatial resolution, multiwavelength, NRAO3<…
Deep Advanced Camera for Surveys Imaging in the Globular Cluster NGC 6397: the Cluster Color-Magnitude Diagram and Luminosity Function
Anderson, Jay; Dotter, Aaron; Rich, R. Michael +9 more
We present the color-magnitude diagram (CMD) from deep Hubble Space Telescope imaging in the globular cluster NGC 6397. The Advanced Camera for Surveys (ACS) was used for 126 orbits to image a single field in two colors (F814W, F606W) 5' SE of the cluster center. The field observed overlaps that of archival WFPC2 data from 1994 and 1997 which were…
Determining Titan's Spin State from Cassini RADAR Images
Iess, Luciano; Cassini RADAR Team; Stiles, Bryan W. +12 more
For some 19 areas of Titan's surface, the Cassini RADAR instrument has obtained synthetic aperture radar (SAR) images during two different flybys. The time interval between flybys varies from several weeks to two years. We have used the apparent misregistration (by 10-30 km) of features between separate flybys to construct a refined model of Titan…
Open Clusters as Galactic Disk Tracers. I. Project Motivation, Cluster Membership, and Bulk Three-Dimensional Kinematics
Majewski, Steven R.; Frinchaboy, Peter M.
We have begun a survey of the chemical and dynamical properties of the Milky Way disk as traced by open star clusters. In this first contribution, the general goals of our survey are outlined and the strengths and limitations of using star clusters as a Galactic disk tracer sample are discussed. We also present medium-resolution (R ~ 15, 0000) spe…
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…