Search Publications
On the Progenitor and Supernova of the SN 2002cx-like Supernova 2008ge
Foley, Ryan J.; Rest, Armin; Phillips, Mark M. +6 more
We present observations of supernova (SN) 2008ge, which is spectroscopically similar to the peculiar SN 2002cx, and its pre-explosion site indicating that its progenitor was probably a white dwarf. NGC 1527, the host galaxy of SN 2008ge, is an S0 galaxy with no evidence of star formation or massive stars. Astrometrically matching late-time imaging…
Modeling the Outflow in the Narrow-line Region of Markarian 573: Biconical Illumination of a Gaseous Disk
Kraemer, S. B.; Crenshaw, D. M.; Schmitt, H. R. +2 more
We present a study of the outflowing ionized gas in the resolved narrow-line region of the Seyfert 2 galaxy Mrk 573, and its interaction with an inner dust/gas disk, based on Hubble Space Telescope (HST) Wide Field Planetary Camera 2 and Space Telescope Imaging Spectrograph observations. From the spectroscopic and imaging information, we determine…
Cassini UVIS Stellar Occultation Observations of Saturn's Rings
Sremčević, M.; Colwell, J. E.; Esposito, L. W. +3 more
The Cassini spacecraft's Ultraviolet Imaging Spectrograph (UVIS) includes a high-speed photometer (HSP) that has observed more than 100 stellar occultations by Saturn's rings. Here, we document a standardized technique applied to the UVIS-HSP ring occultation datasets delivered to the Planetary Data System as higher level data products. These obse…
New Observations of the Very Luminous Supernova 2006gy: Evidence for Echoes
Bloom, J. S.; Smith, N.; Filippenko, A. V. +4 more
Supernova (SN) 2006gy was a hydrogen-rich core-collapse SN that remains one of the most luminous optical SNe ever observed. The total energy budget (>2 × 1051 erg radiated in the optical alone) poses many challenges for standard SN theory. We present new ground-based near-infrared (NIR) observations of SN 2006gy, as well as a single …
The Mass of HD 38529c from Hubble Space Telescope Astrometry and High-precision Radial Velocities
Nelan, Edmund P.; Harrison, Thomas E.; Bean, Jacob L. +5 more
Hubble Space Telescope Fine Guidance Sensor astrometric observations of the G4 IV star HD 38529 are combined with the results of the analysis of extensive ground-based radial velocity (RV) data to determine the mass of the outermost of two previously known companions. Our new RVs obtained with the Hobby-Eberly Telescope and velocities from the Car…
The Geometry of Mass Outflows and Fueling Flows in the Seyfert 2 Galaxy MRK 3
Kraemer, S. B.; Crenshaw, D. M.; Schmitt, H. R. +4 more
We present a study of the resolved emission-line regions and an inner dust/gas disk in the Seyfert 2 galaxy Mrk 3, based on Hubble Space Telescope observations. We show that the extended narrow-line region (ENLR), spanning ~4 kpc, is defined by the intersection of the ionizing bicone of radiation from the active galactic nucleus (AGN) and the inne…
Morphologies of Radio-, X-ray-, and Mid-infrared-selected Active Galactic Nuclei
Griffith, Roger L.; Stern, Daniel
We investigate the optical morphologies of candidate active galaxies identified at radio, X-ray, and mid-infrared wavelengths. We use the Advanced Camera for Surveys General Catalog (ACS-GC) to identify 372, 1360, and 1238 active galactic nucleus (AGN) host galaxies from Very Large Array, XMM-Newton, and Spitzer Space Telescope observations of the…
The Morphology of IRC+10420's Circumstellar Ejecta
Humphreys, Roberta M.; Davidson, Kris; Jones, Terry J. +1 more
Images of the circumstellar ejecta associated with the post-red supergiant IRC+10420 show a complex ejecta with visual evidence for episodic mass loss. In this paper, we describe the transverse motions of numerous knots, arcs, and condensations in the inner ejecta measured from second epoch Hubble Space Telescope/WFPC2 images. When combined with t…
The Buried Starburst in the Interacting Galaxy II Zw 096 as Revealed by the Spitzer Space Telescope
Sturm, E.; Veilleux, S.; Sanders, D. B. +31 more
An analysis of data from the Spitzer Space Telescope, Hubble Space Telescope, Chandra X-ray Observatory, and AKARI Infrared Astronomy Satellite is presented for the z = 0.036 merging galaxy system II Zw 096 (CGCG 448-020). Because II Zw 096 has an infrared luminosity of log(L IR/L sun) = 11.94, it is classified as a Luminous …
Space Velocities of Southern Globular Clusters. VI. Nine Clusters in the Inner Milky Way
Casetti-Dinescu, Dana I.; Girard, Terrence M.; Korchagin, Vladimir I. +2 more
We have measured the absolute proper motions of nine low-latitude, inner Galaxy globular clusters, namely, NGC 6273 (M 19), NGC 6284, NGC 6287, NGC 6293, NGC 6333 (M 9), NGC 6342, NGC 6356, NGC 6388, and NGC 6441. These are the first determinations ever made for these clusters. The proper motions are on the International Celestial Reference System…