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W. Sparks | Semantic Scholar

The Supermassive Black Hole of M87 and the Kinematics of Its Associated Gaseous Disk

We have obtained long-slit observations of the circumnuclear region of M87 at three different locations, with a spatial sampling of 0.″028 using the Faint Object Camera f/48 spectrograph on board…

Strong-Lensing Analysis of A1689 from Deep Advanced Camera Images

We analyze deep multicolor Advanced Camera images of the largest known gravitational lens, A1689. Radial and tangential arcs delineate the critical curves in unprecedented detail, and many small…

HUBBLE SPACE TELESCOPE Observations of Superluminal Motion in the M87 Jet

We present observations of the M87 jet made with the Faint Object Camera on board the Hubble Space Telescope at five epochs between 1994 and 1998. These observations reveal 10 superluminal features…

Hubble Space Telescope Advanced Camera for Surveys Coronagraphic Imaging of the AU Microscopii Debris Disk

We present Hubble Space Telescope Advanced Camera for Surveys multicolor coronagraphic images of the recently discovered edge-on debris disk around the nearby (∼10 pc) M dwarf AU Microscopii. The…

An energetic stellar outburst accompanied by circumstellar light echoes

High-resolution imaging and polarimetry of light echoes indicate that V838 Mon represents a hitherto unknown type of stellar outburst, for which the authors have no completely satisfactory physical explanation.

A survey of the ISM in early-type galaxies. I. The ionized gas

We present results of a CCD optical imaging survey of the ionized gas in 73 luminous elliptical and lenticular galaxies, selected from the RC3 catalog to represent a broad variety of X-ray, radio,…

Hubble Space Telescope ACS Multiband Coronagraphic Imaging of the Debris Disk around β Pictoris

We present F435W (B), F606W (broad V), and F814W (broad I) coronagraphic images of the debris disk around β Pictoris obtained with the Hubble Space Telescope's Advanced Camera for Surveys. These…

The Dust-Radio Connection in 3CR Radio Galaxies

We investigate dust in the nuclear regions of radio galaxies on the basis of 120 images of 3CR radio galaxies in the redshift range 0 < z < 0.5, taken with the WFPC-2 on the Hubble Space Telescope.…

An optical spectroscopic survey of the 3CR sample of radio galaxies with z < 0.3. I. Presentation of the data ⋆

We present a homogeneous and 92% complete dataset of optical nuclear spectra for the 113 3CR radio sources with redshifts < 0.3, obtained with the Telescopio Nazionale Galileo. For these sources we…

Hubble Space Telescope ACS Coronagraphic Imaging of the Circumstellar Disk around HD 141569A

Multicolor coronagraphic images of the circumstellar disk around HD 141569A have been obtained with the Hubble Space Telescope Advanced Camera for Surveys. The B, V, and I images show that the disk's…