Search Publications
Hubble Space Telescope NICMOS Imaging of the Core of M87
Rieke, Marcia J.; Corbin, Michael R.; O'Neil, Earl
We present broadband 1.1, 1.6, and 2.2 µm images and a 2.37 µm narrowband image of the inner 19" of the nearby radio galaxy M87, obtained with the Near Infrared Camera and Multi-Object Spectrometer of the Hubble Space Telescope (HST). The isophotes of the broadband images are almost perfectly circular to within approximately 0.5" (~50 …
The Nature of [Ar III]-Bright Knots in the Crab Nebula
Fesen, Robert A.; Schaller, Emily L.
The kinematic and morphological properties of a string of [Ar III]-bright knots in the Crab Nebula are examined using 1994-1999 Hubble Space Telescope (HST) Wide Field Planetary Camera 2 images of the remnant. We find that five southern [Ar III]-bright knots exhibit ordinary radial motions away from the nebula's center of expansion with magnitudes…
A Polarimetric Survey for Dust in 47 Tucanae
Forte, Juan C.; Vega, E. Irene; Cellone, Sergio A. +3 more
We present linear polarization measurements in the V band for 77 stars in the field of the globular cluster 47 Tucanae (NGC 104) and for 14 regions free of bright stars, located along an elliptical isophotal contour of the cluster, as well as UBVRI measurements for the cluster nucleus. The observations show variable foreground polarization that, o…
Infrared Space Observatory Polarimetric Imaging of the Egg Nebula (RAFGL 2688)
Kastner, Joel H.; Siebenmorgen, Ralf; Li, Jingqiang +1 more
We present polarimetric imaging of the protoplanetary nebula RAFGL 2688 obtained at 4.5 µm with the Infrared Space Observatory (ISO). We have deconvolved the images to remove the signature of the point spread function of the ISO telescope, to the extent possible. The deconvolved 4.5 µm image and polarimetric map reveal a bright point s…
Star Formation in the radio galaxy NGC 4410A
Donahue, Megan; Stocke, John T.; Smith, Beverly J.
The NGC 4410 group of galaxies provides us with a rare opportunity to study a nearby (97 h-175 Mpc) example of a radio galaxy (NGC 4410A) embedded in an extended X-ray source, with evidence for star formation that can be readily spatially distinguished from regions dominated by the active galactic nucleus and shocks. We prese…
Galaxy Morphology in the Rich Cluster Abell 2390
Saintonge, A.; Hutchings, J. B.; Schade, D. +1 more
We have analyzed images of the field of Abell 2390 obtained with the Canada-France-Hawaii Telescope and the Hubble Space Telescope. The analysis fits models to bulge and disk components of several hundred galaxies, with about equal samples from the cluster and field. We also have assessed and graded asymmetries in the images. The cluster galaxies …