Search Publications
Interferometric Astrometry of the Low-Mass Binary GL 791.2 (= HU Del) UsingHubble Space Telescope Fine Guidance Sensor 3: Parallax and Component Masses
Henry, Todd J.; Wasserman, Lawrence H.; Benedict, G. Fritz +2 more
With fourteen epochs of fringe-tracking data spanning 1.7 yr from Fine Guidance Sensor 3 we have obtained a parallax (πabs=113.1+/-0.3 mas) and perturbation orbit for Gl 791.2A. Contemporaneous fringe-scanning observations yield only three clear detections of the secondary on both interferometer axes. They provide a mean component magni…
A Near-Infrared Stellar Census of Blue Compact Dwarf Galaxies: NICMOS Detection of Red Giant Stars in the Wolf-Rayet Galaxy Markarian 178
Greggio, Laura; Hopp, Ulrich; Schulte-Ladbeck, Regina E. +1 more
We observed the blue compact dwarf/Wolf-Rayet galaxy Mrk 178 with the NICMOS camera aboard Hubble Space Telescope. The galaxy is well resolved into individual stars in the near-IR photometry in J and H yields color-magnitude diagrams containing 791 individual point sources. We discuss the stellar content, drawing particular attention to the interm…
PMN J1838-3427: A New Gravitationally Lensed Quasar
Kochanek, C. S.; Rix, H. -W.; Dressler, Alan +11 more
We report the discovery of a new double-image quasar that was found during a search for gravitational lenses in the southern sky. Radio source PMN J1838-3427 is composed of two flat-spectrum components with separation 1.0", flux density ratio 14:1, and matching spectral indices in VLA and VLBA images. Ground-based BRI images show the optical count…
The Nature of the Halo Population of NGC 5128 Resolved with NICMOS on the Hubble Space Telescope
Charlot, Stéphane; Graham, James R.; Liu, Michael C. +1 more
We present the first infrared (IR) color-magnitude diagram (CMD) for the halo of a giant elliptical galaxy. The CMD for the stars in the halo of NGC 5128 (Centaurus A) was constructed from Hubble Space Telescope NICMOS observations of the WFPC2 CHIP-3 field of Soria et al. to a 50% completeness magnitude limit of [F160W]=23.8. This field is locate…
Radiometric Validation of the Midcourse Space Experiment's (MSX) Point Source Catalogs and the MSX Properties of Normal Stars
Cohen, Martin; Hammersley, Peter L.; Egan, Michael P.
We describe our methods to validate the absolute calibration of the infrared (IR) radiometry of the Midcourse Space Experiment (MSX) Point Source Catalog, version 1.2 (PSC1.2). These are based upon stars drawn from our current all-sky network of absolute calibrators and upon other stars that also support the calibration of ESA's Infrared Space Obs…
Hubble Space Telescope Observations of the Wolf-Rayet Nebula NGC 6888
Hester, J. Jeff; Scowen, Paul A.; Moore, Brian D.
We present Hubble Space Telescope Wide Field Planetary Camera 2 images of a portion of the bright northeast rim of NGC 6888, the nebular shell physically associated with the Wolf-Rayet star HD 192163. The exposures are taken in the light of Hα λ6563, [O III] λ5007, and [S II] λλ6717, 6731. The images are used to constrain models of the ionization …
Hubble Space Telescope Observations of the Interacting Galaxies NGC 2207 and IC 2163
Bond, Howard E.; Brinks, Elias; Struck, Curtis +11 more
Hubble Space Telescope (HST) images of the galaxies NGC 2207 and IC 2163 show star formation and dust structures in a system that has experienced a recent grazing encounter. Tidal forces from NGC 2207 compressed and elongated the disk of IC 2163, forming an oval ridge of star formation along a caustic where the perturbed gas rebounded after its in…
On the Nature of Andromeda IV
Gallagher, J. S.; Wyse, Rosemary F. G.; Ferguson, Annette M. N.
Lying at a projected distance of 40' or 9 kpc from the center of M31, Andromeda IV is an enigmatic object first discovered during van den Bergh's search for dwarf spheroidal companions to M31. Since it is bluer, more compact, and has a higher surface brightness than other known dwarf spheroidals, it has been suggested that And IV is either a relat…
Extremely Red Objects from the Hubble Space Telescope NICMOS Parallel Imaging Survey
Teplitz, Harry I.; McCarthy, Patrick J.; Dressler, Alan +5 more
We present a catalog of extremely red objects (EROs) discovered using the Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer (NICMOS) parallel imaging database and ground-based optical follow-up observations. Within an area of 16 arcmin2, we detect 15 objects with R-F160W>5 and F160W<21.5. We have also obtai…
Hubble Space Telescope NICMOS Color Transformations and Photometric Calibrations
Rich, R. Michael; Jablonka, Pascale; Frogel, Jay A. +4 more
This paper presents color transformations for Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer (NICMOS) camera 2 observations to the ground-based Carnegie image tube photometric system at Cerro Tololo Inter-American Observatory (CIT/CTIO), using observations of 19 moderately bright, red stars in Baade's window in the color…