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Multiwavelength Observations of the Low-Metallicity Blue Compact Dwarf Galaxy SBS 0335-052
Neugebauer, Gerry; Dale, Daniel A.; Soifer, B. T. +3 more
New infrared and millimeter observations from Keck, Palomar, ISO, and OVRO and archival data from the NRAO6 VLA and IRAS are presented for the low-metallicity blue compact dwarf galaxy SBS 0335-052. Mid-infrared imaging shows this young star-forming system is compact (0.31" 80 pc) at 12.5 µm. The large Brγ equivalent width (235 Å) measured f…
A Search for OH Megamasers at Z>0.1. II. Further Results
Giovanelli, Riccardo; Darling, Jeremy
We present current results of an ongoing survey for OH megamasers in luminous infrared galaxies at the Arecibo Observatory.1 The survey is now two-thirds complete, and has resulted in the discovery of 35 new OH megamasers at z>0.1, 24 of which are presented in this paper. We discuss the properties of each source in detail, including an exhausti…
A Search for H I in E+A Galaxies
Zabludoff, Ann I.; Zaritsky, Dennis; Mihos, J. Christopher +2 more
We present the results of H I line and radio continuum observations of five nearby E+A galaxies. These galaxies have spectra that are dominated by a young stellar component but lack the emission lines characteristic of significant ongoing star formation. They are selected from a unique sample of 21 E+A's identified by Zabludoff et al. in their spe…
Seeing Galaxies through Thick and Thin. IV. The Superposed Spiral Galaxies of NGC 3314
White, Raymond E., III; Keel, William C.
The superposed pair of spiral galaxies making up NGC 3314 offers a unique opportunity to trace the dust properties in a spiral galaxy. We analyze multicolor Hubble Space Telescope imaging, supported by ground-based near-IR imaging and fiber-array spectroscopy, to measure dust extinction in the foreground Sc galaxy NGC 3314A, which is backlit by th…
Positions for the Outer Planets and Many of Their Satellites. V. FASTT Observations Taken in 2000-2001
Stone, Ronald C.
As part of an ongoing observing program with the Flagstaff Astrometric Scanning Transit Telescope (FASTT), this paper presents 1084 new equatorial positions taken in 2000-2001 for the outer planets Uranus, Neptune, and Pluto, as well as for 17 satellites of Jupiter-Neptune. All the positions were determined using differential reductions with refer…
Statistical Properties of Circumnuclear H II Regions in Nearby Galaxies
Alonso-Herrero, Almudena; Knapen, Johan H.
We analyze the statistical properties of the circumnuclear H II regions of a sample of 52 nearby galaxies (v<1000 km s-1) from archival HST/NICMOS H-band and Paα (1.87 µm) observations at unprecedented spatial resolutions of between 1 and 30 pc. We catalog H II regions from the continuum-subtracted Paα images and find H II regi…
The Red Stellar Population in NGC 1569
Leitherer, Claus; Greggio, L.; Tosi, M. +6 more
We present HST NICMOS photometry of the resolved stellar population in the dwarf irregular galaxy NGC 1569. The color-magnitude diagram (CMD) in the F110W and F160W photometric bands contains ~2400 stars with a formal photometric error <~0.1 mag down to mF110W~23.5 and mF160W~22.5. The fiducial photometry has a completenes…
Precise Masses for Wolf 1062 AB from Hubble Space Telescope Interferometric Astrometry and MCDonald Observatory Radial Velocities
McArthur, B. E.; Benedict, G. F.; Franz, O. G. +17 more
We present an analysis of astrometric data from Fine Guidance Sensor 3 (FGS 3), a white-light interferometer on HST, and of radial velocity data from two ground-based campaigns. We model the astrometric and radial velocity measurements simultaneously to obtain parallax, proper motion, and component masses for Wolf 1062 (Gl 748; M3.5 V). To derive …
NICMOS Coronagraphic Observations of 55 Cancri
Schneider, G.; Hines, D. C.; Becklin, E. E. +3 more
We present new near-infrared (1.1 µm) observations of the circumstellar environment of the planet-bearing star 55 Cancri. With these Hubble Space Telescope (HST) images we are unable to confirm the observation of bright scattered radiation at longer NIR wavelengths previously reported by Trilling and coworkers. NICMOS coronagraphic images wi…
Multiplicity of X-Ray-selected T Tauri Stars in Chamaeleon
Köhler, Rainer
We report on a multiplicity survey of a sample of X-ray-selected young stars in the Chamaeleon association. We used speckle interferometry and direct imaging to find companions in the separation range 0.13"-6". After correction for chance alignment with background stars, we find a multiplicity (number of binaries or multiples divided by number of …