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111 papers · 1 filter
Maximum-Likelihood Comparisons of Tully-Fisher and Redshift Data: Constraints on Omega and Biasing
Jeffrey A. Willick, Michael A. Strauss, Avishai Dekel +1
We compare Tully-Fisher (TF) data for 838 galaxies within cz=3000 km/sec from the Mark III catalog to the peculiar velocity and density fields predicted from the 1.2 Jy IRAS redshi…
EROS differential studies of Cepheids in the Magellanic Clouds : Stellar pulsation, stellar evolution and distance scale
J. P. Beaulieu, D. D. Sasselov
We present a differential study of 500 Magellanic Cepheids with 3 million measurements obtained as a by-product of the EROS microlensing survey. The data-set is unbiased and provid…
Long-range interactions of lithium atoms
Zong-Chao Yan, A. Dalgarno, J. F. Babb
The long-range interactions of two atoms, of an atom and a dielectric wall, of an atom and a perfectly conducting wall, and of an atom between two perfectly conducting walls are ca…
Supernova Remnants Associated with Molecular Clouds in the Large Magellanic Cloud
Kenneth R. Banas, John P. Hughes, L. Bronfman +1
We used the Swedish-ESO Submillimeter Telescope (SEST) to search for CO emission associated with three supernova remnants (SNRs) in the Large Magellanic Cloud: N49, N132D, and N23.…
Optical Properties of Cooling Flow Central Cluster Ellipticals
Brian R. McNamara
Central cluster galaxies in cooling flows show the signatures of gaseous accretion and ongoing star formation at rates ranging between 1-100 solar masses per year. Their blue morph…
The Distance of the Soft Gamma Repeater SGR 1806-20
S. Corbel, P. Wallyn, T. M. Dame +4
We present CO(J=1-0) observations in the direction of the Soft Gamma Repeater SGR 1806-20 with the SEST telescope. We detected several molecular clouds, and we discuss in this pape…
An Einstein X-ray Survey of Optically-Selected Galaxies: I. Data
David Burstein, Christine Jones, William Forman +2
We present the results of a complete Einstein Imaging Proportional Counter (IPC) X-ray survey of optically-selected galaxies from Shapley-Ames Catalog, Uppsala General Catalog and…
HST Observations and Models of The Gravitational Lens System MG 0414+0534
Emilio E. Falco, Joseph Lehar, Irwin I. Shapiro
Quadruple gravitational lens systems offer the possibility of measuring time delays for image pairs, microlensing effects, and extinction in distant galaxies. Observations of these…
The Identification of EGRET Sources with Flat-Spectrum Radio Sources
J. R. Mattox, J. Schachter, L. Molnar +2
We present a method to assess the reliability of the identification of EGRET sources with extragalactic radio sources. We verify that EGRET is detecting the blazar class of AGN. Ho…
Gas-Rich Dwarf Galaxies from the PSS-II --- II. Optical Properties
R. A. Pildis, J. M. Schombert, J. Eder
We describe the optical properties of a sample of 101 gas-rich field dwarf galaxies found on PSS-II (Second Palomar Sky Survey) plates, most newly discovered as part of a survey to…
Gas Rich Dwarfs from the PSS-II I. Catalog and Characteristics
James Schombert, Rachel Pildis, Jo Ann Eder
This project is a visual search for field dwarf galaxies using Second Palomar Sky Survey photographic plates. A morphologically selected sample of 310 objects yielded 145 detection…
ROSAT X-ray Observations of the Cooling Flow Cluster A2597
Craig L. Sarazin, Brian R. McNamara
The cluster A2597 was observed in X-rays with the ROSAT PSPC and HRI detectors. The X-ray isophotes are oriented similarly to the optical isophotes of the central cD galaxy and to…
Evidence for an X-ray Emitting Galactic Bulge: Shadows Cast by Distant Molecular Gas
Sangwook Park, John P. Finley, Steven L. Snowden +1
A mosaic of 7 ROSAT PSPC pointed observations in the direction of (l,b ~ 10,0 deg) reveals deep X-ray shadows in the 0.5-2.0 keV band cast by dense molecular gas. The comparison be…
The Flat Spectrum Radio Luminosity Function, Gravitational Lensing, Galaxy Ellipticities and Cosmology
C. S. Kochanek
The number of lenses found in the JVAS survey of flat-spectrum radio sources for gravitational lenses is consistent with statistical models of optical surveys for lensed quasars. T…
SBS 0909+532: A New Double Gravitational Lens or Binary Quasar?
C. S. Kochanek, E. E. Falco, R. Schild +3
The z=1.377, B=17.0 mag quasar SBS 0909+532 A, B is a double with two images separated by 1.107 +/- 0.006 arcsec. Because the faint image has an emission line at the same wavelengt…
Gravitational Lensing Limits on Early-Type Galaxies
C. S. Kochanek, C. R. Keeton
Gravitational lenses are a unique new constraint on the structure of galaxies. We review the evidence that most lenses are early-type galaxies, the optical properties of the lens g…
The Las Campanas Redshift Survey Galaxy-Galaxy Autocorrelation Function
D. L. Tucker, A. Oemler, R. P. Kirshner +7
Presented are measurements of the observed redshift-space galaxy-galaxy autocorrelation function, xi(s), for the Las Campanas Redshift Survey (LCRS). For separations 2.0/h Mpc < s…
Cosmology in a String-Dominated Universe
David Spergel, Ue-Li Pen
The string-dominated universe locally resembles an open universe, and fits dynamical measures of power spectra, cluster abundances, redshift distortions, lensing constraints, lumin…
Science Driven arguments for a 10 sq.meter, 1 arcsecond X-ray Telescope
Martin Elvis, Giuseppina Fabbiano
X-ray astronomy needs to set bold, science driven goals for the next decade. Only with defined science goals can we know what to work on, and a funding agency appreciate the need f…
The Weak Blue Bump of H2106-099 and AGN De-Reddening
B. Grossan, R. A. Remillard, H. V. Bradt +3
We present multi-frequency spectra of the Seyfert 1 galaxy H2106-099, from radio to hard X-rays, spanning over a decade of observations. The hard X-ray (2-20 keV) spectrum measured…
Extremely Rapid Variations of Water Maser Emission from the Circinus Galaxy
L. J. Greenhill, S. P. Ellingsen, R. P. Norris +4
The water maser lines in the nucleus of the Circinus galaxy vary on time scales as short as a few minutes, at least two orders of magnitude less than for other Galactic or extragal…
Radii and Distances of Cepheids, I., Method and Measurement Errors
Martin Krockenberger, Dimitar D. Sasselov, Robert W. Noyes
We develop a formulation of the Baade-Wesselink method which uses the Fourier coefficients of the observables. We derive an explicit, analytic expression to determine the mean radi…
The Quadruple Gravitational Lens PG1115+080: Time Delays and Models
P. L. Schechter, C. D. Bailyn, R. Barr +24
Optical photometry is presented for the quadruple gravitational lens PG1115+080. A preliminary reduction of data taken from November 1995 to June 1996 gives component ``C'' leading…
Retarded long-range potentials for the alkali-metal atoms and a perfectly conducting wall
M. Marinescu, A. Dalgarno, J. F. Babb
The retarded long-range potentials for hydrogen and alkali-metal atoms in their ground states and a perfectly conducting wall are calculated. The potentials are given over a wide r…