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New Optical and Near-Infrared Surface Brightness Fluctuation Models. II. Young and Intermediate-Age Stellar Populations
Cantiello, M.; Capaccioli, M.; Brocato, E. +1 more
We present theoretical surface brightness fluctuation (SBF) amplitudes for single-burst stellar populations of young and intermediate age (25 Myr<=t<=5 Gyr) and metallicities Z=0.0003, 0.001, 0.004, 0.008, 0.01, 0.02, and 0.04. The fluctuation magnitudes and colors as expected in the Johnson-Cousins (UBVRIJHK) photometric system are provided…
An XMM-Newton survey of M 31
Pietsch, W.; Haberl, F.; Freyberg, M.
In an analysis of XMM-Newton archival observations of the bright Local Group spiral galaxy
Sources of Oscillation Frequency Increase with Rising Solar Activity
Dziembowski, W. A.; Goode, P. R.
We analyze and interpret SOHO MDI data on oscillation frequency changes between 1996 and 2004, focusing on differences between the activity minimum and maximum of solar cycle 23. We study only the behavior of the centroid frequencies, which reflect changes averaged over spherical surfaces. Both the f-mode and p-mode frequencies are correlated with…
Radio Observations of the Hubble Deep Field-South Region. II. The 1.4 GHz Catalog and Source Counts
Norris, Ray P.; Huynh, Minh T.; Jackson, Carole A. +1 more
This paper is part of a series describing the results from the Australia Telescope Hubble Deep Field-South (ATHDFS) survey obtained with the Australia Telescope Compact Array. This survey consists of observations at 1.4, 2.5, 5.2, and 8.7 GHz, all centered on the Hubble Deep Field-South. Here we present the first results from the extended observin…
The B-Band Luminosity Function of Red and Blue Galaxies up to z = 3.5
Dickinson, M.; Fontana, A.; Cristiani, S. +5 more
We have explored the redshift evolution of the luminosity function of red and blue galaxies up to z=3.5. This was possible by joining a deep I-band composite galaxy sample, which includes the spectroscopic K20 sample and the Hubble Deep Field samples, with the deep HAB=26 and KAB=25 samples derived from the deep NIR images of…
Astrometric orbits of SB^9 stars
Babusiaux, C.; Jorissen, A.; Pourbaix, D. +1 more
Hipparcos Intermediate Astrometric Data (IAD) have been used to derive astrometric orbital elements for spectroscopic binaries from the newly released Ninth Catalogue of Spectroscopic Binary Orbits (SB^9). This endeavour is justified by the fact that (i) the astrometric orbital motion is often difficult to detect without the prior knowl…
Discovery of a Planetary-Mass Brown Dwarf with a Circumstellar Disk
Luhman, K. L.; Fazio, G. G.; Megeath, S. T. +4 more
Using the Hubble Space Telescope, the 4 m Blanco Telescope at the Cerro Tololo Inter-American Observatory, and the Spitzer Space Telescope, we have performed deep imaging from 0.8 to 8 µm of the southern subcluster in the Chamaeleon I star-forming region. In these data, we have discovered an object, Cha 110913-773444, whose colors and magnit…
A Systematic Search for Gravitationally Lensed Arcs in the Hubble Space Telescope WFPC2 Archive
Smith, Graham P.; Treu, Tommaso; Ellis, Richard S. +1 more
We present the results of a systematic search for gravitationally lensed arcs in clusters of galaxies located in the Hubble Space Telescope Wide Field and Planetary Camera 2 data archive. By carefully examining the images of 128 clusters we have located 12 candidate radial arcs and 104 tangential arcs, each of whose length-to-width ratio exceeds 7…
Spitzer IRS spectroscopy of 3CR radio galaxies and quasars: testing the unified schemes
Siebenmorgen, R.; Schulz, B.; Haas, M. +2 more
With the Spitzer Space Telescope Infrared Spectrograph (IRS) we have observed seven powerful FR 2 radio galaxies and seven quasars. Both samples, the galaxies and the quasars, are comparable in isotropic 178 MHz luminosity (10^26.5 W/Hz ⪉ P_178 MHz ⪉10^29.5 W/Hz) and in redshift range (0.05 ⪉ z ⪉ 1.5). We find for both samples similar distribution…
Simultaneous Ultraviolet and X-Ray Observations of Seyfert Galaxy NGC 4151. I. Physical Conditions in the X-Ray Absorbers
Gull, T. R.; Kriss, G. A.; Turner, T. J. +9 more
We present a detailed analysis of the intrinsic X-ray absorption in the Seyfert 1 galaxy NGC 4151 using Chandra High Energy Transmission Grating Spectrometer data obtained in 2002 May as part of a program that included simultaneous ultraviolet (UV) spectra using the Hubble Space Telescope Space Telescope Imaging Spectrograph and the Far Ultraviole…