Search Publications
The Size Distribution of Trans-Neptunian Bodies
Brown, M. E.; Bernstein, G. M.; Trilling, D. E. +3 more
We search 0.02 deg2 of the invariable plane for trans-Neptunian objects (TNOs) 25 AU or more distant using the Advanced Camera for Surveys (ACS) aboard the Hubble Space Telescope. With 22 ks per pointing, the search is more than 50% complete for m606W<=29.2. Three new objects are discovered, the faintest with mean magnitud…
The Mass Accretion Rates of Intermediate-Mass T Tauri Stars
Gordon, Karl D.; Hartmann, Lee; Calvet, Nuria +4 more
We present Hubble Space Telescope ultraviolet spectra and supporting ground-based data for a sample of nine intermediate-mass T Tauri stars (IMTTSs; 1.5-4 Msolar). The targets belong to three star-forming regions: T Tau, SU Aur, and RY Tau in the Taurus clouds; EZ Ori, P2441, and V1044 Ori in the Ori OB1c association surrounding the Ori…
Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program
Brinkmann, J.; Kirkpatrick, J. Davy; Fan, X. +12 more
We present preliminary trigonometric parallaxes and proper motions for 22 L dwarfs and 18 T dwarfs measured using the ASTROCAM infrared imager on the US Naval Observatory (USNO) 1.55 m Strand Astrometric Reflector. The results presented here are based on observations obtained between 2000 September and 2002 November; about half of the objects have…
The Size Evolution of High-Redshift Galaxies
Dickinson, Mark; Ferguson, Henry C.; Giavalisco, Mauro +14 more
Hubble Space Telescope images of high-redshift galaxies selected via color and photometric redshifts are used to examine the size and axial ratio distribution of galaxies as a function of redshift at look-back times t>8 Gyr. These parameters are measured at rest-frame UV wavelengths (1200 Å < λ < 2000 Å) on images with a rest-frame resolu…
Comparing the temperatures of galaxy clusters from hydrodynamical N-body simulations to Chandra and XMM-Newton observations
Rasia, E.; Mazzotta, P.; Moscardini, L. +1 more
Theoretical studies of the physical processes guiding the formation and evolution of galaxies and galaxy clusters in the X-ray region are mainly based on the results of numerical hydrodynamical N-body simulations, which in turn are often directly compared with X-ray observations. Although trivial in principle, these comparisons are not always simp…
The Cassini Visual And Infrared Mapping Spectrometer (Vims) Investigation
Sotin, C.; Brown, R. H.; Baines, K. H. +19 more
The Cassini visual and infrared mapping spectrometer (VIMS) investigation is a multidisciplinary study of the Saturnian system. Visual and near-infrared imaging spectroscopy and high-speed spectrophotometry are the observational techniques. The scope of the investigation includes the rings, the surfaces of the icy satellites and Titan, and the atm…
Recent and episodic volcanic and glacial activity on Mars revealed by the High Resolution Stereo Camera
Jaumann, R.; Head, J. W.; Neukum, G. +9 more
The large-area coverage at a resolution of 10-20metres per pixel in colour and three dimensions with the High Resolution Stereo Camera Experiment on the European Space Agency Mars Express Mission has made it possible to study the time-stratigraphic relationships of volcanic and glacial structures in unprecedented detail and give insight into the g…
The 2-8 keV cosmic X-ray background spectrum as observed with XMM-Newton
Molendi, S.; De Luca, A.
We have measured the spectrum of the Cosmic X-ray Background (CXB) in the 2-8 keV range with the high throughput EPIC/MOS instrument onboard XMM-Newton. A large sample of high galactic latitude observations was used, covering a total solid angle of 5.5 square degrees. Our study is based on a very careful characterization and subtraction of the ins…
Combined long and short time-scale X-ray variability of NGC 4051 with RXTE and XMM-Newton
Papadakis, I. E.; Page, M. J.; Uttley, P. +2 more
We present a comprehensive examination of the X-ray variability of the narrow-line Seyfert 1 (NLS1) galaxy NGC 4051, one of the most variable active galactic nuclei (AGN) in the sky. We combine over 6.5 years of frequent monitoring observations by RXTE with a >100-ks continuous observation by XMM-Newton and so present an overall 2-10 keV power …
The jets and supercritical accretion disk in SS433
Fabrika, S.
The review describes observations and investigations of the unique object SS433 obtained after 23 years of studying this massive binary system. The main difference between SS433 and other known X-ray binaries is the action of a constant supercritical regime for the accretion of gas onto the relativistic star (most likely a black hole), which has l…