Search Publications
Titan trace gaseous composition from CIRS at the end of the Cassini-Huygens prime mission
Teanby, N. A.; Flasar, F. M.; Lavvas, P. +10 more
This paper reports on the results from an extensive study of all nadir-looking spectra acquired by Cassini/CIRS during the 44 flybys performed in the course of the nominal mission (2004-2008). With respect to the previous study (Coustenis, A., and 24 colleagues [2007]. Icarus 189, 35-62, on flybys TB-T10) we present here a significantly richer dat…
Detection of Hydrated Silicates in Crustal Outcrops in the Northern Plains of Mars
Bibring, J. -P.; Poulet, F.; Carter, J. +1 more
The composition of the ancient martian crust is a key ingredient in deciphering the environment and evolution of early Mars. We present an analysis of the composition of large craters in the martian northern plains based on data from spaceborne imaging spectrometers. Nine of the craters have excavated assemblages of phyllosilicates from ancient, N…
Very Large Telescope Kinematics for Omega Centauri: Further Support for a Central Black Hole
Lützgendorf, Nora; Gebhardt, Karl; Kissler-Patig, Markus +4 more
The Galactic globular cluster ω Centauri is a prime candidate for hosting an intermediate-mass black hole. Recent measurements lead to contradictory conclusions on this issue. We use VLT-FLAMES to obtain new integrated spectra for the central region of ω Centauri. We combine these data with existing measurements of the radial velocity dispersion p…
A Runaway Black Hole in COSMOS: Gravitational Wave or Slingshot Recoil?
Finoguenov, A.; Aussel, H.; Sanders, D. B. +38 more
We present a detailed study of a peculiar source detected in the COSMOS survey at z = 0.359. Source CXOC J100043.1+020637, also known as CID-42, has two compact optical sources embedded in the same galaxy. The distance between the two, measured in the HST/ACS image, is 0.495" ± 0.005" that, at the redshift of the source, corresponds to a projected…
The Great Observatories Origins Deep Survey. VLT/ISAAC near-infrared imaging of the GOODS-South field
Cesarsky, C.; Dickinson, M.; Rosati, P. +5 more
Aims: We present the final public data release of the VLT/ISAAC near-infrared imaging survey in the GOODS-South field. The survey covers an area of 172.5, 159.6 and 173.1 arcmin{}^2 in the J, H, and K_s bands, respectively. For point sources total limiting magnitudes of J=25.0, H=24.5, and K_s=24.4 (5σ, AB) are reached within 75% of the surve…
The inner halo of M 87: a first direct view of the red-giant population
Blakeslee, J. P.; Flynn, C.; Harris, W. E. +1 more
An unusually deep (V, I) imaging dataset for the Virgo supergiant M 87 with the Hubble Space Telescope ACS successfully resolves its brightest red-giant stars, reaching MI(lim) = -2.5. After assessing the photometric completeness and biasses, we use this material to estimate the metallicity distribution for the inner halo of M 87, findi…
NGC 839: Shocks in an M82-like Superwind
Rupke, D. S. N.; Kewley, L. J.; Dopita, M. A. +1 more
We present observations of NGC 839 made with the Wide Field Spectrograph on the ANU 2.3 m telescope. Our data cover a region 25'' × 60'' at a spatial resolution of ~1farcs5. The long axis of the field is aligned with the superwind we have discovered in this starburst galaxy. The data cover the range of 3700-7000 Å, with a spectral resolution R ~70…
Suzaku Observation of A1689: Anisotropic Temperature and Entropy Distributions Associated with the Large-scale Structure
Fukazawa, Yasushi; Nakazawa, Kazuhiro; Ohashi, Takaya +7 more
We present results of new, deep Suzaku X-ray observations (160 ks) of the intracluster medium (ICM) in A1689 out to its virial radius, combined with complementary data sets of the projected galaxy distribution obtained from the SDSS catalog and the projected mass distribution from our recent comprehensive weak and strong lensing analysis of Subaru…
Fading Hard X-ray Emission from the Galactic Center Molecular Cloud Sgr B2
Ponti, G.; Decourchelle, A.; Morris, M. R. +6 more
The center of our Galaxy harbors a four million solar mass black hole that is unusually quiet: its present X-ray luminosity is more than 10 orders of magnitude less than its Eddington luminosity. The observation of iron fluorescence and hard X-ray emission from some of the massive molecular clouds surrounding the Galactic center has been interpret…
Exoplanet Albedo Spectra and Colors as a Function of Planet Phase, Separation, and Metallicity
Fortney, Jonathan J.; Marley, Mark S.; Cahoy, Kerri L.
First generation space-based optical coronagraphic telescopes will obtain images of cool gas- and ice-giant exoplanets around nearby stars. Exoplanets lying at planet-star separations larger than about 1 AU—where an exoplanet can be resolved from its parent star—have spectra that are dominated by reflected light to beyond 1 µm and punctuated…