Search Publications
The Mass Structure of the Galaxy Cluster Cl0024+1654 from a Full Lensing Analysis of Joint Subaru and ACS/NIC3 Observations
Broadhurst, Tom; Zitrin, Adi; Umetsu, Keiichi +4 more
We derive an accurate mass distribution of the rich galaxy cluster Cl0024+1654 (z = 0.395) based on deep Subaru BR c z' imaging and our recent comprehensive strong-lensing analysis of Hubble Space Telescope/Advanced Camera for Surveys/NIC3 observations. We obtain the weak-lensing distortion and magnification of undiluted samples of red …
E-Type Asteroid (2867) Steins as Imaged by OSIRIS on Board Rosetta
Jorda, L.; Bertaux, J. -L.; Lamy, P. +44 more
The European Space Agency’s Rosetta mission encountered the main-belt asteroid (2867) Steins while on its way to rendezvous with comet 67P/Churyumov-Gerasimenko. Images taken with the OSIRIS (optical, spectroscopic, and infrared remote imaging system) cameras on board Rosetta show that Steins is an oblate body with an effective spherica…
Ultraviolet dust aerosol properties as observed by MARCI
Goguen, Jay D.; Wolff, Michael J.; Malin, Michael C. +2 more
Observations by the Mars Color Imager (MARCI) on board the Mars Reconnaissance Orbiter (MRO) in two ultraviolet (UV, Bands 6 and 7; 258 nm, and 320 nm, respectively) and one visible (Band 1, 436 nm) channels of the 2007 planet encircling dust storm are combined with those made by the two Mars Exploration Rovers (MERs) to better characterize the si…
Internal Dynamics and Membership of the NGC 3603 Young Cluster from Microarcsecond Astrometry
Henning, Thomas; Da Rio, Nicola; Gennaro, Mario +5 more
We have analyzed two epochs of HST/WFPC2 observations of the young Galactic starburst cluster in NGC 3603 with the aim to study its internal dynamics and stellar population. Relative proper motions measured over 10.15 yrs of more than 800 stars enable us to distinguish cluster members from field stars. The best-fitting isochrone yields A V
The X-ray Energy Dependence of the Relation Between Optical and X-ray Emission in Quasars
Elvis, M.; Risaliti, G.; Young, M.
We develop a new approach to the well-studied anti-correlation between the optical-to-X-ray spectral index, αox, and the monochromatic optical luminosity, l opt. By cross-correlating the Sloan Digital Sky Survey DR5 quasar catalog with the XMM-Newton archive, we create a sample of 327 quasars with X-ray signal-to-noise ratio …
Far-infrared properties of submillimeter and optically faint radio galaxies
Berta, S.; Magnelli, B.; Nordon, R. +34 more
We use deep observations obtained with the Photodetector Array Camera and Spectrometer (PACS) onboard the Herschel Space Observatory to study the far-infrared (FIR) properties of submillimeter and optically faint radio galaxies (SMGs and OFRGs). From literature we compiled a sample of 35 securely identified SMGs and nine OFRGs located in the GOODS…
The Distance to NGC 1316 (Fornax A) from Observations of Four Type Ia Supernovae
Morrell, Nidia; Madore, Barry F.; Freedman, Wendy L. +15 more
The giant elliptical galaxy NGC 1316 (Fornax A) is a well-studied member of the Fornax Cluster and a prolific producer of Type Ia supernovae (SNe Ia), having hosted four observed events since 1980. Here, we present detailed optical- and near-infrared light curves of the spectroscopically normal SN 2006dd. These data are used, along with previously…
Properties of Saturn kilometric radiation measured within its source region
Schippers, P.; André, N.; Gurnett, D. A. +9 more
On 17 October 2008, the Cassini spacecraft crossed the southern sources of Saturn kilometric radiation (SKR), while flying along high-latitude nightside magnetic field lines. In situ measurements allowed us to characterize for the first time the source region of an extra-terrestrial auroral radio emission. Using radio, magnetic field and particle …
Reconstructing the solar integrated radial velocity using MDI/SOHO
Meunier, N.; Lagrange, A. -M.; Desort, M.
Context. Searches for exoplanets with radial velocity techniques are increasingly sensitive to stellar activity. It is therefore crucial to characterize how this activity influences radial velocity measurements in their study of the detectability of planets in these conditions.
Aims: In a previous work we simulated the impact of spots and pla…
StarCAT: A Catalog of Space Telescope Imaging Spectrograph Ultraviolet Echelle Spectra of Stars
Ayres, Thomas R.
StarCAT is a catalog of high resolution ultraviolet spectra of objects classified as "stars," recorded by Space Telescope Imaging Spectrograph (STIS) during its initial seven years of operations (1997-2004). StarCAT is based on 3184 echelle observations of 545 distinct targets, with a total exposure duration of 5.2 Ms. For many of the objects, bro…