Search Publications
An Ultraviolet Spectroscopic Atlas of Local Starbursts and Star-forming Galaxies: The Legacy of FOS and GHRS
Heckman, Timothy M.; Calzetti, Daniela; Leitherer, Claus +1 more
We present 46 rest-frame ultraviolet (UV) spectra of 28 local starburst and star-forming galaxies which were observed with the Faint Object Spectrograph (FOS) and the Goddard High Resolution Spectrograph (GHRS) of the Hubble Space Telescope (HST) at a spectral resolution of a few 100 km s-1. We compare the HST spectra with lower resolut…
Plasma, plumes and rings: Saturn system dynamics as recorded in global color patterns on its midsize icy satellites
Johnson, Robert E.; Hamilton, Douglas P.; McKinnon, William B. +4 more
New global maps of the five inner midsize icy saturnian satellites, Mimas, Enceladus, Tethys, Dione, and Rhea, have been constructed in three colors (UV, Green and near-IR) at resolutions of 1 km/pixel. The maps reveal prominent global patterns common to several of these satellites but also three major color features unique to specific satellites …
Evidence of Water Vapor in Excess of Saturation in the Atmosphere of Mars
Forget, F.; Maltagliati, L.; Montmessin, F. +3 more
The vertical distribution of water vapor is key to the study of Mars’ hydrological cycle. To date, it has been explored mainly through global climate models because of a lack of direct measurements. However, these models assume the absence of supersaturation in the atmosphere of Mars. Here, we report observations made using the SPICAM (Spectroscop…
A coincidence of disturbed morphology and blue UV colour: minor-merger-driven star formation in early-type galaxies at z∼ 0.6
Ellis, Richard S.; Kaviraj, Sugata; Silk, Joseph +1 more
We exploit multiwavelength photometry of early-type galaxies (ETGs) in the Cosmological Evolution Survey (COSMOS) to demonstrate that the low-level star formation activity in the ETG population at intermediate redshift is likely to be driven by minor mergers. Splitting the ETGs into galaxies that show disturbed morphologies indicative of recent me…
Connection Between the Accretion Disk and Jet in the Radio Galaxy 3C 111
Rothschild, Richard E.; McHardy, Ian M.; Rivers, Elizabeth +13 more
We present the results of extensive multi-frequency monitoring of the radio galaxy 3C 111 between 2004 and 2010 at X-ray (2.4-10 keV), optical (R band), and radio (14.5, 37, and 230 GHz) wave bands, as well as multi-epoch imaging with the Very Long Baseline Array (VLBA) at 43 GHz. Over the six years of observation, significant dips in the X-ray li…
Influence of the Ambient Solar Wind Flow on the Propagation Behavior of Interplanetary Coronal Mass Ejections
Veronig, Astrid M.; Temmer, Manuela; Vršnak, Bojan +3 more
We study three coronal mass ejection (CME)/interplanetary coronal mass ejection (ICME) events (2008 June 1-6, 2009 February 13-18, and 2010 April 3-5) tracked from Sun to 1 AU in remote-sensing observations of Solar Terrestrial Relations Observatory Heliospheric Imagers and in situ plasma and magnetic field measurements. We focus on the ICME propa…
The energy source of the filaments around the giant galaxy NGC 1275
Fabian, A. C.; Ferland, G. J.; Sanders, J. S. +3 more
The brightest galaxy in the nearby Perseus cluster, NGC 1275, is surrounded by a network of filaments. These were first observed through their Hα emission but are now known to have a large molecular component with a total mass approaching 1011 M⊙ of gas. The filaments are embedded in hot intracluster gas and stretch over 80 k…
Molecular gas and star formation in early-type galaxies
Bureau, Martin; Crocker, Alison F.; Young, Lisa M. +1 more
We present new mm interferometric and optical integral-field unit (IFU) observations and construct a sample of 12 elliptical (E) and lenticular (S0) galaxies with molecular gas which have both CO and optical maps. The galaxies contain 2 × 107 to 5 × 109 M⊙ of molecular gas distributed primarily in central discs or …
Evidence for two phases of galaxy formation from radial trends in the globular cluster system of NGC 1407
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +3 more
Here we present the colours of individual globular clusters (GCs) around the massive elliptical galaxy NGC 1407 out to a projected galactocentric radius of 140 kpc or 17 galaxy effective radii (Re). Such data are a proxy for the halo metallicity. We find steep, and similar, metallicity gradients of ∼-0.4 dex dex-1 for both th…
Scaling Relations and Overabundance of Massive Clusters at z >~ 1 from Weak-lensing Studies with the Hubble Space Telescope
Gladders, M. D.; Ford, H. C.; Huang, X. +22 more
We present weak gravitational lensing analysis of 22 high-redshift (z >~ 1) clusters based on Hubble Space Telescope images. Most clusters in our sample provide significant lensing signals and are well detected in their reconstructed two-dimensional mass maps. Combining the current results and our previous weak-lensing studies of five other hig…