Search Publications
Midlatitude and high-latitude electron density profiles in the ionosphere of Saturn obtained by Cassini radio occultation observations
Nagy, A. F.; Kliore, A. J.; Marouf, E. A. +4 more
Nineteen new radio occultations of the ionosphere of Saturn have been obtained since 2006. Sixteen of these occultations were from midlatitude and high latitudes and thus provided important, new information of the ionosphere for these regions. A high degree of variability in the electron densities were observed, but grouping and averaging the obse…
Mid- to Far-Infrared Emission and Star Formation in Early-Type Galaxies
Bendo, George J.; Young, Lisa M.; Lucero, Danielle M.
Many early-type galaxies have been detected at wavelengths of 24-160 µm but the emission is usually dominated by heating from an active galactic nucleus or from the evolved stellar population. Here, we present Spitzer MIPS observations of a sample of elliptical and lenticular galaxies that are rich in cold molecular gas, and we investigate w…
Ultra-long-period Oscillations in EUV Filaments Near to Eruption: Two-wavelength Correlation and Seismology
Foullon, C.; Nakariakov, V. M.; Verwichte, E.
We investigate whether or not ultra-long-period oscillations in EUV filaments can be related to their eruption. We report new observations of long-period (~10-30 hr) oscillatory motions in an apparently quiescent filament, as it crosses the solar disk in a 12 minute cadence SOHO/Extreme-Ultraviolet Imaging Telescope (EIT) 195 Å uninterrupted data …
Rate and nature of false positives in the CoRoT exoplanet search
Mazeh, T.; Aigrain, S.; Zucker, S. +47 more
Context: The CoRoT satellite searches for planets by applying the transit method, monitoring up to 12 000 stars in the galactic plane for 150 days in each observing run. This search is contaminated by a large fraction of false positives, caused by different eclipsing binary configurations that might be confused with a transiting planet.
Aims: …
The Connection Between a Lyman Limit System, a Very Strong O VI Absorber, and Galaxies at z ~ 0.203
Lehner, N.; Prochaska, J. X.; Kobulnicky, H. A. +4 more
With a column density log N(O VI) = 14.95 ± 0.05, the O VI absorber at z abs sime 0.2028 observed toward the quasi-stellar object PKS 0312-77 (z em = 0.223) is the strongest yet detected at z < 0.5. At nearly identical redshift (z abs sime 0.2026), we also identify a Lyman limit system (LLS, log N(H I) = 18.22
Evidence for Mg-rich carbonates on Mars from a 3.9 µm absorption feature
Palomba, Ernesto; Zinzi, Angelo; Cloutis, Edward A. +3 more
The origin and nature of the early atmosphere of Mars is still debated. The discovery of sulfate deposits on the surface, coupled with the evidence that there are not large abundances of carbonates detectable on Mars in the optically accessible part of the regolith, leaves open different paleoclimatic evolutionary pathways. Even if carbonates are …
On the formation of massive galaxies: a simultaneous study of number density, size and intrinsic colour evolution in GOODS
Lisker, Thorsten; Kaviraj, Sugata; Pasquali, Anna +2 more
The evolution of number density, size and intrinsic colour is determined for a volume-limited sample of visually classified early-type galaxies selected from the Hubble Space Telescope/Advanced Camera for Surveys images of the Great Observatories Origins Deep Survey (GOODS) North and South fields (version 2). The sample comprises 457 galaxies over…
Abell 851 and the Role of Starbursts in Cluster Galaxy Evolution
Smail, Ian; Fritz, Jacopo; Dressler, Alan +5 more
We use extensive new observations of the very rich z ~ 0.4 cluster of galaxies A851 to examine the nature and origin of starburst galaxies in intermediate-redshift clusters. New HST observations, 24 µm Spitzer photometry and ground-based spectroscopy cover most of a region of the cluster about 10' across, corresponding to a cluster-centric r…
Benchmarking atomic data for astrophysics: Fe XVII EUV lines
Del Zanna, G.; Ishikawa, Y.
In the light of accurate structure and scattering calculations for Fe XVII, we review the status of identifications in the EUV spectrum of this ion using various experimental data, from the X-rays to the UV. Most previous identifications are confirmed, although a critical revision leads to changes in many wavelength values, in particular for the 2…
Hubble Space Telescope Morphologies of z ~ 2 Dust Obscured Galaxies. I. Power-Law Sources
Le Floc'h, E.; Armus, L.; Dey, Arjun +12 more
We present high-spatial resolution optical and near-infrared imaging obtained using the ACS, WFPC2, and NICMOS cameras aboard the Hubble Space Telescope of 31 24 µm bright z ≈ 2 Dust Obscured Galaxies (DOGs) identified in the Boötes Field of the NOAO Deep Wide-Field Survey. Although this subset of DOGs have mid-IR spectral energy distributio…