Search Publications
Formation Epochs, Star Formation Histories, and Sizes of Massive Early-Type Galaxies in Cluster and Field Environments at z = 1.2: Insights from the Rest-Frame Ultraviolet
Ford, H. C.; Demarco, R.; Rosati, P. +7 more
We derive stellar masses, ages, and star formation histories (SFHs) of massive early-type galaxies in the z = 1.237 RDCS1252.9-2927 cluster and compare them with those measured in a similarly mass-selected sample of field contemporaries drawn from the Great Observatories Origin Deep Survey South Field. Robust estimates of these parameters are obta…
The writhe of helical structures in the solar corona
Török, T.; Kliem, B.; Berger, M. A.
Context. Helicity is a fundamental property of magnetic fields, conserved in ideal MHD. In flux rope geometry, it consists of twist and writhe helicity. Despite the common occurrence of helical structures in the solar atmosphere, little is known about how their shape relates to the writhe, which fraction of helicity is contained in writhe, and how…
The Evolution of the Ultraviolet Luminosity Function from z ~ 0.75 to z ~ 2.5 Using HST ERS WFC3/UVIS Observations
Trenti, M.; Oesch, P. A.; Carollo, C. M. +7 more
We present UV luminosity functions (LFs) at 1500 Å derived from the Hubble Space Telescope Early Release Science WFC3/UVIS data acquired over ~50 arcmin2 of the GOODS-South field. The LFs are determined over the entire redshift range z = 0.75-2.5 using two methods, similar to those used at higher redshifts for Lyman break galaxies (LBGs…
The Herschel first look at protostars in the Aquila rift
Prusti, T.; Olofsson, G.; Abergel, A. +40 more
As part of the science demonstration phase of the Herschel mission of the Gould Belt key program, the Aquila rift molecular complex has been observed. The complete ~ 3.3° × 3.3° imaging with SPIRE 250/350/500 µm and PACS 70/160 µm allows a deep investigation of embedded protostellar phases, probing of the dust emission from warm inner …
How the Enceladus dust plume feeds Saturn’s E ring
Schmidt, Jürgen; Kempf, Sascha; Beckmann, Uwe
Pre-Cassini models of Saturn's E ring [Horányi, M., Burns, J., Hamilton, D., 1992. Icarus 97, 248-259; Juhász, A., Horányi, M., 2002. J. Geophys. Res. 107, 1-10] failed to reproduce its peculiar vertical structure inferred from Earth-bound observations [de Pater, I., Martin, S.C., Showalter, M.R., 2004. Icarus 172, 446-454]. After the discovery of…
New Observational Constraints on the υ Andromedae System with Data from the Hubble Space Telescope and Hobby-Eberly Telescope
Butler, R. Paul; Benedict, G. Fritz; McArthur, Barbara E. +4 more
We have used high-cadence radial velocity (RV) measurements from the Hobby-Eberly Telescope with existing velocities from the Lick, Elodie, Harlan J. Smith, and Whipple 60'' telescopes combined with astrometric data from the Hubble Space Telescope Fine Guidance Sensors to refine the orbital parameters and determine the orbital inclinations and pos…
Dissecting the cosmic infra-red background with Herschel/PEP
Berta, S.; Magnelli, B.; Nordon, R. +34 more
The constituents of the cosmic IR background (CIB) are studied at its peak wavelengths (100 and 160 µm) by exploiting Herschel/PACS observations of the GOODS-N, Lockman Hole, and COSMOS fields in the PACS evolutionary probe (PEP) guaranteed-time survey. The GOODS-N data reach 3σ depths of ~3.0 mJy at 100 µm and ~5.7 mJy at 160 µm…
Impact craters on Titan
Cassini Radar Team; Wood, Charles A.; Lorenz, Ralph +4 more
Five certain impact craters and 44 additional nearly certain and probable ones have been identified on the 22% of Titan's surface imaged by Cassini's high-resolution radar through December 2007. The certain craters have morphologies similar to impact craters on rocky planets, as well as two with radar bright, jagged rims. The less certain craters …
The Herschel Virgo Cluster Survey. I. Luminosity function
Bomans, D. J.; Bianchi, S.; Fritz, J. +27 more
We describe the Herschel Virgo Cluster Survey (HeViCS) and the first data obtained as part of the science demonstration phase (SDP). The data cover a central 4×4 sq deg region of the cluster. We use SPIRE and PACS photometry data to produce 100, 160, 250, 350 and 500 µm luminosity functions (LFs) for optically bright galaxies that are select…
Quasi-periodic Propagating Signals in the Solar Corona: The Signature of Magnetoacoustic Waves or High-velocity Upflows?
De Pontieu, Bart; McIntosh, Scott W.
Since the discovery of quasi-periodic propagating oscillations with periods of order 3-10 minutes in coronal loops with TRACE and SOHO/EIT (and later with STEREO/EUVI and Hinode/EIS), they have been almost universally interpreted as evidence for propagating slow-mode magnetoacoustic waves in the low plasma β coronal environment. Here we show that …