Search Publications
The solar type II radio bursts of 7 March 2012: Detailed simulation analyses
Cairns, Iver H.; Schmidt, J. M.; Lobzin, V. V.
Type II solar radio bursts are often indicators for impending space weather events at Earth. They are consequences of shock waves driven by coronal mass ejections (CMEs) that move outward from the Sun. We simulate such type II radio bursts by combining elaborate three-dimensional (3-D) magnetohydrodynamic (MHD) predictions of realistic CMEs near t…
Optimized Herschel/PACS photometer observing and data reduction strategies for moving solar system targets
Hartogh, P.; Pál, A.; Lellouch, E. +10 more
The "TNOs are Cool!: A survey of the trans-Neptunian region" is a Herschel Open Time Key Program that aims to characterize planetary bodies at the outskirts of the Solar System using PACS and SPIRE data, mostly taken as scan-maps. In this paper we summarize our PACS data reduction scheme that uses a modified version of the standard pipeline for ba…
O I fluorescent line contamination in soft X-ray diffuse background obtained with Suzaku/XIS
Mitsuda, Kazuhisa; Yamasaki, Noriko Y.; Takei, Yoh +1 more
The quantitative measurement of O VII line intensity is a powerful method for understanding the soft X-ray diffuse background. By systematically analyzing the O VII line intensity in 145 high-latitude Suzaku/XIS observations, the flux of O I fluorescent line in the XIS spectrum, contaminating the O VII l…
Pulkovo catalog of relative positions and motions of visual double and multiple stars from photographic observations with the 26-inch refractor in 1960-2007
Kiselev, A. A.; Romanenko, L. G.; Kiyaeva, O. V. +7 more
The results of long-term, uniform, photographic observations of visual double and multiple stars obtained on the Pulkovo 26″ refractor are presented. Relative positions are calculated for 259 pairs of visual double stars in 194 systems, with the relative motions also computed for 127 pairs. Lower limits for the total masses of the systems for whic…
Optimal integrated abundances for chemical tagging of extragalactic globular clusters
Dotter, Aaron; Sakari, Charli M.; Shetrone, Matthew +2 more
High-resolution integrated light (IL) spectroscopy provides detailed abundances of distant globular clusters whose stars cannot be resolved. Abundance comparisons with other systems (e.g. for chemical tagging) require understanding the systematic offsets that can occur between clusters, such as those due to uncertainties in the underlying stellar …
Understanding the Unique Assembly History of Central Group Galaxies
Treu, Tommaso; Coccato, Lodovico; Leauthaud, Alexie +7 more
Central galaxies (CGs) in massive halos live in unique environments with formation histories closely linked to that of the host halo. In local clusters, they have larger sizes (Re ) and lower velocity dispersions (σ) at fixed stellar mass M *, and much larger Re at a fixed σ than field and satellite galaxies (non-C…
Iapetus' near surface thermal emission modeled and constrained using Cassini RADAR Radiometer microwave observations
Lorenz, R. D.; Wye, L. C.; Janssen, M. A. +5 more
Since its arrival at Saturn, the Cassini spacecraft has had only a few opportunities to observe Iapetus, Saturn's most distant regular satellite. These observations were all made from long ranges (>100,000 km) except on September 10, 2007, during Cassini orbit 49, when the spacecraft encountered the two-toned moon during its closest flyby so fa…
3D-HST Emission Line Galaxies at z ~ 2: Discrepancies in the Optical/UV Star Formation Rates
Trump, Jonathan R.; Schneider, Donald P.; Gronwall, Caryl +6 more
We use Hubble Space Telescope near-IR grism spectroscopy to examine the Hβ line strengths of 260 star-forming galaxies in the redshift range 1.90 < z < 2.35. We show that at these epochs, the Hβ star formation rate (SFR) is a factor of ~1.8 higher than what would be expected from the systems' rest-frame UV flux density, suggesting a shift in…
A non-equilibrium ortho-to-para ratio of water in the Orion PDR
Bergin, E. A.; Plume, R.; van der Tak, F. F. S. +1 more
Context. The ortho-to-para ratio (OPR) of H2O is thought to be sensitive to the temperature of water formation. The OPR of H2O is thus useful for studying the formation mechanism of water.
Aims: We investigate the OPR of water in the Orion PDR (photon-dominated region), at the Orion Bar and Orion S positions, using data …
The X-Ray Properties of Five Galactic Supernova Remnants Detected by the Spitzer GLIMPSE Survey
Rho, Jeonghee; Heinke, Craig O.; Pannuti, Thomas G. +1 more
We present a study of the X-ray properties of five Galactic supernova remnants (SNRs)—Kes 17 (G304.6+0.1), G311.5-0.3, G346.6-0.2, CTB 37A (G348.5+0.1), and G348.5-0.0—that were detected in the infrared by Reach et al. in an analysis of data from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) that was conducted by the Spitz…