Search Publications
Wide Companions to Hipparcos Stars within 67 pc of the Sun
Lépine, Sébastien; Tokovinin, Andrei
A catalog of common-proper-motion (CPM) companions to stars within 67 pc of the Sun is constructed based on the SUPERBLINK proper-motion survey. It contains 1392 CPM pairs with angular separations 30'' < ρ < 1800'', relative proper motion between the two components less than 25 mas yr-1, and magnitudes and colors of the secondarie…
Small-scale temperature fluctuations seen by the VeRa Radio Science Experiment on Venus Express
Pätzold, M.; Hinson, D. P.; Bird, M. K. +6 more
The Venus Express Radio Science Experiment VeRa retrieves atmospheric profiles in the mesosphere and troposphere of Venus in the approximate altitude range of 40-90 km. A data set of more than 500 profiles was retrieved between the orbit insertion of Venus Express in 2006 and the end of occultation season No. 11 in July 2011. The atmospheric profi…
Broadband Spectral Analysis of the Galactic Ridge X-Ray Emission
Makishima, Kazuo; Nakazawa, Kazuhiro; Yuasa, Takayuki
Detailed spectral analysis of the Galactic X-ray background emission, or the Galactic Ridge X-ray Emission (GRXE), is presented. To study the origin of the emission, broadband and high-quality GRXE spectra were produced from 18 pointing observations with Suzaku in the Galactic bulge region, with a total exposure of 1 Ms. The spectra were successfu…
Spatial distribution of rolled up Kelvin-Helmholtz vortices at Earth's dayside and flank magnetopause
Berchem, J.; Escoubet, C. P.; Eastwood, J. P. +21 more
The Kelvin-Helmholtz Instability (KHI) can drive waves at the magnetopause. These waves can grow to form rolled-up vortices and facilitate transfer of plasma into the magnetosphere. To investigate the persistence and frequency of such waves at the magnetopause we have carried out a survey of all Double Star 1 magnetopause crossings, using a combin…
Search for Gamma-ray Emission from X-Ray-selected Seyfert Galaxies with Fermi-LAT
Ozaki, M.; Troja, E.; Caraveo, P. A. +133 more
We report on a systematic investigation of the γ-ray properties of 120 hard X-ray-selected Seyfert galaxies classified as "radio-quiet" objects, utilizing the three-year accumulation of Fermi Large Area Telescope (LAT) data. Our sample of Seyfert galaxies is selected using the Swift Burst Alert Telescope 58 month catalog, restricting the analysis …
Ancient volcanism and its implication for thermal evolution of Mars
Huang, Jun; Xiao, Long; Greeley, Ronald +4 more
Volcanism plays an important role in the formation and thermal evolution of the crusts of all terrestrial planets. Martian volcanoes have been extensively studied, and it has been suggested that the volcanism on Mars that created the visible volcanic features was initiated in the Noachian (> 3.8 Ga) and continued to the Late Amazonian (< 0.1…
Tracing the Gas to the Virial Radius (R 100) in a Fossil Group
Humphrey, Philip J.; Buote, David A.; Brighenti, Fabrizio +3 more
We present a Chandra, Suzaku, and ROSAT study of the hot intragroup medium (IGrM) of the relaxed fossil group/poor cluster RX J1159+5531. This group exhibits an advantageous combination of flat surface brightness profile, high luminosity, and optimal distance, allowing the gas to be detected out to the virial radius (R vir≡ R 108
Analyzing Star Cluster Populations with Stochastic Models: The Hubble Space Telescope/Wide Field Camera 3 Sample of Clusters in M83
Whitmore, Bradley C.; Chandar, Rupali; Fouesneau, Morgan +1 more
The majority of clusters in the universe have masses well below 105 M ⊙. Hence, their integrated fluxes and colors can be affected by the presence or absence of a few bright stars introduced by stochastic sampling of the stellar mass function. Specific methods are being developed to extend the analysis of cluster energy distr…
Time-dependent MHD modeling of the global solar corona for year 2007: Driven by daily-updated magnetic field synoptic data
Liu, Yang; Wu, S. T.; Feng, X. S. +3 more
In this paper, we develop a time-dependent MHD model driven by the daily-updated synoptic magnetograms (MHD-DUSM) to study the dynamic evolution of the global corona with the help of the 3D Solar-Interplanetary (SIP) adaptive mesh refinement (AMR) space-time conservation element and solution element (CESE) MHD model (SIP-AMR-CESE MHD Model). To ac…
Discovery of a Be/X-ray pulsar binary and associated supernova remnant in the Wing of the Small Magellanic Cloud
Gruendl, R. A.; Gallagher, J. S., III; Chu, Y. -H. +6 more
We report on a new Be/X-ray pulsar binary located in the Wing of the Small Magellanic Cloud (SMC). The strong pulsed X-ray source was discovered with the Chandra and XMM-Newton X-ray observatories. The X-ray pulse period of 1062 s is consistently determined from both Chandra and XMM-Newton observations, revealing one of the slowest rotating X-ray …