Search Publications
Suzaku Observations of the Outskirts of A1835: Deviation from Hydrostatic Equilibrium
Zhang, Y. -Y.; Finoguenov, A.; Sato, Kosuke +12 more
We present results of four-pointing Suzaku X-ray observations (total ~200 ks) of the intracluster medium (ICM) in the A1835 galaxy cluster (kT ~ 8 keV, z = 0.253) out to the virial radius (r vir ~ 2.9 Mpc) and beyond. Faint X-ray emission from the ICM out to r vir is detected. The temperature gradually decreases with radius f…
Three-dimensional Magnetohydrodynamic Modeling of Propagating Disturbances in Fan-like Coronal Loops
Ofman, Leon; Davila, Joseph M.; Wang, Tongjiang
Quasi-periodic propagating intensity disturbances (PDs) have been observed in large coronal loops in EUV images over a decade, and are widely accepted to be slow magnetosonic waves. However, spectroscopic observations from Hinode/EIS revealed their association with persistent coronal upflows, making this interpretation debatable. Motivated by the …
A long XMM-Newton observation of an extreme narrow-line Seyfert 1: PG 1244+026
Done, Chris; Ward, Martin; Jin, Chichuan +1 more
We explore the origin of the strong soft X-ray excess in narrow-line Seyfert 1 galaxies using spectral-timing information from a 120 ks XMM-Newton observation of PG 1244+026. Spectral fitting alone cannot distinguish between a true additional soft X-ray continuum component and strongly relativistically smeared reflection, but both models also requ…
Evidence from radial velocity measurements of a global electric field in Saturn's inner magnetosphere
Wilson, R. J.; Delamere, P. A.; Bagenal, F. +3 more
The presence of a convection pattern in the Saturnian inner magnetosphere was first observed in moon signatures that were displaced from their expected locations. A noon to midnight directed electric field can account for these positional offsets, and also can explain asymmetries found in plasma temperatures between the day and night sides. By ass…
Pulsed accretion in a variable protostar
Gutermuth, Robert; Muzerolle, James; Furlan, Elise +2 more
Periodic increases in luminosity arising from variable accretion rates have been predicted for some pre-main-sequence close binary stars as they grow from circumbinary disks. The phenomenon is known as pulsed accretion and can affect the orbital evolution and mass distribution of young binaries, as well as the potential for planet formation. Accre…
Spatially resolved images of dust belt(s) around the planet-hosting subgiant κ CrB
Crepp, Justin R.; Wyatt, Mark C.; Johnson, John A. +4 more
We present Herschel spatially resolved images of the debris disc orbiting the subgiant κ Coronae Borealis (κ CrB). Not only are these the first resolved images of a debris disc orbiting a subgiant, but κ CrB is a rare example of an intermediate mass star where a detailed study of the structure of the planetary system can be made, including both pl…
The W40 Region in the Gould Belt: An Embedded Cluster and H II Region at the Junction of Filaments
Bachiller, Rafael; Samal, M. R.; Ojha, D. K. +3 more
We present a multiwavelength study of the W40 star-forming region using infrared (IR) observations in the UKIRT JHK bands, Spitzer Infrared Array Camera bands, and Herschel PACS bands, 2.12 µm H2 narrowband imaging, and radio continuum observations from GMRT (610 and 1280 MHz), in a field of view (FoV) of ~34' × 40'. Archival Spit…
X-ray spectral variability of seven LINER nuclei with XMM-Newton and Chandra data
González-Martín, O.; Márquez, I.; Masegosa, J. +1 more
Context. One of the most distinctive features in active galactic nuclei (AGN) is the variability of their emission. Variability has been discovered at X-ray, UV, and radio frequencies on timescales from hours to years. Among the AGN family and according to theoretical studies, low-ionization nuclear emission line region (LINER) nuclei would be obj…
Mid- to far-infrared properties of star-forming galaxies and active galactic nuclei
Elbaz, D.; Morrison, G.; Helou, G. +19 more
We study the mid- to far-IR properties of a 24 µm-selected flux-limited sample (S24> 5 mJy) of 154 intermediate redshift (⟨ z ⟩ ~ 0.15), infrared luminous galaxies, drawn from the 5 Milli-Jansky Unbiased Spitzer Extragalactic Survey. By combining existing mid-IR spectroscopy and new Herschel SPIRE submm photometry from the Hers…
Multiple working hypotheses for the formation of compositional stratigraphy on Mars: Insights from the Mawrth Vallis region
Baldridge, A. M.; Michalski, Joseph R.; Cuadros, J. +1 more
A unique aspect of martian geology is the presence of similar compositional stratigraphy observed in many locations throughout the surface. Where the Al-rich and Fe/Mg-rich clay minerals occur together, aluminous clays typically overly layered ferromagnesian clays, possibly indicating that precipitation-driven leaching occurred in a warmer, wetter…