Search Publications
XMM-Newton Observations of Five INTEGRAL Sources Located Towards the Scutum Arm
Tomsick, J. A.; Rodriguez, J.; Bodaghee, A.
Results are presented for XMM-Newton observations of five hard X-ray sources discovered by INTEGRAL in the direction of the Scutum Arm. Each source received gsim20 ks of effective exposure time. We provide refined X-ray positions for all five targets enabling us to pinpoint the most likely counterpart in optical/infrared archives. Spectral and tim…
Extremely Rapid Star Cluster Disruption in High-shear Circumnuclear Starburst Rings: The Unusual Case of NGC 7742
de Grijs, Richard; Anders, Peter
All known mass distributions of recently formed star cluster populations resemble a "universal" power-law function. Here we assess the impact of the extremely disruptive environment in NGC 7742's circumnuclear starburst ring on the early evolution of the galaxy's high-mass (~105-107 M ⊙) star cluster population. Su…
Twist, Writhe, and Helicity in the Inner Penumbra of a Sunspot
Ruiz Cobo, B.; Puschmann, K. G.
The aim of this work is the determination of the twist, writhe, and self-magnetic helicity of penumbral filaments located in an inner sunspot penumbra. For this purpose, we inverted data taken with the spectropolarimeter on board Hinode with the SIR (Stokes Inversion based on Response function) code. For the construction of a three-dimensional geo…
The Discovery of an X-Ray/UV Stellar Flare from the Late-K/Early-M Dwarf LMC 335
Pun, C. S. J.; Kong, A. K. H.; Di Stefano, R. +2 more
We report the discovery of an X-ray/UV stellar flare from the source LMC 335, captured by XMM-Newton in the field of the Large Magellanic Cloud. The flare event was recorded continuously in X-ray for its first 10 hr from the precursor to the late decay phases. The observed fluxes increased by more than two orders of magnitude at its peak in X-ray …
UCAC3 Proper Motion Survey. II. Discovery of New Proper Motion Stars in UCAC3 with 0farcs40 yr-1 > µ >= 0farcs18 yr-1 between Declinations -47° and 00°
Henry, Todd J.; Finch, Charlie T.; Hambly, Nigel C. +2 more
We present 474 new proper motion stellar systems in the southern sky having no previously known components, with 0farcs40 yr-1 >µ >= 0farcs18 yr-1 between declinations -47° and 0°. In this second paper utilizing the U.S. Naval Observatory third CCD Astrograph Catalog (UCAC3) we complete our sweep of the southern s…
A New Ultraluminous X-Ray Source in the nearby Edge-on Spiral NGC 891
Bregman, Joel N.; Miller, Jon M.; Hodges-Kluck, Edmund J. +1 more
We report the discovery of a new candidate ultraluminous X-ray source in the nearby edge-on spiral galaxy NGC 891. The source, which has an absorbed flux of Fx ~ 1 × 10-12 erg s cm-2 (corresponding to an Lx >~ 1040 erg s-1 at 9 Mpc), must have begun its outburst in the past five …
The Arp 220 Merger on kpc Scales
Scharwächter, J.; König, S.; Eckart, A. +2 more
For the first time, we study the eastern nucleus in greater detail and search for the more extended emission in the molecular gas in different CO line transitions of the famous ultraluminous infrared galaxy (ULIRG) Arp 220. Furthermore, we present a model of the merger in Arp 220 on large scales with the help of the CO data and an optical and near…
Variations of the Muon Flux at Sea Level Associated with Interplanetary ICMEs and Corotating Interaction Regions
Miranda, P.; Ticona, R.; Velarde, A. +9 more
We present the results of an ongoing survey on the association between the muon flux variation at ground level (3 m above sea level) registered by the Tupi telescopes (Niteri-Brazil, 22fdg9S, 43fdg2W, 3 m) and the Earth-directed transient disturbances in the interplanetary medium propagating from the Sun (such as coronal mass ejections (CME), and …
PDS 144: The First Confirmed Herbig Ae-Herbig Ae Wide Binary
Holtzman, J. A.; Hamaguchi, K.; Grogin, N. A. +13 more
PDS 144 is a pair of Herbig Ae stars that are separated by 5farcs35 on the sky. It has previously been shown to have an A2Ve Herbig Ae star viewed at 83° inclination as its northern member and an A5Ve Herbig Ae star as its southern member. Direct imagery revealed a disk occulting PDS 144 N—the first edge-on disk observed around a Herbig Ae star. T…
Observations of Post-flare Plasma Dynamics during an M1.0 Flare in AR11093 by the Solar Dynamics Observatory/Atmospheric Imaging Assembly
Murawski, K.; Srivastava, Abhishek K.
We observe the motion of cool and hot plasma in a multi-stranded post-flare loop (PFL) system that evolved in the decay phase of a two-ribbon M1.0 class flare in AR 11093 on 2010 August 7 using the Solar Dynamics Observatory/Atmospheric Imaging Assembly 304 Å and 171 Å filters. The moving intensity feature and its reflected counterpart are observe…