Search Publications
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…
Star Formation in LINER Host Galaxies at z ~ 0.3
Berta, Stefano; Pozzi, Francesca; Lutz, Dieter +8 more
We present the results of a Herschel-PACS study of a sample of 97 low-ionization nuclear emission-line regions (LINERs) at redshift z ~ 0.3 selected from the zCOSMOS survey. Of these sources, 34 are detected in at least one PACS band, enabling reliable estimates of the far-infrared L FIR luminosities, and a comparison to the FIR luminos…
Testing Gravitational Lensing as the Source of Enhanced Strong Mg II Absorption toward Gamma-Ray Bursts
Schmidt, Brian P.; Onken, Christopher A.; Tucker, Brad E. +3 more
Sixty percent of gamma-ray bursts (GRBs) reveal strong Mg II absorbing systems, which is a factor of ~2 times the rate seen along lines of sight to quasars. Previous studies argue that the discrepancy in the strong Mg II covering factor is most likely to be the result of either quasars being obscured due to dust or the consequence of many GRBs bei…
Far-infrared Imaging Observations of the Chamaeleon Region
Takita, Satoshi; Kaneda, Hidehiro; Kawamura, Akiko +4 more
We have carried out far-infrared imaging observations toward the Chamaeleon star-forming region by the Far-Infrared Surveyor (FIS) on board the AKARI satellite. The AKARI images cover a total area of 33.79 deg2, corresponding to 210 pc2 at the distance to the source. Using the FIS bands of 65-160 µm and the COBE/DIRBE b…
XMM-Newton Observations of Two Candidate Supernova Remnants
Pavlov, G. G.; Kargaltsev, O.; Misanovic, Z. +1 more
Candidate supernova remnants (SNRs) G23.5+0.1 and G25.5+0.0 were observed by XMM-Newton in the course of a snapshot survey of plerionic and composite SNRs in the Galactic plane. In the field of G23.5+0.1, we detected an extended source, ~3' in diameter, which we tentatively interpret as a pulsar wind nebula (PWN) of the middle-aged radio pulsar B1…
A Multi-spacecraft View of a Giant Filament Eruption during 2009 September 26/27
Gosain, Sanjay; Schmieder, Brigitte; Artzner, Guy +2 more
We analyze multi-spacecraft observations of a giant filament eruption that occurred during 2009 September 26 and 27. The filament eruption was associated with a relatively slow coronal mass ejection. The filament consisted of a large and a small part, and both parts erupted nearly simultaneously. Here we focus on the eruption associated with the l…