Search Publications
Search for Sc-K Line Emission from RX J0852.0-4622 Supernova Remnant with Suzaku
Petre, Robert; Terada, Yukikatsu; Bamba, Aya +6 more
We searched for evidence of line emission around 4keV from the northwestern rim of the supernova remnant RX J0852.0-4622 using Suzaku XIS data. Several papers have reported on the detection of an emission line around 4.1keV from this region of the sky. This line would arise from K-band fluorescence by 44Sc, the immediate decay product o…
The 3D velocity structure of the planetary nebula NGC 7009
Steffen, W.; Koning, N.; Espíndola, M. +1 more
In search for deviations from homologous expansion in planetary nebulae we present a 3D morphokinematical model of NGC 7009. The model has been constructed with Shape based on PV diagrams from the literature and HST images. We find that the data are consistent with a radial velocity field with increased gradient at high latitudes compared to the e…
Magnetic evolution of superactive regions. Complexity and potentially unstable magnetic discontinuities
Romano, P.; Zuccarello, F.; Giorgi, F. +1 more
Context: It is widely accepted that solar flares are manifestations of magnetic reconnection events taking place in the solar atmosphere. Several aspects of these events remain unclear, although many efforts have been devoted to the investigation of magnetic field configurations at flare occurrence sites.
Aims: In this work, we have studied th…
Super Star Clusters in SBS0335-052E
Schneider, Glenn; Kennicutt, Robert C.; Vanzi, Leonardo +3 more
As one of the lowest metallicity star-forming galaxies, with a nucleus of several super star clusters (SSCs), SBS0335-052E is the subject of substantial current study. We present new insights on this galaxy based on new and archival high spatial resolution NICMOS and attitude control system images. We provide new measurements and limits on the siz…
Titan at 3 microns: Newly identified spectral features and an improved analysis of haze opacity
Kim, Sang Joon; Geballe, Thomas R.; Courtin, Régis +3 more
We have reanalyzed the high-resolution spectrum of Titan between 2.87 and 3.12 µm observed with NIRSPEC/Keck II on 2001 Nov. 21 in southern summer, using updated CH 3D and C 2H 6 line-by-line models. From new synthetic spectra, we identify all but a few of the previously unidentified significant absorption sp…
Major Solar Energetic Particle Events of Solar Cycles 22 and 23: Intensities Close to the Streaming Limit
Lario, D.; Aran, A.; Decker, R. B.
It has been argued that the highest intensities measured near 1 AU during large solar energetic particle events occur in association with the passage of interplanetary shocks driven by coronal mass ejections, whereas the intensities measured early in the events (known as the prompt component) are bounded by a maximum intensity plateau known as the…
New X-Ray Observations of the Old Nova CP Puppis and of the More Recent Nova V351 Puppis
Mukai, K.; de Martino, D.; Orio, M. +2 more
We present X-ray observations of the field containing Nova Puppis 1942 (CP Pup) and Nova Puppis 1991 (V351 Pup), done with ASCA in 1998, and with XMM-Newton in 2005. The X-ray and UV luminosity of CP Pup seem to have remained approximately constant since the last X-ray observations of the 1980s, while the optical luminosity has decreased. The X-ra…
Relative timing of substorm processes as derived from multifluid/multiscale simulations: Internally driven substorms
Winglee, R. M.; Harnett, E.; Kidder, A.
The role of tail reconnection in initiating substorm onset remains highly controversial. Multifluid/multiscale simulations are used to examine this problem with the unique capability of being able to resolve ion skin depth and ion cyclotron processes within a very thin tail current sheet within a global magnetosphere. It is shown that, consistent …
Emission and Absorption Properties of Low-Mass Type 2 Active Galaxies with XMM-Newton
Ho, Luis C.; Thornton, Carol E.; Barth, Aaron J. +1 more
We present XMM-Newton observations of four low-redshift Seyfert galaxies selected to have low host luminosities (Mg > - 20 mag) and small stellar velocity dispersions (σ* <45 km s-1), which are among the smallest stellar velocity dispersions found in any active galaxies. These galaxies show weak or no broad o…
Multi-spacecraft Observations of CIR-Associated Ion Increases During the Ulysses 2007 Ecliptic Crossing
Dresing, Nina; Heber, Bernd; Gómez-Herrero, Raúl +3 more
The period between 21 June and 8 October, 2007 (Carrington rotations 2058 to 2061), comprising the Ulysses ecliptic plane crossing, was characterized by low solar activity. Excluding the small solar energetic particle events observed during July, the ion increases observed in the inner heliosphere between 100 keV/n and 10 MeV/n were associated wit…