Search Publications
A Suzaku X-ray Study of the Particle Acceleration Processes in the Relativistic Jet of Blazar Mrk 421
Baring, Matthew G.; Krawczynski, Henric; Garson, Alfred B., III
We report on the findings of a 364 ks observation of the BL LAC object Mrk 421 with the X-ray observatory Suzaku. The analysis in this paper uses fluxes and hardness ratios (HRs) in the broad energy range from 0.5 keV to 30 keV. During the course of the observation, the 0.5-30 keV flux decreased by a factor of ~2 and was accompanied by several lar…
Cloud formation along mountain ridges on Titan
Barth, Erika L.
Cassini radar passes have shown a number of mountain ranges on Titan. Radar data covering approximately one quarter of Titan's surface places mountains in primarily equatorial regions with the mean height of about 900 m. The flow of air over topographic features can both trigger and enhance cloud formation. Orographically induced clouds near terre…
Molecular gas in NUclei of GAlaxies (NUGA) XIII. The interacting Seyfert 2/LINER galaxy NGC 5953
Hunt, L. K.; Schinnerer, E.; Combes, F. +5 more
We present 12CO(1-0) and 12CO(2-1) maps of the interacting Seyfert 2/LINER galaxy NGC 5953 obtained with the IRAM interferometer at resolutions of 2.1 arcsec × 1.4 arcsec and 1.1 arcsec × 0.7 arcsec, respectively. We also present single-dish IRAM 30 m observations of the central region of NGC 5953 for the 12CO(1-0)…
Subaru FOCAS Spectroscopic Observations of High-Redshift Supernovae
Wang, Lifan; Furusawa, Hisanori; Rubin, David +30 more
We present spectra of high-redshift supernovae (SNe) that were taken with the Subaru low-resolution optical spectrograph, FOCAS. These SNe were found in SN surveys with Suprime-Cam on Subaru, the CFH12k camera on the Canada-France-Hawaii Telescope, and the Advanced Camera for Surveys on the Hubble Space Telescope. These SN surveys specifically tar…
Far ultraviolet spectral properties of Saturn’s rings from Cassini UVIS
Colwell, Joshua E.; Cuzzi, Jeffrey N.; Esposito, Larry W. +3 more
Spectra taken by the Cassini Ultraviolet Imaging Spectrograph (UVIS) of Saturn’s C ring, B ring, Cassini Division, and A ring have been analyzed in order to characterize ring particle surface properties and water ice abundance in the rings. UVIS spectra sense the outer few microns of the ring particles. Spectra of the normalized reflectance (I/F) …
Potential structure around the Cassini spacecraft near the orbit of Enceladus
Miloch, W. J.; Olson, J.; Ratynskaia, S. +1 more
We present the results of numerical simulations of the potential structure around an object in a streaming plasma with parameters relevant for the Cassini spacecraft passing through Saturn's plasma disk near the orbit of Enceladus. Two- and three-dimensional particle-in-cell codes have been used allowing the potential of the simulated spacecraft b…
XMM-Newton X-ray Observation of the High-magnetic-field Radio Pulsar PSR J1734-3333
Kramer, M.; Lyne, A. G.; Kaspi, V. M. +1 more
Using observations made with the XMM-Newton Observatory, we report the probable X-ray detection of the high-magnetic-field radio pulsar PSR J1734-3333. This pulsar has an inferred surface dipole magnetic field of B = 5.2 × 1013 G, just below that of one anomalous X-ray pulsar. We find that the pulsar has an absorbed 0.5-2.0 keV flux of …
An iterative method in a probabilistic approach to the spectral inverse problem. Differential emission measure from line spectra and broadband data
Parenti, S.; Reale, F.; Hochedez, J. -F. +3 more
Context. Inverse problems are of great importance in astrophysics, e.g., for deriving information about the physical characteristics of hot optically thin plasma sources from their extreme ultraviolet and X-ray spectra.
Aims: We describe and test an iterative method developed within the framework of a probabilistic approach to the spectral in…
Large-scale Soft X-ray Loops and Their Magnetic Chirality in Both Hemispheres
Zhang, Hongqi; Gao, Yu; Su, Jiangtao +3 more
The magnetic chirality in the solar atmosphere has been studied based on soft X-ray and magnetic field observations. It is found that some of the large-scale twisted soft X-ray loop systems occur for several months in the solar atmosphere, before the disappearance of the corresponding background large-scale magnetic field. This paper provides obse…
Quasi-periodic outflows observed by the X-Ray Telescope onboard Hinode in the boundary of an active region
Tian, Hui; Guo, Li-Jia; He, Jian-Sen
Persistent outflows have recently been detected at the boundaries of some active regions. Although these outflows are suggested to be possible sources of the slow solar wind, the nature of these outflows is poorly understood. Through an analysis of an image sequence obtained by the X-Ray Telescope onboard the Hinode spacecraft, we found that quasi…