Search Publications
Suzaku Follow-Up Observation of the Activated Magnetar 1E 1547.0-5408
Enoto, Teruaki; Makishima, Kazuo; Nakazawa, Kazuhiro +4 more
A 20 GHz bright sample for δ > 72° - II. Multifrequency follow-up
Prandoni, I.; Ricci, R.; Massardi, M. +10 more
We present follow-up observations at 5, 8 and 30 GHz of the K-band Northern Wide Survey (KNoWS) 20 GHz Bright Sample, performed with the 32-m Medicina radio telescope and the 32-m Toruń radio telescope. The KNoWS sources were selected in the Northern Polar Cap (δ > 72°) and have a flux density limit S20 GHz = 115 mJy. We include NRAO…
Polarization of Saturn's moon Iapetus. III. Models of the bright and the dark sides
Muinonen, K.; Tozzi, G. P.; Boehnhardt, H. +4 more
Context. Like many other atmosphereless solar system bodies, Iapetus exhibits a phenomenon of negative polarization at small phase angles, which can be modeled using theoretical approaches that consider interaction of light with a complex medium.
Aims: To retrieve information on the nature of Iapetus' surface material, we carried out theoreti…
Spectral Variability of IRAS 18325-5926 and Constraints on the Geometry of the Scattering Medium
Misra, R.; Dewangan, G. C.; Tripathi, Shruti +3 more
We analyze Suzaku and XMM-Newton data of the highly variable Seyfert 2, IRAS 18325-5926. The spectra of the source are well modeled as a primary component described as an absorbed power law and a secondary power-law component which is consistent with being scattered emission from an on-axis extended highly ionized medium. We show that while the pr…
X-ray measurement of the elemental abundances at the outskirts of the Perseus cluster with Suzaku
Hayashida, K.; Tsunemi, H.; Ueda, S. +1 more
We report on the abundance of metals (Mg and Fe) in the intracluster medium (ICM) at the outskirts (0.2 r200-0.8 r200) of the Perseus cluster. The X-ray spectra were obtained in the Suzaku/XIS mapping observations of this region. We employ single temperature models to fit all the X-ray spectra. The ICM temperature smoothly de…
X-Ray Eclipse Diagnosis of the Evolving Mass Loss in the Recurrent Nova U Scorpii 2010
Ness, J. -U.; Tsujimoto, M.; Osborne, J. P. +4 more
We report the Suzaku detection of the earliest X-ray eclipse seen in the recurrent nova U Scorpii 2010. A target-of-opportunity observation 15 days after the outburst found a 27% ± 5% dimming in the 0.2-1.0 keV energy band at the predicted center of an eclipse. In comparison with the X-ray eclipse depths seen at two later epochs by XMM-Newton, the…
Distant galaxy clusters in a deep XMM-Newton field within the CFTHLS D4
Böhringer, H.; Rosati, P.; Takey, A. +15 more
Aims: The XMM-Newton distant cluster project (XDCP) aims at the identification of a well defined sample of X-ray selected clusters of galaxies at redshifts z ≥ 0.8. As part of this project, we analyse the deep XMM-Newton exposure covering one of the CFHTLS deep fields to quantify the cluster content. We validate the optical follow-up strategy…
CO J = 2-1 Emission from Evolved Stars in the Galactic Bulge
Meixner, M.; Patel, N. A.; Sargent, Benjamin A. +3 more
We observe a sample of eight evolved stars in the Galactic bulge in the CO J = 2-1 line using the Submillimeter Array with angular resolution of 1''-4''. These stars have been detected previously at infrared wavelengths, and several of them have OH maser emission. We detect CO J = 2-1 emission from three of the sources in the sample: OH 359.943 +0…
Effect of interchange instability on magnetic reconnection
Goldstein, M. L.; Lyatsky, W.
We present here the results of a study of interacting magnetic fields that involves a force normal to the reconnection layer. In the presence of such force, the reconnection layer becomes unstable to interchange disturbances. The interchange instability results in formation of tongues of heated plasma that leaves the reconnection layer through its…
A fast matching algorithm for sheared stellar samples: k-d match
Heyl, Jeremy S.
This paper presents new and efficient algorithms for matching stellar catalogues, where the transformation between the coordinate systems of the two catalogues is unknown and might include shearing. The discovery of a given object, whether a star or asterism, from a first catalogue in a second catalogue is logarithmic in time rather than polynomia…