Search Publications
XMM-Newton and Optical Follow-up Observations of Three New Polars from the Sloan Digital Sky Survey
Brinkmann, J.; Szkody, Paula; Schmidt, Gary D. +7 more
We report follow-up XMM-Newton and optical observations of three new polars found in the Sloan Digital Sky Survey. Simple modeling of the X-ray spectra, and consideration of the details of the X-ray and optical light curves corroborate the polar nature of these three systems and provide further insights into their accretion characteristics. During…
Energetic particle observations from the Ulysses COSPIN instruments obtained during the October-November 2003 events
Dalla, S.; Kunow, H.; Heber, B. +7 more
We report comprehensive observations of solar energetic particle intensities at energies from 0.3 to >100 MeV made by the suite of six Ulysses COSPIN energetic charged particle instruments on the Ulysses spacecraft during the period of intense solar activity in October/November 2003. We also discuss observations of particle anisotropies in sele…
INTEGRAL and XMM-Newton observations of the low-luminosity and X-ray-rich burst GRB 040223
McGlynn, S.; McBreen, S.; Foley, S. +6 more
GRB 040223 was observed by INTEGRAL and XMM-Newton. GRB 040223 has a peak flux of (1.6 ±0.13)×10-8 ergs cm-2 s-1, a fluence of (4.4±0.4)×10-7 ergs cm-2 and a steep photon power law index of -2.3±0.2, in the energy range 20-200 keV. The steep spectrum implies it is an X-ray-rich GRB with emissi…
XMM-Newton Observations of Optically Selected Sloan Digital Sky Survey Clusters
Georgakakis, A.; Georgantopoulos, I.; Plionis, M. +1 more
We explore the X-ray properties of a subset of the optically selected Sloan Digital Sky Survey (SDSS) cluster sample of Goto et al. by analyzing seven public XMM-Newton pointings, with exposure times ranging from ~4 to 46 ks. There are in total 17 SDSS clusters out of which only eight are detected at X-ray wavelengths with f0.5-2keV>…
Whistlers observed by the Cluster spacecraft outside the plasmasphere
Gurnett, D. A.; Pickett, J. S.; Inan, U. S. +4 more
Lightning generated whistlers are ubiquitous within the plasmasphere at both high and low altitudes, and these waves propagate efficiently in both ducted and nonducted modes. On the other hand, in the magnetospheric region outside the plasmasphere, lightning-generated whistlers are commonly observed at low altitudes (up to ∼6000 km) but only rarel…
Colors of Luminous Bulges in Cluster MS 1054-03 and Field Galaxies at Redshifts z~0.83
Tran, Kim-Vy; Willmer, Christopher N. A.; Im, Myungshin +3 more
Using Hubble Space Telescope images, we separate the bulgelike (dubbed ``pbulge'') and disklike (``pdisk'') components of 71 galaxies in the rich cluster MS 1054-03 and of 21 in the field. Our key finding is that luminous pbulges are very red, with rest-frame U-B~0.45, while predicted colors are bluer by 0.20 mag. Moreover, these very red colors a…
Multiple Outbursts of a Cataclysmic Variable in the Globular Cluster M22
Sumi, T.; MOA Collaboration; Bond, I. A. +19 more
We present a 4 yr light curve of a cataclysmic variable in M22, based on an analysis of accumulated data from the Microlensing Observations in Astrophysics (MOA) microlensing survey. The position of the star coincides with that of a transient event observed by the Hubble Space Telescope (HST) in 1999, originally attributed to microlensing but late…
A serendipitous XMM-Newton observation of the intermediate polar WX Pyx
Schlegel, E. M.
We briefly describe a serendipitous observation of the little-studied intermediate polar WX Pyx using XMM-Newton. The X-ray spin period is 1557.3 s, confirming the optical period published in 1996. An orbital period of ~5.54 h is inferred from the separation of the spin-orbit sidelobe components. The soft and hard band spin-folded light curves are…
Poisson Recoding Of Solar Images For Enhanced Compression
Berghmans, David; Nicula, Bogdan; Hochedez, Jean-François
The amount of useful scientific data that a space-borne telescope produces is often limited by the available telemetry of the platform. General purpose image compression schemes are usually used to compress the image either lossy or losslessly. These schemes do not take into account the fact that pixel values of typical solar images are only known…
Auroral kilometric radiation and magnetosphere-ionosphere coupling process during magnetic storms
Misawa, H.; Tsuchiya, F.; Morioka, A. +8 more
This paper presents an investigation of a magnetosphere-ionosphere (M-I) coupling process during magnetic storms, using observations of auroral kilometric radiation (AKR) in the field-aligned acceleration region and plasma density variation in the plasma sheet. The main phase electron precipitation, which AKR does not accompany, was confirmed as n…