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A Flare-Generated Shock during a Coronal Mass Ejection on 24 December 1996
Magdalenić, J.; Temmer, M.; Vršnak, B. +3 more
We present a multiwavelength study of the large-scale coronal disturbances associated with the CME - flare event recorded on 24 December 1996. The kinematics of the shock wave signature, the type II radio burst, is analyzed and compared with the flare evolution and the CME kinematics. We employ radio dynamic spectra, position of the Nançay Radiohe…
Emerging Massive Star Clusters Revealed: High-Resolution Imaging of NGC 4449 from the Radio to the Ultraviolet
Johnson, Kelsey E.; Reines, Amy E.; Goss, W. M.
We present a multi-wavelength study of embedded massive clusters in the nearby (3.9 Mpc) starburst galaxy NGC 4449 in an effort to uncover the earliest phases of massive cluster evolution. By combining high-resolution imaging from the radio to the ultraviolet, we reveal these clusters to be in the process of emerging from their gaseous and dusty b…
Characterizing the Low-Redshift Intergalactic Medium toward PKS 1302-102
Weiner, Benjamin J.; Chen, Hsiao-Wen; Mulchaey, John S. +2 more
We present a detailed analysis of the intergalactic metal-line absorption systems in the archival HST STIS and FUSE ultraviolet spectra of the low-redshift quasar PKS 1302-102 (zQSO = 0.2784). We supplement the archive data with CLOUDY ionization models and a survey of galaxies in the quasar field. There are 15 strong Lyα absorbers with…
Properties of the Galactic population of cataclysmic variables in hard X-rays
Sunyaev, R.; Krivonos, R.; Revnivtsev, M. +2 more
We measure the spatial distribution and hard X-ray luminosity function of cataclysmic variables (CVs) using the INTEGRAL all-sky survey in the 17-60 keV energy band. The vast majority of CVs detected by INTEGRAL are intermediate polars of luminosity in the range 1032-1034 erg s-1. The scale height of the Galactic d…
Solar Rotation Rate and Its Gradients During Cycle 23
Basu, Sarbani; Antia, H. M.; Chitre, S. M.
Available helioseismic data now span almost the entire solar activity cycle 23, making it possible to study solar-cycle-related changes of the solar rotation rate in detail. In this paper we study how the solar rotation rate, in particular, the zonal flows, change with time. In addition to the zonal flows that show a well-known pattern in the sola…
Observation and Modeling of the Solar-Cycle Variation of the Meridional Flow
Gizon, Laurent; Rempel, Matthias
We present independent observations of the solar-cycle variation of flows near the solar surface and at a depth of about 60 Mm, in the latitude range ± 45°. We show that the time-varying components of the meridional flow at these two depths have opposite sign, whereas the time-varying components of the zonal flow are in phase. This is in agreement…
Sources and losses of energetic protons in Saturn's magnetosphere
Krupp, N.; Jones, G. H.; Roussos, E. +7 more
We present Cassini data revealing that protons between a few keV and about 100 keV energy are not stably trapped in Saturn's inner magnetosphere. Instead these ions are present only for relatively short times following injections. Injected protons are lost principally because the neutral gas cloud converts these particles to energetic neutral atom…
Searching for Dark Matter with X-Ray Observations of Local Dwarf Galaxies
Profumo, S.; Jeltema, T. E.
A generic feature of weakly interacting massive particle (WIMP) dark matter models is the emission of photons over a broad energy band resulting from the stable yields of dark matter pair annihilation. Inverse Compton scattering off cosmic microwave background photons of energetic electrons and positrons produced in dark matter annihilation is exp…
Spectral variability of GX339-4 in a hard-to-soft state transition
Belloni, T.; Ubertini, P.; Malzac, J. +2 more
We report on INTEGRAL observations of the bright black hole transient GX339-4 performed during the period 2004 August-September, including the fast transition (10h) observed simultaneously with INTEGRAL and RXTE on August 15 and previously reported. Our data cover three different spectral states, namely hard/intermediate state (HIMS), soft/interme…
Intermediate long X-ray bursts from the ultra-compact binary candidate SLX 1737-282
Kuulkers, E.; Falanga, M.; Chenevez, J. +3 more
Aims: The low persistent flux X-ray burster source SLX 1737-282 is classified as an ultra-compact binary candidate. We compare the data on SLX 1737-282 with the other similar objects and attempt to derive constraints on the physical processes responsible for the formation of intermediate long bursts.
Methods: Up to now only four bursts, all wi…