Search Publications
A Multi-Wavelength Investigation of the Unidentified Gamma-Ray Source HESS J1708-410
Funk, Stefan; Hinton, Jim; Van Etten, Adam
We report on recent XMM-Newton observations, archival radio continuum and CO data, and spectral energy distribution (SED) modeling of the unidentified Galactic plane source HESS J1708-410. No significant extended X-ray emission is observed, and we place an upper limit of 3.2 × 10-13 erg cm-2 s-1 in the 2-4 keV rang…
Evidence of the radio-quiet hard X-ray precursor of the 13 December 2006 solar flare
Zimovets, I. V.; Struminsky, A. B.; Gros, M.
We report multi-wavelength investigation of the pre-impulsive phase of the 13 December 2006 X-class solar flare. We use hard X-ray data from the anticoincidence system of spectrometer onboard INTEGRAL (ACS) jointly with soft X-ray data from the GOES-12 and Hinode satellites. Radio data are from Nobeyama and Learmonth solar observatories and from t…
Magnetic helicity and active filament configuration
Poedts, S.; Romano, P.; Zuccarello, F. P. +2 more
Context: The role of magnetic helicity in active filament formation and destabilization is still under debate.
Aims: Although active filaments usually show a sigmoid shape and a twisted configuration before and during their eruption, it is unclear which mechanism leads to these topologies. In order to provide an observational contribution to c…
Water ice crystallinity and grain sizes on Dione
Brown, R. H.; Buratti, B. J.; Jaumann, R. +3 more
Saturn's satellite Dione is becoming an increasingly important object in the outer Solar System, as evidence for its current activity accumulates. Infrared observations of the surface can provide clues to the history of the body and currently active processes. Using data from the Cassini Visual and Infrared Mapping Spectrometer (VIMS), we perform …
Multiwavelength study of M33's giant HII regions NGC 588 and NGC 592
Drissen, Laurent; Úbeda, Leonardo
We present a detailed multiwavelength photometric study of giant HII regions NGC 592 and NGC 588 in the nearby small spiral galaxy M33. We use data taken with the Wide Field and Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST). We detect several massive stars in both ionizing clusters. Six Wolf-Rayet (WR) stars are known to exi…
High-Resolution Near-Infrared Images of the T Tauri Binary System XZ Tauri
Pyo, Tae-Soo; Tamura, Motohide; Hayashi, Masahiko +8 more
We present a high-resolution (∼0.1'' = 14AU) H-band image of XZ Tau, a 0.3''-separated classical T Tauri binary system, taken with the Coronagraphic Imager with Adaptive Optics (CIAO) on the Subaru Telescope. We found a scattered light nebula extending to ∼2.4'' from the secondary, XZ Tau S, in the northeast region of the binary. Its surface brigh…
Modelling of mirror mode structures as propagating slow magnetosonic solitons
Stasiewicz, K.; Cheng, C. Z.
Cluster measurements in the magnetosheath with spacecraft separations of 2000 km indicate that magnetic pulsations interpreted as mirror mode structures are not frozen in plasma flow, but do propagate with speeds of up to ~50 km/s. Properties of these pulsations are shown to be consistent with propagating slow magnetosonic solitons. By using nonli…
Cusp observations during a sequence of fast IMF BZ reversals
Pitout, F.; Davies, J. A.; Lockwood, M. +6 more
In recent years, a large number of papers have reported the response of the cusp to solar wind variations under conditions of northward or southward Interplanetary Magnetic Field (IMF) Z-component (BZ). These studies have shown the importance of both temporal and spatial factors in determining the extent and morphology of the cusp and t…
Clustering of Red Galaxies Around the z = 1.53 Quasar 3C 270.1
Wilkes, Belinda J.; Fazio, G. G.; Ashby, M. L. N. +6 more
In the paradigm of hierarchical galaxy formation, luminous radio galaxies mark mass assembly peaks that should contain clusters of galaxies. Observations of the z = 1.53 quasar 3C 270.1 with the Spitzer Space Telescope at 3.6-24 µm and with the 6.5 m MMT in the z' and Y bands allow the detection of potential cluster members via photometric r…
Suzaku Observations of SN 1987A
Haberl, Frank; Hasinger, Günther; Sturm, Richard +2 more
We report on Suzaku observations of SN1987A in the Large Magellanic Cloud, performed in 2005 November and 2006 June. The observations provide medium resolution X-ray spectra during the phase of the interaction between the supernova blast wave and the inner circumstellar ring. The Suzaku observations complement XMM-Newton and Chandra observations a…