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Search for Diffuse X-Rays from the Bow Shock Region of Runaway Star BD +43 3654 with Suzaku
Tashiro, Makoto S.; Terada, Yukikatsu; Kouzu, Tomomi +4 more
The bow shocks of runaway stars with strong stellar winds of over 2000 km s
Constraints on sterile neutrino dark matter from XMM-Newton observations of M33
Paolillo, M.; Longo, G.; Borriello, E. +2 more
Using archival XMM-Newton observations of the diffuse and unresolved components' emission in the inner disc of M33, we exclude the possible contribution from narrow line emission in the energy range 0.5-5 keV more intense than 10-6-10-5 erg s-1. Under the hypothesis that sterile neutrinos constitute the majority of…
Highly ionized collimated outflow from HE 0238-1904
Savage, B. D.; Narayanan, A.; Dewangan, G. C. +3 more
We present a detailed analysis of a highly ionized, multiphased and collimated outflowing gas detected through O V, O VI, Ne VIII and Mg X absorption associated with the QSO HE 0238-1904 (zem≃ 0.629). Based on the similarities in the absorption-line profiles and estimated covering fractions, we find that the O VI and Ne VIII absorption …
Early Ultraviolet Observations of a Type IIn Supernova (2007pk)
Brown, P. J.; Oates, S. R.; Holland, S. T. +6 more
We present some of the earliest UV observations of a Type IIn supernova (SN)—SN 2007pk, where UV and optical observations using Swift's Ultra-Violet/Optical Telescope began 3 days after discovery or ~5 days after shock breakout. The SN observations commence at approximately maximum light in the UV and u-band filters, suggesting that the UV light c…
A population of isolated hard X-ray sources near the supernova remnant Kes 69
Chen, Y.; Miceli, M.; Bocchino, F. +6 more
Recent X-ray observations of the supernova remnant (SNR) IC 443 interacting with molecular clouds detected a new population of hard X-ray sources related to the remnant itself, which has been proposed to be fast ejecta fragments propagating within the dense environment. Encouraged by these studies, we obtained a deep XMM-Newton observation of the …
A hybrid approach to cosmic microwave background lensing reconstruction from all-sky intensity maps
Perotto, L.; Plaszczynski, S.; Starck, J. -L. +1 more
On the basis of realistic simulations, we propose a hybrid method to reconstruct the lensing potential power spectrum, directly on Planck-like cosmic microwave background frequency maps. This involves the use of a large Galactic mask and the treatment of strong inhomogeneous noise. For ℓ ≲ 100, we show that a full-sky inpainting method, which was …
High-resolution spectroscopy and high-density monitoring in X-rays of novae
Ness, J. U.
The 21st century X-ray observatories XMM-Newton, Chandra, and Swift gave us completely new insights into the X-ray behaviour of nova outbursts. These new-generation X-ray observatories provide particularly high spectral resolution and high density in monitoring campaigns, simultaneously in X-rays and UV/optical. The entire evolution of several nov…
Preprocessing Magnetic Fields with Chromospheric Longitudinal Fields
Kusano, K.; Yamamoto, Tetsuya T.
Nonlinear force-free field (NLFFF) extrapolation is a powerful tool for the modeling of the magnetic field in the solar corona. However, since the photospheric magnetic field does not in general satisfy the force-free condition, some kind of processing is required to assimilate data into the model. In this paper, we report the results of new prepr…
Studying the asymmetry of the globular cluster population of NGC 4261
Zezas, A.; Wolter, A.; O'Sullivan, E. +5 more
We present an analysis of the globular cluster (GC) population of the elliptical galaxy NGC 4261 based on Hubble Space Telescope Wide Field Planetary Camera 2 data in the B, V and I bands. We study the spatial distribution of the GCs in order to probe the anisotropy in the azimuthal distribution of the discrete X-ray sources in the galaxy revealed…
Electron optical depths and temperatures of symbiotic nebulae from Thomson scattering
Skopal, A.; Sekeráš, M.
Symbiotic binaries are comprised of nebulae, whose densest portions have electron concentrations of 108-1012 cm-3 and extend to a few astronomical units. They are optically thick enough to cause a measurable effect of the scattering of photons on free electrons. In this paper, we model the extended wings of strong …