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Akari Far-Infrared All-Sky Survey Maps
Nakagawa, Takao; Doi, Yasuo; Takita, Satoshi +13 more
Far-infrared observations provide crucial data for the investigation and characterisation of the properties of dusty material in the Interstellar Medium (ISM), since most of its energy is emitted between ~100 and 200 um. We present the first all-sky image from a sensitive all-sky survey using the Japanese AKARI satellite, in the wavelength range 5…
Quasi-periodic frequency fluctuations observed during coronal radio sounding experiments 1991-2009
Pätzold, M.; Bird, M. K.; Efimov, A. I. +5 more
Coronal radio sounding experiments were carried out using the dual-frequency signals of the spacecraft Ulysses, Galileo, Mars Express, Venus Express, and Rosetta. The change in differential frequency recorded at the NASA and ESA ground stations, a quantity sensitive only to the plasma along the radio ray path from spacecraft to receiver, has been …
What is the true nature of blinkers?
Doyle, J. G.; Madjarska, M. S.; Bewsher, D. +1 more
Aims: The aim of this work is to identify the true nature of the transient EUV brightenings, called blinkers.
Methods: Co-spatial and co-temporal multi-instrument data, including imaging (EUVI/STEREO, XRT and SOT/Hinode), spectroscopic (CDS/SoHO and EIS/Hinode) and magnetogram (SOT/Hinode) data, of an isolated equatorial coronal hole wer…
Spectroscopic Follow-up of X-Ray Sources in the ChaMPlane Survey: Identification of a New Cataclysmic Variable
van den Berg, M.; Allen, B.; Servillat, M. +3 more
We present a multi-object optical spectroscopy follow-up study of X-ray sources in a field along the Galactic plane (l = 327fdg42, b = 2fdg26) which is part of the Chandra Multi-wavelength Plane survey (ChaMPlane). We obtained spectra for 46 stars, including 15 likely counterparts to X-ray sources, and sources showing an Hα color excess. This has …
Submillimetre source counts in the fields of high-redshift galaxy clusters
Gladders, M. D.; Ivison, R. J.; Hoekstra, H. +11 more
We present a submillimetre survey of seven high-redshift galaxy clusters (0.64 < z < 1.0) using the Submillimetre Common-User Bolometer Array (SCUBA) at 850 and 450 ?m. The targets, of similar richness and redshift, are selected from the Red-sequence Cluster Survey (RCS). We use this sample to investigate the apparent excess of submillimetre…
The Properties of Two Low-redshift O VI Absorbers and Their Associated Galaxies toward 3c 263
Savage, B. D.; Narayanan, A.; Wakker, B. P. +4 more
Ultraviolet observations of the QSO 3C 263 (z em = 0.652) with Cosmic Origins Spectrograph and FUSE reveal O VI absorption systems at z = 0.06342 and 0.14072. WIYN multi-object spectrograph observations provide information about the galaxies associated with the absorbers. The multi-phase system at z = 0.06342 traces cool photoionized ga…
Systematic Motion of Fine-scale Jets and Successive Reconnection in Solar Chromospheric Anemone Jet Observed with the Solar Optical Telescope/Hinode
Shibata, K.; Isobe, H.; Singh, K. A. P. +1 more
The Solar Optical Telescope (SOT) on board Hinode allows observations with high spatiotemporal resolution and stable image quality. A λ-shaped chromospheric anemone jet was observed in high resolution with SOT/Hinode. We found that several fine-scale jets were launched from one end of the footpoint to the other. These fine-scale jets (~1.5-2.5 Mm)…
The near-IR counterpart of IGR J17480-2446 in Terzan 5
D'Antona, F.; Ventura, P.; Papitto, A. +8 more
Context. Some globular clusters in our Galaxy are noticeably rich in low-mass X-ray binaries.
Aims: The detection and study of optical/IR counterparts of low-mass X-ray binaries is fundamental to characterizing b…
Temporal evolution and electric potential structure of the auroral acceleration region from multispacecraft measurements
Dandouras, I.; Lucek, E.; Fazakerley, A. N. +12 more
Bright aurorae can be excited by the acceleration of electrons into the atmosphere in violation of ideal magnetohydrodynamics. Modeling studies predict that the accelerating electric potential consists of electric double layers at the boundaries of an acceleration region but observations suggest that particle acceleration occurs throughout this re…
A multiwavelength study of the supernova remnant G296.8-0.3
Combi, J. A.; Martí, J.; Muñoz-Arjonilla, A. J. +3 more
We report XMM-Newton observations of the Galactic supernova remnant G296.8-0.3, together with complementary radio and infrared data. The spatial and spectral properties of the X-ray emission, detected towards G296.8-0.3, was investigated in order to explore the possible evolutionary scenarios and the physical connexion with its unusual morphology …