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Jovian-like aurorae on Saturn
Bunce, Emma J.; Melin, Henrik; Miller, Steve +5 more
Planetary aurorae are formed by energetic charged particles streaming along the planet's magnetic field lines into the upper atmosphere from the surrounding space environment. Earth's main auroral oval is formed through interactions with the solar wind, whereas that at Jupiter is formed through interactions with plasma from the moon Io inside its …
A New FUSE Survey of Interstellar HD
Snow, Theodore P.; Destree, Joshua D.; Rachford, Brian L. +5 more
We have used archival FUSE data to complete a survey of interstellar HD in 41 lines of sight with a wide range of extinctions. This follow-up to an earlier survey was made to further assess the utility of HD as a cosmological probe; to analyze the HD formation process; and to see what trends with other interstellar properties were present in the d…
Off-Nuclear Star Formation and Obscured Activity in the Luminous Infrared Galaxy NGC 2623
Sanders, D. B.; Surace, J. A.; Armus, L. +13 more
New optical Hubble Space Telescope (HST), Spitzer Space Telescope, and XMM observations of the luminous infrared galaxy (LIRG) NGC 2623 are presented. This galaxy was observed as part of the Great Observatories All-sky LIRG Survey (GOALS). The prominent 3.2 kpc southern extension to the nucleus has been resolved by HST observations into ~100 star …
Complex structure within Saturn's infrared aurora
Drossart, Pierre; Dougherty, Michele K.; Bunce, Emma J. +14 more
The majority of planetary aurorae are produced by electrical currents flowing between the ionosphere and the magnetosphere which accelerate energetic charged particles that hit the upper atmosphere. At Saturn, these processes collisionally excite hydrogen, causing ultraviolet emission, and ionize the hydrogen, leading to H3+ …
GRB 070610: A Curious Galactic Transient
Cenko, S. B.; Campana, S.; Price, P. A. +23 more
GRB 070610 is a typical high-energy event with a duration of 5 s. Yet within the burst localization we detect a highly unusual X-ray and optical transient, Swift J195509.6+261406. We see high-amplitude X-ray and optical variability on very short timescales even at late times. Using near-infrared imaging assisted by a laser guide star and adaptive …
The Structure of the Local Interstellar Medium. V. Electron Densities
Redfield, Seth; Falcon, Ross E.
We present a comprehensive survey of C II* absorption detections toward stars within 100 pc in order to measure the distribution of electron densities present in the local interstellar medium (LISM). Using high spectral resolution observations obtained by GHRS and STIS on board HST, we searched for all detections of LISM C II* absorption. We ident…
Coronal Rotation at Solar Minimum from UV Observations
Giordano, S.; Mancuso, S.
The observations of the UVCS SOHO instrument from 1996 May to 1997 May have been analyzed to reconstruct intensity time series of the O VI 1032 Å and H I Lyα 1216 Å spectral lines at different coronal heliolatitudes from 1.5 to 3.0 R⊙ from Sun center. At solar minimum, some features persist for several rotations, thus allowing analysis …
1RXS J173021.5-055933: a cataclysmic variable with a fast-spinning magnetic white dwarf
Mukai, K.; Haberl, F.; Gänsicke, B. T. +8 more
Aims:We present the first X-ray observations with the XMM-Newton and INTEGRAL satellites of the recently discovered cataclysmic variable 1RXS J173021.5-055933, together with simultaneous UV and coordinated optical photometry aiming at characterising its broad-band temporal and spectral properties and classifying this system as a magnetic one.
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Young stars and brown dwarfs surrounding Alnilam (ɛ Orionis) and Mintaka (δ Orionis)
Caballero, J. A.; Solano, E.
Aims: We look for new regions to search for substellar objects.
Methods: Two circular areas, 45 arcmin-radius each, centred on the young massive star systems Alnilam and Mintaka in the Orion Belt, were explored. The regions are very young (less than 10 Ma), have low extinction, and are neighbours to σ Orionis (~3 Ma), a young open cluster very…
Capabilities of Philae, the Rosetta Lander
Biele, J.; Ulamec, S.
In situ (and sample return) space missions are the most promising tools to investigate the origin and evolution of comet nuclei. We present the instruments and investigations that will be performed with PHILAE (the ROSETTA Lander) on comet 67P Churyumov Gerasimenko, starting in November 2014, ten years after launch. The rationale and the performan…