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f-Mode Interactions with Thin Flux Tubes: The Scattering Matrix
Birch, A. C.; Hanasoge, S. M.; Gizon, L. +1 more
We calculate the scattering effects associated with the interaction of a surface gravity or f-mode with a thin magnetic flux tube embedded in a realistically stratified medium. We find that the dominant scattered wave is an f-mode with amplitude and phase of 1.17% and around 50° relative to the incident wave, compared to the values of 0.13% and 40…
The Schumann resonance: A tool for exploring the atmospheric environment and the subsurface of the planets and their satellites
López-Moreno, J. J.; Berthelier, J. -J.; Molina-Cuberos, G. J. +7 more
The propagation of extremely low frequency (ELF) electromagnetic waves and resonance phenomena in the Earth atmosphere has been extensively studied, in relation with ionospheric dynamics, and thunderstorm and lightning activities. A similar investigation can be performed for any other planet and satellite environment, provided this body is wrapped…
Titan's aerosols: Comparison between our model and DISR findings
Bar-Nun, A.; Dimitrov, V.; Tomasko, M.
Our model [Dimitrov, V., Bar-Nun, A., 1999. A model of energy dependent agglomeration of hydrocarbon aerosol particles and implication to Titan's aerosol. J. Aerosol. Sci. 30(1), 35-49] describes the experimentally found polymerization of C 2H 2 and HCN to form aerosol embryos, their growth and adherence to form various aeros…
A Pair of Leading Spiral Arms in a Luminous Infrared Galaxy?
Mattila, Seppo; Väisänen, Petri; Ryder, Stuart +1 more
Leading spiral arms are a rare phenomenon. We present here one of the very few convincing candidates of spiral arms opening counterintuitively in the same direction as the galaxy disk is rotating. This detection in the luminous IR galaxy (LIRG) IRAS 18293-3413 is based on near-infrared (NIR) adaptive optics imaging with the Very Large Telescope an…
The dynamical state of RX J1347.5-1145 from a combined strong lensing and X-ray analysis
Paolillo, M.; Sereno, M.; Miranda, M. +1 more
We perform a combined X-ray and strong lensing analysis of RX J1347.5-1145, one of the most luminous galaxy clusters at X-ray wavelengths. We show that evidence from strong lensing alone, based on published Very Large Telescope (VLT) and new Hubble Space Telescope (HST) data, strongly argues in favour of a complex structure. The analysis takes int…
INTEGRAL detection of the pulsar wind nebula in PSR J1846-0258
de Rosa, A.; Hill, A. B.; Bird, A. J. +6 more
Aims:We communicate the detection of soft (20-200 keV) γ-rays from the pulsar and pulsar wind nebula of PSR J1846-0258 and aim to identify the component of the system which is responsible for the γ-ray emission.
Methods: We combine spectral information from the INTEGRAL γ-ray mission with archival data from the Chandra X-ray Observatory to pin…
The Identification of New Stellar Groupings in the M81 Debris Field
Davidge, T. J.
The stellar content of the debris field around M81 is investigated using deep images obtained with MegaCam on the Canada-France-Hawaii Telescope. Three new concentrations of bright main-sequence stars and red supergiants are identified within ∼20 kpc of M81. These systems have integrated brightnesses MV ∼ -11 and surface brightnesses &m…
Near-infrared imaging polarimetry of young stellar objects in ρ Ophiuchi
Gledhill, T. M.; Lucas, P. W.; Beckford, A. F. +1 more
The results of a near-infrared (J H K LP) imaging linear polarimetry survey of 20 young stellar objects (YSOs) in ρ Ophiuchi are presented. The majority of the sources are unresolved, with K-band polarizations, PK < 6 per cent. Several objects are associated with extended reflection nebulae. These objects have centrosymmet…
Evidence for metallicity spreads in three massive M 31 globular clusters
Jablonka, P.; Sarajedini, A.; Meylan, G. +3 more
Aims: We quantify the intrinsic width of the red giant branches of three massive globular clusters in M 31 in a search for metallicity spreads within these objects.
Methods: We present HST/ACS observations of three massive clusters in M 31, G78, G213, and G280. A thorough description of the photometry extraction and calibration is presented. A…
High-resolution Enceladus atlas derived from Cassini-ISS images
Scholten, F.; Matz, K. -D.; Neukum, G. +8 more
The Cassini Imaging Science Subsystem (ISS) acquired 377 high-resolution images (<1 km/pixel) during three close flybys of Enceladus in 2005 [Porco, C.C., et al., 2006. Cassini observes the active south pole of Enceladus. Science 311, 1393-1401.]. We combined these images with lower resolution Cassini images and four others taken by Voyager cam…