Search Publications
New deep XMM-Newton observations to the west of the σ Orionis cluster
Caballero, J. A.; López-Santiago, J.
Aims: The objective of this study is to determine the general X-ray properties of the young stars in the external regions of the σ Orionis cluster (τ ~ 3 Ma, d ~ 385 pc) and determine constraints on the X-ray emission of brown dwarfs.
Methods: We carried out a careful analysis of public data obtained from an unexplored region to the west of th…
Doppler imaging an X-ray flare on the ultrafast rotator BO Mic. A contemporaneous multiwavelength study using XMM-Newton and VLT
Schmitt, J. H. M. M.; Wolter, U.; Robrade, J. +1 more
We present an analysis of contemporaneous photospheric, chromospheric and coronal structures on the
highly active K-dwarf star BO Mic (Speedy Mic). We concentrate on a moderate flare that we localize in the stellar atmosphere and study its energetics, size and thermal behavior. The analysis is based on strictly simultaneous X-r…Swift captures the spectrally evolving prompt emission of GRB070616
Page, M. J.; Norris, J. P.; O'Brien, P. T. +14 more
The origins of gamma-ray burst (GRB) prompt emission are currently not well understood and in this context long, well-observed events are particularly important to study. We present the case of GRB070616, analysing the exceptionally long-duration multipeaked prompt emission, and later afterglow, captured by all the instruments on-board Swift and b…
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…