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The quiescent spectral energy distribution of V404 Cyg
Fender, R. P.; Rupen, M.; Casares, J. +4 more
We present a multiwavelength study of the black hole X-ray binary V404 Cyg in quiescence, focusing upon the spectral energy distribution (SED). Radio, optical, ultraviolet (UV) and X-ray coverage is simultaneous. We supplement the SED with additional non-simultaneous data in the optical through infrared where necessary. The compiled SED is the mos…
Transit infrared spectroscopy of the hot Neptune around GJ 436 with the Hubble Space Telescope
Pont, F.; Knutson, H.; Gilliland, R. L. +2 more
The nearby transiting system GJ 436b offers a unique opportunity to probe the structure and atmosphere of an extrasolar `hot Neptune'. In this Letter, we present the main results of observations covering two transit events with the Near Infrared Camera and Multi Object Spectrograph (NICMOS) camera on the Hubble Space Telescope (HST). The data cons…
The stellar association around Gamma Velorum and its relationship with Vela OB2
Naylor, Tim; Jeffries, R. D.; Walter, F. M. +2 more
We present the results of a photometric BVI survey of 0.9deg2 around the Wolf-Rayet binary γ2 Vel and its early-type common proper motion companion γ1 Vel (together referred to as the γ Vel system). Several hundred pre-main-sequence (PMS) stars are identified and the youth of a subset of these is spectroscopically …
INTEGRAL/IBIS and Swift/XRT observations of hard cataclysmic variables
Bird, A. J.; Fiocchi, M.; Landi, R. +5 more
The analysis of the third INTEGRAL/Imager on Board Integral Satellite (IBIS) survey has revealed several new cataclysmic variables, most of which turned out to be intermediate polars, thus confirming that these objects are strong emitters in hard X-rays. Here, we present high-energy spectra of all 22 cataclysmic variables detected in the third IBI…
The evolution of the red sequence slope in massive galaxy clusters
Smith, G. P.; Wardlow, J. L.; Edge, A. C. +2 more
We investigate the evolution of the optical and near-infrared colour-magnitude relation in an homogeneous sample of massive clusters from z = 1 to the present epoch. By comparing deep Hubble Space Telescope Advanced Camera for Surveys imaging of X-ray selected MAssive Cluster Survey (MACS) clusters at z ~ 0.5 to the similarly selected Las Campanas…
The accretion disc in the quasar SDSS J0924+0219
Bate, N. F.; Floyd, David J. E.; Webster, R. L.
We present single-epoch multiwavelength optical-near-infrared observations of the `anomalous' lensed quasar SDSS J0924+0219, made using the Magellan 6.5-m Baade Telescope at Las Campanas Observatory, Chile. The data clearly resolve the anomalous bright image pair in the lensed system, and exhibit a strong decrease in the anomalous flux ratio with …
X-ray emission from the extended discs of spiral galaxies
Warwick, R. S.; Owen, R. A.
We present a study of the X-ray properties of a sample of six nearby late-type spiral galaxies based on XMM-Newton observations. Since our primary focus is on the linkage between X-ray emission and star formation in extended, extranuclear Galactic discs, we have selected galaxies with near face-on aspect and sufficient angular extent so as to be r…
X-ray observations of PSR B1259-63 near the 2007 periastron passage
Takahashi, T.; Uchiyama, Y.; Aharonian, F. +2 more
PSR B1259-63 is a 48-ms radio pulsar in a highly eccentric 3.4-yr orbit with a Be star SS 2883. Unpulsed γ-ray, X-ray and radio emission components are observed from the binary system. It is likely that the collision of the pulsar wind with the anisotropic wind of the Be star plays a crucial role in the generation of the observed non-thermal emiss…
The structures of distant galaxies - II. Diverse galaxy structures and local environments at z = 4-6 implications for early galaxy assembly
Conselice, Christopher J.; Arnold, Jessica
We present an analysis of the structures, sizes, star formation rates and local environmental properties of galaxies at z ~ 4-6 (τuniverse < 2 Gyr), utilizing deep Hubble Space Telescope imaging of the Hubble Ultra Deep Field. The galaxies we study are selected with the Lyman-break drop-out technique, using galaxies which are B-, V- …
The extended interacting wind structure of Eta Carinae
Weis, K.; Stahl, O.; Gull, T. R. +9 more
The highly eccentric binary system, η Car, provides clues to the transition of massive stars from hydrogen-burning via the CNO cycle to a helium-burning evolutionary state. The fast-moving wind of η Car B creates a cavity in η Car A's slower, but more massive, stellar wind, providing an in situ probe. The Hubble Space Telescope/Space Telescope Ima…