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Vertical abundance profiles of hydrocarbons in Titan's atmosphere at 15° S and 80° N retrieved from Cassini/CIRS spectra
Bézard, Bruno; Vinatier, Sandrine; Nixon, Conor A. +8 more
Limb spectra recorded by the Composite InfraRed Spectrometer (CIRS) on Cassini provide information on abundance vertical profiles of C 2H 2, C 2H 4, C 2H 6, CH 3C 2H, C 3H 8, C 4H 2, C 6H 6 and H…
Probing clumpy stellar winds with a neutron star
Walter, R.; Zurita Heras, J.
Context: INTEGRAL, the European Space Agency's γ-ray observatory, tripled the number of super-giant high-mass X-ray binaries (sgHMXB) known in the Galaxy by revealing absorbed and fast transient (SFXT) systems.
Aims: In these sources, quantitative constraints on the wind clumping of the massive stars could be obtained from the study of the har…
Dynamical modelling of luminous and dark matter in 17 Coma early-type galaxies
Saglia, R. P.; Thomas, D.; Thomas, J. +5 more
Dynamical models for 17 early-type galaxies in the Coma cluster are presented. The galaxy sample consists of flattened, rotating as well as non-rotating early-types including cD and S0 galaxies with luminosities between MB = -18.79 and -22.56. Kinematical long-slit observations cover at least the major-axis and minor-axis and extend to …
Evolution of the Frequency of Luminous (>=L*V) Close Galaxy Pairs at z < 1.2 in the COSMOS Field
Sanders, D. B.; Kartaltepe, J. S.; Murayama, T. +8 more
We measure the fraction of luminous galaxies in pairs at projected separations of 5-20 kpc out to z=1.2 in the Cosmic Evolution Survey (COSMOS) field using ACS images and photometric redshifts derived from an extensive multiwavelength data set. Analysis of a complete sample of 106,188 galaxies more luminous than MV=-19.8 (~L*…
The Bullet Cluster 1E0657-558 evidence shows modified gravity in the absence of dark matter
Brownstein, J. R.; Moffat, J. W.
A detailed analysis of the 2006 November 15 data release X-ray surface density Σ-map and the strong and weak gravitational lensing convergence κ-map for the Bullet Cluster 1E0657-558 is performed and the results are compared with the predictions of a modified gravity (MOG) and dark matter. Our surface density Σ-model is computed using a King β-mod…
X-ray emission from T Tauri stars and the role of accretion: inferences from the XMM-Newton extended survey of the Taurus molecular cloud
Audard, M.; Güdel, M.; Briggs, K. R. +2 more
Context: T Tau stars display different X-ray properties depending on whether they are accreting (classical T Tau stars; CTTS) or not (weak-line T Tau stars; WTTS). X-ray properties may provide insight into the accretion process between disk and stellar surface.
Aims: We use data from the XMM-Newton Extended Survey of the Taurus molecular cloud…
Star Cluster Demographics. I. A General Framework and Application to the Antennae Galaxies
Whitmore, Bradley C.; Fall, S. Michael; Chandar, Rupali
We present a framework for understanding the demographics of star cluster systems and develop a toy model that incorporates a universal initial power-law mass function, selected formation histories, selected disruption laws, and a convolution with common artifacts and selection effects found in observational data. A wide variety of observations ca…
Eruptions arising from tidally controlled periodic openings of rifts on Enceladus
Helfenstein, P.; Bills, B. G.; Hurford, T. A. +2 more
In 2005, plumes were detected near the south polar region of Enceladus, a small icy satellite of Saturn. Observations of the south pole revealed large rifts in the crust, informally called `tiger stripes', which exhibit higher temperatures than the surrounding terrain and are probably sources of the observed eruptions. Models of the ultimate inter…
The XMM-Newton Wide-Field Survey in the COSMOS Field. III. Optical Identification and Multiwavelength Properties of a Large Sample of X-Ray-Selected Sources
Finoguenov, A.; Taniguchi, Y.; Salvato, M. +31 more
We present the optical identification of a sample of 695 X-ray sources detected in the first 1.3 deg2 of the COSMOS XMM-Newton survey, down to a 0.5-2 keV (2-10 keV) limiting flux of ~10-15 erg cm-2 s-1 (~5×10-15 erg cm-2 s-1). In order to identify the correct optical cou…
The White Dwarf Cooling Sequence of NGC 6397
Anderson, Jay; Dotter, Aaron; Rich, R. Michael +10 more
We present the results of a deep Hubble Space Telescope (HST) exposure of the nearby globular cluster NGC 6397, focussing attention on the cluster's white dwarf cooling sequence. This sequence is shown to extend over 5 mag in depth, with an apparent cutoff at magnitude F814W~27.6. We demonstrate, using both artificial star tests and the detectabil…