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The Cosmic Web and galaxy evolution around the most luminous X-ray cluster: RX J1347.5-1145
Finoguenov, A.; Böhringer, H.; Hildebrandt, H. +5 more
In this paper we study large-scale structures and their galaxy content around the most X-ray luminous cluster known, RX J1347.5-1145 at z= 0.45. We make use of u*g'r'i'z' Canada-France-Hawaii Telescope (CFHT) MegaCam photometry together with VIsible MultiObject Spectrograph (VIMOS) Very Large Telescope (VLT) spectroscopy to identify structures aro…
The surface energy balance at the Huygens landing site and the moist surface conditions on Titan
McKay, Christopher P.; Williams, Kaj E.; Persson, Fredrik
The Huygens Probe provided a wealth of data concerning the atmosphere of Titan. It also provided tantalizing evidence of a small amount of surface liquid. We have developed a detailed surface energy balance for the Probe landing site. We find that the daily averaged non-radiative fluxes at the surface are 0.7 W m-2, much larger than the…
Polycyclic Aromatic Hydrocarbon Processing in the Blast Wave of the Supernova Remnant N132D
Rho, J.; Boersma, C.; Tappe, A. +1 more
We present Spitzer Infrared Spectrograph 14-36 µm mapping observations of the supernova remnant N132D in the Large Magellanic Cloud. This study focuses on the processing of polycyclic aromatic hydrocarbons (PAHs) that we previously identified in the southern blast wave. The mid-infrared spectra show strong continuum emission from shock-heate…
The Evolution and Environments of X-Ray Emitting Active Galactic Nuclei in High-redshift Large-scale Structures
Fassnacht, C. D.; Kocevski, D. D.; Lemaux, B. C. +5 more
We use deep Chandra imaging and an extensive optical spectroscopy campaign on the Keck 10 m telescopes to study the properties of X-ray point sources in two isolated X-ray-selected clusters, two superclusters, and one "supergroup" at redshifts of z ~ 0.7-0.9. We first study X-ray point sources using the statistical measure of cumulative source cou…
Radio-loud CMEs from the disk center lacking shocks at 1 AU
MacDowall, R. J.; Kaiser, M. L.; Gopalswamy, N. +4 more
A coronal mass ejection (CME) associated with a type II burst and originating close to the center of the solar disk typically results in a shock at Earth in 2-3 days and hence can be used to predict shock arrival at Earth. However, a significant fraction (about 28%) of such CMEs producing type II bursts were not associated with shocks at Earth. We…
Short large-amplitude magnetic structures (SLAMS) at Venus
Coates, A. J.; Barabash, S.; Zhang, T. L. +5 more
We present the first observation of magnetic fluctuations consistent with short large-amplitude magnetic structures (SLAMS) in the foreshock of the planet Venus. Three monolithic magnetic field spikes were observed by the Venus Express on 11 April 2009. The structures were ∼1.5-11 s in duration, had magnetic compression ratios between ∼3 and 6, an…
The Panchromatic Hubble Andromeda Treasury. II. Tracing the Inner M31 Halo with Blue Horizontal Branch Stars
Bell, Eric F.; Williams, Benjamin F.; Gilbert, Karoline M. +7 more
We attempt to constrain the shape of M31's inner stellar halo by tracing the surface density of blue horizontal branch (BHB) stars at galactocentric distances ranging from 2 kpc to 35 kpc. Our measurements make use of resolved stellar photometry from a section of the Panchromatic Hubble Andromeda Treasury survey, supplemented by several archival H…
On Signatures of Twisted Magnetic Flux Tube Emergence
van Driel-Gesztelyi, L.; Vargas Domínguez, S.; MacTaggart, D. +2 more
Recent studies of NOAA active region 10953, by Okamoto et al. (Astrophys. J. Lett.673, 215, 2008; Astrophys. J.697, 913, 2009), have interpreted photospheric observations of changing widths of the polarities and reversal of the horizontal magnetic field component as signatures of the emergence of a twisted flux tube within the active region and al…
Peak emission altitude of Saturn's H3+ aurora
Baines, Kevin H.; Brown, Robert H.; Melin, Henrik +3 more
Here we present the first detailed measurement of the altitudinal profile of H3+ emission within Saturn's ionosphere, made using images taken by the VIMS instrument on Cassini on 11-12 October 2006, during a chance alignment between the visible limb of the planet and the position of the main auroral emission. Using this, we s…
Flash Mixing on the White Dwarf Cooling Curve: Spectroscopic Confirmation in NGC 2808
Brown, Thomas M.; Hubeny, Ivan; Sweigart, Allen V. +3 more
We present new Hubble Space Telescope far-UV spectroscopy of two dozen hot evolved stars in NGC 2808, a massive globular cluster with a large population of "blue-hook" (BHk) stars. The BHk stars are found in ultraviolet color-magnitude diagrams of the most massive globular clusters, where they fall at luminosities immediately below the hot end of …