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Plasma and fields in the wake of Rhea: 3-D hybrid simulation and comparison with Cassini data
Krupp, N.; Woch, J.; Fränz, M. +7 more
Rhea's magnetospheric interaction is simulated using a three-dimensional, hybrid plasma simulation code, where ions are treated as particles and electrons as a massless, charge-neutralizing fluid. In consistency with Cassini observations, Rhea is modeled as a plasma absorbing obstacle. This leads to the formation of a plasma wake (cavity) behind t…
A New Red Giant-based Distance Modulus of 13.3 Mpc to the Antennae Galaxies and Its Consequences
Rich, R. Michael; Saviane, Ivo; Da Costa, Gary S. +2 more
The Antennae galaxies are the closest example of an ongoing major galaxy merger and, as such, represent a unique laboratory for furthering the understanding of the formation of exotic objects (e.g., tidal dwarf galaxies, ultraluminous X-ray sources, super stellar clusters). In a previous paper HST WFPC2 observations were used to demonstrate that t…
Dynamical properties of a large young disk galaxy at z = 2.03
Wuyts, S.; Franx, M.; van der Werf, P. P. +3 more
Context: The study of high redshift Tully-Fisher relations (TFRs) is limited by the use of long slit spectrographs, rest frame B band and star formation selected galaxies.
Aims: We try to circumvent these issues by using integral field spectroscopy (SINFONI), by studying the rest frame K band and stellar mass TFR, and by selecting targets with…
Dynamics of Sunspot Light Bridges as Revealed by High-Resolution Images from Hinode
Venkatakrishnan, P.; Mathew, Shibu K.; Louis, Rohan E. +1 more
We present G-band and Ca II H filtergrams of two sunspot light bridges in NOAA AR 10953 taken from the 50-cm Solar Optical Telescope onboard the Japanese space satellite Hinode on 1 May 2007. The two light bridges differ in structure, with one of them resembling the filamentary penumbra and the other possessing a dark central lane running along th…
The Seyfert 1 Galaxy Mrk 335 at a very low flux state: mapping the soft X-ray photoionised gas
Guainazzi, M.; Santos-Lleo, M.; Nucita, A. +1 more
Context: This paper reports on an XMM-Newton observation of the Seyfert 1 Galaxy Mrk 335 performed as a target of opportunity when the source was in an unusually low flux state.
Aims: The low level of continuum emission unveiled an underlying line-rich soft X-ray spectrum, which can be studied with the Reflection Grating Spectrometer.
Meth…
Molecular Gas in the z = 1.2 Ultraluminous Merger GOODS J123634.53+621241.3
Dickinson, Mark; Chary, Ranga-Ram; Pope, Alexandra +14 more
We report the detection of CO(2→1) emission from the z = 1.2 ultraluminous infrared galaxy (ULIRG) GOODS J123634.53+621241.3 (also known as the submillimeter galaxy GN 26). These observations represent the first discovery of high-redshift CO emission using the new Combined Array for Research in Millimeter-Wave Astronomy (CARMA). Of all high-redshi…
Visible and near infrared spectroscopic investigation of E-type asteroids, including 2867 Steins, a target of the Rosetta mission
Barucci, M. A.; Fornasier, S.; Dotto, E. +1 more
We present the results of a visible spectroscopic survey of igneous asteroids belonging to the small and intriguing E-class, including 2867 Steins, a target of the Rosetta mission. The survey was carried out at the 3.5 m Telescopio Nazionale Galileo (TNG), and at the 3.5 m New Technology Telescope (NTT) of the European Southern Observatory. We obt…
γ-ray polarization constraints on Planck scale violations of special relativity
Ubertini, Pietro; Celotti, Annalisa; Maccione, Luca +2 more
Using recent polarimetric observations of the Crab Nebula in the hard X-ray band by INTEGRAL, we show that the absence of vacuum birefringence effects constrains O(E/M) Lorentz violation in QED to the level |ξ|<9×10-10 at 3σ CL, tightening by more than 3 orders of magnitude previous constraints. We show that planned X-ray polarimeter…
Long-Term Variability in the Optical Spectrum of the Seyfert Galaxy NGC 2992
Crenshaw, D. M.; Dietrich, M.; Trippe, M. L. +1 more
New spectra of NGC 2992 from the Cerro Tololo Inter-American Observatory show that this nearby active galactic nucleus changed its type classification to a Seyfert 2 in 2006. It was originally classified as a Seyfert 1.9, and has been previously seen as a Seyfert 1.5 with strong broad Hα emission. A comparison of the reddening and equivalent hydro…
The Radiometric and Pointing Calibration of SECCHI COR1 on STEREO
Thompson, W. T.; Reginald, N. L.
COR1 is the innermost coronagraph of the Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI) instrument suite aboard the twin Solar Terrestrial Relations Observatory (STEREO) spacecraft. The paired COR1 telescopes observe the white-light K-corona from 1.4 to 4 solar radii in a waveband 22.5 nm wide centered on the Hα line at 656 n…