Search Publications
A High Resolution View of the Jet Termination Shock in a Hot Spot of the Nearby Radio Galaxy Pictor A: Implications for X-Ray Models of Radio Galaxy Hot Spots
Bondi, M.; Brunetti, G.; Tingay, S. J. +1 more
Images made with the Very Long Baseline Array (VLBA) have resolved the region in a nearby (z = 0.035) radio galaxy, Pictor A, where the relativistic jet that originates at the nucleus terminates in an interaction with the intergalactic medium, a so-called radio galaxy hot spot. This image provides the highest spatial resolution view of such an obj…
Hyperdiffusion as a Mechanism for Solar Coronal Heating
Cranmer, S. R.; van Ballegooijen, A. A.
A theory for the heating of coronal magnetic flux ropes is developed. The dissipated magnetic energy has two distinct contributions: (1) energy injected into the corona as a result of granule-scale, random footpoint motions and (2) energy from the large-scale, nonpotential magnetic field of the flux rope. The second type of dissipation can be desc…
Study of near-Earth reconnection events with Cluster and Double Star
Sauvaud, J. -A.; Zhang, T. L.; Lucek, E. +12 more
Observations made by a unique constellation of Cluster (at 14-16 RE), TC2, Goes10, and LANL spacecraft (near 6.6 RE) have allowed us to study the details of three reconnection events in the middle of a thick plasma sheet with the reconnection X-line located unusually close to Earth (10-12 RE). We use mapping along …
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…